Strategy Based Diagnosis
The goal of Strategy Based Diagnostics is to provide guidance when you create a plan of action for each specific diagnostic situation. Following a similar plan for each diagnostic situation, you will achieve maximum efficiency when you diagnose and repair vehicles. Although each of the Strategy Based Diagnostics boxes is numbered, you are not required to complete every box in order to successfully diagnose a customer concern. The first step of your diagnostic process should always be, verify the Customer Concern box. The final step of your diagnostic process should be Repair and verify the Fix box 7. Refer to the following chart for the correct Strategy Based Diagnostics.
Scheme 1
| Callout | Component Name |
|---|---|
| 1 | Verify the Customer Concern: The first part of this step is to obtain as much information as possible from the customer. Are there aftermarket accessories on the vehicle? When does the condition occur? Where does the condition occur? How long does the condition last? How often does the condition occur? In order to verify the concern, the technician should be familiar with the normal operation of the system and refer to the owner or service manual for any information needed. |
| 2 | Preliminary Checks: Conduct a thorough visual inspection. Review the service history. Detect unusual sounds or odors. Gather diagnostic trouble code (DTC) information in order to achieve an effective repair. |
| 3 | Perform Published Diagnostic System Check: The Diagnostic System Check verifies the proper operation of the system. This will lead the technician in an organized approach to diagnostics. |
| 4 | Check Bulletins, Recalls and Preliminary Information (PI)s. |
| 5.1 | Stored DTCs: Follow the designated DTC in order to make an effective repair. |
| 5.2 | Symptom No DTC: Select the appropriate symptom. Follow the diagnostic steps or suggestions in order to complete the repair. |
| 5.3 | No Published Diagnostics: Analyze the Concern. Develop a plan for the diagnostics. The service manual schematics will help you to see system power, ground, input and output circuits. You can also identify splices and other areas where multiple circuits are tied together. Look at component locations to see if components, connectors or harnesses may be exposed to extreme temperature, moisture, road salt or other corrosives battery acid, oil or other fluids. Utilize the wiring diagrams, system description and operation, and system circuit description. |
| 5.4 | Intermittents: An intermittent condition is one that does not occur continuously and will occur when certain conditions are met. Generally, intermittents are caused by faulty electrical connections and wiring, malfunctioning components, electromagnetic/radio frequency interference, and aftermarket equipment. Combine technician knowledge with efficient use of the available service information. Evaluate the symptoms and conditions described by the customer. Use a check sheet or other method in order to identify the component. Follow the suggestions for intermittent diagnosis found in the service manual. A scan tool and a digital multi-meter may have data capturing capabilities that can assist in detection of intermittents. |
| 5.5 | Vehicle Operates as Designed: This condition exists when the vehicle is found to operate normally. The condition described by the customer may be normal. Compare with another like vehicle that is operating normally under the same conditions described by the customer. Explain your findings and the operation of that system to the customer. |
| 6 | Re-examine the Concern: If a technician cannot successfully find or isolate the concern, a re-evaluation is necessary. Re-verify the concern. The concern could be an intermittent or normal condition. |
| 7 | Repair and Verify Fix: After isolating the cause, make the repairs and validate for the correct operation. Verify that the symptom has been corrected, which may involve road testing the vehicle. |
Diagnostic Procedure Instructions
The following is an overview of instructions for all 16 categories which may be included in a diagnostic procedure.
Diagnostic Instructions
A link to the Diagnostic System Check - Vehicle is provided here. This procedure should be performed prior to performing other diagnostic procedures, as this prevents misdiagnosis where there are integrated system dependencies.
A link to the Strategy Based Diagnosis is provided here. This provides an overview on how a technician should diagnose a vehicle.
A link to the Diagnostic Procedure Instructions is provided here. This information is an overview of instructions for all 16 categories which may be included in a diagnostic procedure.
DTC Descriptor
Describes what DTCs are diagnosed in this procedure. The DTC number, with Symptom Description when applicable, and descriptor are written out.
Diagnostic Fault Information
The diagnostic Fault Information table identifies each circuit that makes up an electrical subsystem and the associated circuit faults. DTCs and symptoms are listed in the table for all circuit fault modes. This information can be used to diagnose an electrical fault, or as a quick visual aid showing how the different symptoms and DTCs apply for the subsystem being diagnosed.
Even though all the DTCs and symptoms are shown in this table it does not mean they will all be diagnosed in the same procedure.
An example table from an engine coolant temperature (ECT) procedure
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| ECT Sensor Signal | P0117 | P0118 | P0118 | P0125 P0128 |
| ECT Low Reference | P0118 | P0118 | P0125 P0128 |
Diagnostic Procedure Instructions
Typical Scan Tool Data
The Typical Scan Tool Data table identifies a scan tool data parameter and its value in reference to potential circuit faults.
An example table from an ECT procedure
| Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
| Operating Conditions: Engine Running Parameter Normal Range: -32 to + 130°C (-26 to +275°F) | |||
| ECT Signal | 40°C (-40°F) | 140°C (284°F) | 40°C (-40°F) |
| Low Reference | 40°C (-40°F) | 40°C (-40°F) 1 | |
| 1 Internal ECM damage may occur if shorted to B+ | |||
ECT Sensor Temperature - PCM
Conditions for Running the DTC
Conditions for Running the DTC, identifies what conditions must be present to allow the diagnostic to run.
Conditions for Setting the DTC
Conditions for Setting the DTC, identifies the condition(s) that must be present in order to fail the diagnostic and when to set the DTC.
Action Taken When the DTC Sets
Actions Taken When the DTC sets, identifies the default actions taken when a control module sets a DTC.
Conditions for Clearing the DTC
Conditions for Clearing the DTC, identifies the conditions that must be met in order to clear the DTC.
Diagnostic Aids
Diagnostic Aids are suggestions which explain other methods to diagnose the condition. It also provides unique information about the system used to assist the technician in finding and repairing a vehicle condition.
Circuit/System Testing
The diagnostic format does not force a technician to any of the 3 diagnostic categories (Circuit/System Verification, Circuit/System Testing and Component Testing). However, beginning with the Circuit/System Verification category aids in determining if a vehicle condition is current.
Circuit/System Testing is a step by step, positive-flow, testing sequence which allows the technician to perform each test step, in sequence, until a fault is detected. If the result of a test step is achieved, the normal flow is to proceed to the next step. If the result is NOT achieved, the repair arrow bullet will identify what actions need to take place.
Intrusive diagnostics are performed to locate the system fault. System harness connections are disconnected from the module or component to test individual circuit functions. The module or component will be used to assist in verifying the circuit function. When a test does not pass, the repair steps will indicate what circuit faults to test. For example, short to voltage, short to ground or open/high resistance.
When testing for individual circuit faults, the technician is expected to include terminal inspections such as connection surfaces and terminal tension at both the harness and component/module. Additionally, a technician can use the links in Electrical Information Reference: Testing for Intermittent Conditions and Poor Connections or Circuit Testing .
The control modules and components will also be diagnosed during these test steps. A retest of a control module or component should always be performed before replacement. For example, re-connect all components and modules and retest the system to verify the condition still exists before replacing modules or components.
Component Testing
The diagnostic format does not force a technician to any of the 3 diagnostic categories (Circuit/System Verification, Circuit/System Testing and Component Testing). However, beginning with the Circuit/System Verification category aids in determining if a vehicle condition is current.
Component Testing can offer static and/or dynamic component tests. These tests can be used to verify if a component is operating correctly to avoid unnecessary replacement.
Testing modules in this category will not be offered. In most cases, the module is used to verify the harness circuits in the Circuit/System Testing category and a retest of the module should always be performed before replacement.
Diagnostic Starting Point - Vehicle
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information
- The identification of the control modules which are not communicating through the serial data circuit.
- The identification of any stored diagnostic trouble codes (DTCs) and their status.
The use of the Diagnostic System Check - Vehicle will identify the correct procedures to begin vehicle diagnosis. These must be performed before system DTC or symptom diagnosis.
Diagnostic System Check - Vehicle
- Before beginning vehicle diagnosis, the following preliminary inspections/tests must be performed: Ensure that the battery is fully charged. Refer to «Battery Inspection/Test»(ref-268108-S00563501072007101800000) . Ensure that the battery cables are clean and tight. Inspect for any open fuses. Refer to «Power Distribution Schematics»(ref-268084-S21447297012007101800000) and «Electrical Center Identification Views»(ref-268119-S21659504082007101800000) . Ensure that the grounds are clean, tight, and in the correct location. Refer to «Ground Distribution Schematics»(ref-268084-S08933508642007101800000) and «Power and Grounding Component Views»(ref-268119-S11301296662007101800000) . Inspect the easily accessible systems or the visible system components for obvious damage or conditions that could cause the concern. Inspect for aftermarket devices that could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-268113-S34470778152007101800000) . Search for applicable service bulletins. If the preceding inspections/tests resolve the concern, go to «Diagnostic Repair Verification»(ref-268112-S39062884462007101800000) .
- Install a scan tool. Verify that the scan tool powers up. If the scan tool does not power up, refer to «Scan Tool Does Not Power Up»(ref-268105-S26156625342007101800000) .
- Ignition ON, Engine OFF, verify communication with all of the control modules on the vehicle. Refer to «Data Link References»(ref-268105-S09251794812007101800000) for information on the modules you should expect to communicate. If the scan tool does not communicate with one or more of the expected control modules, refer to «Data Link References»(ref-268105-S09251794812007101800000) . IMPORTANT: Open the drivers door to ensure retained accessory power mode (RAP) is inactive during this test. The engine may start during this test. Turn the engine OFF as soon as the crank power mode has been observed.
- Access the Power Mode parameter on the scan tool. Verify the power mode parameter matches all the ignition switch positions. Refer to «Power Mode Description and Operation»(ref-268084-S22985897452007101800000) for information on the power mode states that correspond to each ignition switch position. If the power mode parameter does not match the ignition switch position for all ignition switch positions, refer to «Power Mode Mismatch»(ref-268113-S36935916912007101800000) .
- Attempt to start the engine. Verify that the engine cranks. If the engine does not crank, refer to «Symptoms - Engine Electrical»(ref-268108-S11615150212007101800000) .
- Attempt to start the engine. Verify the engine starts and idles. If the engine does not start and idle, refer to «Engine Cranks but Does Not Run»(ref-268125-S26898097902007101800000) for the 4.2L engine or «Engine Cranks but Does Not Run»(ref-268125-S26898097902007101800000) for the 5.3L engine. IMPORTANT: Do not clear any DTCs unless instructed to do so by a diagnostic procedure. IMPORTANT: If any DTCs are Powertrain related DTCs, select Capture Info in order to store the DTC information with the scan tool.
- Use the appropriate scan tool selections to obtain DTCs from each of the vehicle modules. Verify there are no DTCs reported from any module. If any DTCs are present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-268112-S07221794022007101800000) and diagnose any current DTCs in the following order: DTCs that begin with a U. Any of the following: B1000, B1001, B1004, B1007, B1009, B1017, C0240, C0550, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P060E, P062F, P1516, P1621, P2101, or P2610. Any of the following: B1372, B1375, P0562, or P0563. Component level DTCs. System level DTCs. Any remaining DTCs.
- If the customer concern is related to inspection/maintenance (I/M) testing, refer to «Inspection/Maintenance (I/M) System Check»(ref-268125-S04588496222007101800000) for the 4.2L engine or «Inspection/Maintenance (I/M) System Check»(ref-268137-S03419208402007101800000) for the 5.3L engine. If none of the previous tests or inspections addresses the concern, refer to «Symptoms - Vehicle»(ref-268112-S26614402562007101800000) .
Diagnostic Trouble Code (DTC) List - Vehicle
This master DTC list includes all applicable DTCs in alphanumeric order with descriptors.
| DTC | DTC Descriptor | Module That Sets the DTC | Diagnostic Procedure |
|---|---|---|---|
| If any DTCs are present, diagnose any current DTCs in the following order: DTCs that begin with a U. Any of the following: B1000, B1001, B1004, B1007, B1009, B1017, C0240, C0550, P0601, P0602, P0603, P0604, P0606, P0607, P060D, P060E, P062F, P1516, P1621, P2101, or P2610 Any of the following: B1372, B1375, P0562, or P0563 Component level DTCs System level DTCs Any remaining DTCs | |||
| B0012 | Passenger Frontal Deployment Loop Stage 2 Resistance Low | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0013 | Passenger Frontal Deployment Loop Stage 2 Open | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0014 | Passenger Frontal Deployment Loop Stage 2 Voltage Out of Range | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0016 | Passenger Frontal Deployment Loop Stage 1 Resistance Low | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0017 | Passenger Frontal Deployment Loop Stage 1 Open | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0018 | Passenger Frontal Deployment Loop Stage 1 Voltage Out of Range | SDM | DTC B0012, B0013, B0014, B0016, B0017, or B0018 |
| B0022 | Driver Frontal Deployment Loop Stage 1 Resistance Low | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0024 | Driver Frontal Deployment Loop Stage 1 Voltage Out of Range | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0026 | Driver Frontal Deployment Loop Stage 1 Open | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0042 | Driver Frontal Deployment Loop Stage 2 Resistance Low | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0043 | Driver Frontal Deployment Loop Stage 2 Voltage Out of Range | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0044 | Driver Frontal Deployment Loop Stage 2 Open | SDM | DTC B0022, B0024, B0026, B0042, B0043, or B0044 |
| B0051 | Deployment Commanded | SDM | DTC B0051 |
| B0053 | Deployment Commanded With Loop DTCs Present | SDM | DTC B0053 |
| B0057 | Passenger Pretensioner Deployment Loop Resistance Low | SDM | DTC B0057, B0058, or B0059 |
| B0058 | Passenger Pretensioner Deployment Loop Open | SDM | DTC B0057, B0058, or B0059 |
| B0059 | Passenger Pretensioner Deployment Loop Voltage Out of Range | SDM | DTC B0057, B0058, or B0059 |
| B0061 | Driver Roof Rail Deployment Loop Resistance Low | SDM | DTC B0061, B0062, or B0068 |
| B0062 | Driver Roof Rail Deployment Loop Open | SDM | DTC B0061, B0062, or B0068 |
| B0064 | Driver Pretensioner Deployment Loop Resistance Low | SDM | DTC B0064, B0065, or B0066 |
| B0065 | Driver Pretensioner Deployment Loop Open | SDM | DTC B0064, B0065, or B0066 |
| B0066 | Driver Pretensioner Deployment Loop Voltage Out of Range | SDM | DTC B0064, B0065, or B0066 |
| B0068 | Driver Roof Rail Deployment Loop Voltage Out of Range | SDM | DTC B0061, B0062, or B0068 |
| B0069 | Passenger Roof Rail Deployment Loop Resistance Low | SDM | DTC B0069, B0070, or B0071 |
| B0070 | Passenger Roof Rail Deployment Loop Open | SDM | DTC B0069, B0070, or B0071 |
| B0071 | Passenger Roof Rail Deployment Loop Voltage Out of Range | SDM | DTC B0069, B0070, or B0071 |
| B0077 | Driver Side Impact Sensor (SIS) Performance | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0078 | Passenger Side Impact Sensor (SIS) Performance | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0079 | Incorrect Driver Side Impact Sensor (SIS) Installed | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0080 | Discard Driver Side Impact Sensor (SIS) | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0081 | Incorrect Passenger Side Impact Sensor (SIS) Installed | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0082 | Discard Passenger Side Impact Sensor (SIS) | SDM | DTC B0077, B0078, B0079, B0080, B0081, or B0082 |
| B0083 | Passenger Seat Position Sensor Circuit | SDM | DTC B0083 or B0084 |
| B0084 | Driver Seat Position Sensor Circuit | SDM | DTC B0083 or B0084 |
| B0092 | Passenger Presence System Performance | SDM | DTC B0092 |
| B0098 | Passenger Presence System Configuration Error | SDM | DTC B0098 |
| B0100 | Electronic Front End Sensor 1 Performance | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0101 | Discard Electronic Front End Sensor 1 | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0102 | Incorrect Electronic Front End Sensor 1 Installed | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0103 | Electronic Front End Sensor 2 Performance | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0104 | Discard Electronic Front End Sensor 2 | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0105 | Incorrect Electronic Front End Sensor 2 Installed | SDM | DTC B0100, B0101, B0102, B0103, B0104, or B0105 |
| B0159 | Outside Air Temperature Sensor Circuit Range/Performance | HVAC Control Module | DTC B0159 or B0164 |
| B0164 | Passenger Compartment Temperature Sensor Circuit Range/Performance | HVAC Control Module | DTC B0159 or B0164 |
| B0174 | Output Air Temperature Sensor 1 Circuit Range/Performance | HVAC Control Module | DTC B0174, B0179, B0510, or B0515 |
| B0179 | Output Air Temperature Sensor 2 Circuit Range/Performance | HVAC Control Module | DTC B0174, B0179, B0510, or B0515 |
| B0183 | Solar Load Sensor 1 Circuit | HVAC Control Module | DTC B0183 or B0188 |
| B0188 | Solar Load Sensor 2 Circuit | HVAC Control Module | DTC B0183 or B0188 |
| B0229 | Recirculate Position Feedback Circuit Range/Performance | HVAC Control Module | DTC B0229, B0414, B0424, B3761, or B3770 |
| B0248 | Air Flow Control 3 Circuit | HVAC Control Module | DTC B0248, B0263, B0268, B0408, or B0418 |
| B0263 | Air Flow Control 6 Circuit | HVAC Control Module | DTC B0248, B0263, B0268, B0408, or B0418 |
| B0268 | Air Flow Control 7 Circuit | HVAC Control Module | DTC B0248, B0263, B0268, B0408, or B0418 |
| B0283 | Electric Rear Defrost Circuit | PLGM | DTC B0283 |
| B0408 | Temperature Control 1 Circuit | HVAC Control Module | DTC B0248, B0263, B0268, B0408, or B0418 |
| B0414 | Temperature Control 1 Feedback Circuit Range/Performance | HVAC Control Module | DTC B0229, B0414, B0424, B3761, or B3770 |
| B0418 | Temperature Control 2 Circuit | HVAC Control Module | DTC B0248, B0263, B0268, B0408, or B0418 |
| B0424 | Temperature Control 2 Feedback Circuit Range/Performance | HVAC Control Module | DTC B0229, B0414, B0424, B3761, or B3770 |
| B0510 | Output Air Temperature Sensor 3 Circuit Range/Performance | HVAC Control Module | DTC B0174, B0179, B0510, or B0515 |
| B0515 | Output Air Temperature Sensor 4 Circuit Range/Performance | HVAC Control Module | DTC B0174, B0179, B0510, or B0515 |
| B0540 | Speedometer Circuit | IPC | DTC B0540 |
| B0560 | Tachometer Circuit | IPC | DTC B0560 |
| B1000 | Electronic Control Unit (ECU) Performance | Audio Amplifier, BCM, DDM, DSM, DRR, DVD Player, HVAC, HVAC-Aux., PLGM, IPC, PDM, Radio, SDM, VCIM, VTD | DTC B1000 |
| B1001 | Option Configuration Error | SDM | DTC B1001 |
| VCIM | DTC B1001 | ||
| B1004 | Keep Alive Memory (KAM) Reset | VCIM | DTC B1004 |
| B1007 | EEPROM Write Error | VCIM, VTD | DTC B1007 |
| B1009 | EEPROM Checksum Mismatch | VCIM, VTD | DTC B1009 |
| B1017 | Output Driver Module Performance | DDM, PDM | DTC B1017 |
| PLGM | DTC B1017 or B3970 | ||
| B1023 | Integral Switch Performance | DDM, PDM | DTC B1023 |
| B1025 | Audio Output 1 Circuit | Radio | DTC B1025, B1035, B1045, or B1055 |
| B1035 | Audio Output 2 Circuit | Radio | DTC B1025, B1035, B1045, or B1055 |
| B1045 | Audio Output 3 Circuit | Radio | DTC B1025, B1035, B1045, or B1055 |
| B1055 | Audio Output 4 Circuit | Radio | DTC B1025, B1035, B1045, or B1055 |
| B1259 | Antenna Ground Circuit | DRR | DTC B1259 |
| B1271 | Theft Locked | Radio | DTC B1271 |
| B1372 | Device Ignition 1 Circuit Low | IPC | DTC B1372 |
| B1375 | Device Ignition 3 Circuit | HVAC Control Module | DTC B1375 |
| B1390 | Device Voltage Reference Input 1 Circuit | GBCM | DTC B1390 |
| B1397 | Device Voltage Reference Output Circuit Low | BCM | DTC B1397 or B2815 |
| B1440 | Power Mode Master Input Circuits Mismatch | BCM | DTC B1440 |
| B1477 | Retained Accessory Power Circuit Low | BCM | DTC B1477 |
| B1480 | Battery Rundown Protection Circuit | BCM | DTC B1480 |
| B1487 | Generator L-Terminal Circuit Low | GBCM | DTC B1487 |
| B1488 | Generator L-Terminal Circuit High | GBCM | DTC B1488 |
| B1492 | Generator F-Terminal Circuit Low | GBCM | DTC B1492 |
| B1516 | Battery Current Sensor Performance | GBCM | DTC B1516 |
| B1530 | Discard Passenger Presence System 1 | SDM | DTC B1530 |
| B1550 | Mirror Left Front or Right Front Select Switch Circuit | DDM | DTC B1550 |
| B1720 | Mirror Up and Down Control Switch Circuit | DDM | DTC B1720 |
| B1721 | Mirror Left and Right Control Switch Circuit | DDM | DTC B1721 |
| B1723 | Mirror Motor Control Circuit 1 Performance | DDM, PDM | DTC B1723 |
| B1724 | Mirror Motor Control Circuit 2 Performance | DDM, PDM | DTC B1724 |
| B1735 | Driver Seat Front Up Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1740 | Driver Seat Front Down Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1745 | Driver Seat Rear Up Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1750 | Driver Seat Rear Down Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1755 | Driver Seat Assembly Forward Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1760 | Driver Seat Assembly Rearward Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1815 | Driver Seat Recline Forward Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1820 | Driver Seat Recline Rearward Switch Circuit | DSM | DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820 |
| B1825 | Driver Seat Recline Position Sensor Circuit | DSM | DTC B1825, B1850, B1860, B2355, B2365, or B2375 |
| B1830 | Driver Seat Lumbar Forward Switch Circuit | DSM | DTC B1830, B1835, B1840 or B1845 |
| B1835 | Driver Seat Lumbar Rearward Switch Circuit | DSM | DTC B1830, B1835, B1840 or B1845 |
| B1850 | Driver Seat Lumbar Horizontal Position Sensor Circuit | DSM | DTC B1825, B1850, B1860, B2355, B2365, or B2375 |
| B2355 | Driver Seat Front Vertical Position Sensor Circuit | DSM | DTC B1825, B1850, B1860, B2355, B2365, or B2375 |
| B2365 | Driver Seat Rear Vertical Position Sensor Circuit | DSM | DTC B1825, B1850, B1860, B2355, B2365, or B2375 |
| B2375 | Driver Seat Horizontal Position Sensor Circuit | DSM | DTC B1825, B1850, B1860, B2355, B2365, or B2375 |
| B2425 | Driver Seat Heater Circuit | DSM | DTC B2425 or B2430 |
| B2430 | Passenger Seat Heater Circuit | DSM | DTC B2425 or B2430 |
| B2435 | Driver Seat Back Heater Sensor Circuit | DSM | DTC B2435 or B2440 |
| B2440 | Passenger Seat Back Heater Sensor Circuit | DSM | DTC B2435 or B2440 |
| B2455 | Cellular Phone Microphone Circuit Malfunction | VCIM | DTC B2455 |
| B2462 | Global Positioning System (GPS) Signal Error | Navigation Radio | DTC B2462 |
| B2470 | Cellular Phone Antenna Circuit Malfunction | VCIM | DTC B2470 |
| B2476 | Cellular Phone Select Service Switch Malfunction | VCIM | DTC B2476 |
| B2482 | Cellular Phone Select Switch Range/Performance | VCIM | DTC B2482 |
| B2483 | Global Positioning System (GPS) Sensor Circuit Low | VCIM | DTC B2483 or B2484 |
| B2484 | Global Positioning System (GPS) Sensor Circuit Open | VCIM | DTC B2483 or B2484 |
| B2527 | Front Fog Lamps Circuit Low | BCM | DTC B2527 |
| B2530 | Front Fog Lamps Control Circuit | BCM | DTC B2530 |
| B2550 | Backup Lamps Control Circuit | BCM | DTC B2550 |
| B2575 | Headlamp Control Circuit | BCM | DTC B2575 |
| B2580 | Headlamp High Beam Control Circuit | BCM | DTC B2580 |
| B2585 | Park Lamp Control Circuit | BCM | DTC B2585 |
| B2610 | Passenger Compartment Dimming 1 Circuit | BCM | DTC B2610 |
| B2615 | Passenger Compartment Dimming 2 Circuit | BCM | DTC B2615 |
| B2620 | Display Dimming Pulse Width Modulation (PWM) Input Circuit | BCM | DTC B2620 |
| B2625 | Display Dimming Pulse Width Modulation (PWM) Output Circuit | BCM | DTC B2625 |
| B2645 | Ambient Light Sensor Circuit | BCM | DTC B2645 |
| B2697 | Headlamp Washer Request Circuit | BCM | DTC B2697 |
| B2815 | Steering Wheel Controls Illegal Resistance Value | BCM | DTC B1397 or B2815 |
| B2947 | Security System Sensor Power Circuit Low | VTD | DTC B2947 |
| B2948 | Security System Sensor Power Circuit High | VTD | DTC B2948 |
| B2955 | Security System Sensor Data Circuit | VTD | DTC B2955 |
| B2960 | Security System Sensor Data Incorrect but Valid | VTD | DTC B2960 |
| B2961 | Key In Ignition Circuit | IPC | DTC B2961 |
| B3031 | Security System Controller In Learn Mode | VTD | DTC B3031 |
| B3055 | No Transponder Modulation or No Transponder | VTD | DTC B3055 |
| B3606 | Adjustable Foot Pedal Position Sensor Circuit | DSM | DTC B3606 |
| B3607 | Adjustable Foot Pedal Position Sensor Circuit | DSM | DTC B3607 |
| B3761 | Air Flow Control 3 Feedback Circuit | HVAC Control Module | DTC B0229, B0414, B0424, B3761, or B3770 |
| B3770 | Air Flow Control 6 Feedback Circuit | HVAC Control Module | DTC B0229, B0414, B0424, B3761, or B3770 |
| B3801 | Passenger Compartment Lamp Request Circuit | BCM | DTC B3801 |
| B3802 | Park Lamps Request Circuit | BCM | DTC B3802 |
| B3808 | Rear Door Lock Relay Circuit | BCM | DTC B3808 |
| B3809 | Rear Door Unlock Relay Circuit | BCM | DTC B3809 |
| B3810 | Headlamp Washer Relay Circuit | BCM | DTC B3810 or B3811 |
| B3811 | Rear Washer Relay Circuit | BCM | DTC B3810 or B3811 |
| B3819 | Left Rear Window Up Control Circuit | BCM | DTC B3819 |
| B3820 | Left Rear Window Down Control Circuit | BCM | DTC B3820 |
| B3821 | Left Rear Window Relay Power Circuit | BCM | DTC B3821 |
| B3822 | Right Rear Window Up Control Circuit | BCM | DTC B3822 |
| B3823 | Right Rear Window Down Control Circuit | BCM | DTC B3823 |
| B3824 | Right Rear Window Relay Power Circuit | BCM | DTC B3824 |
| B3855 | Rollover Sensor Performance | SDM | DTC B3855, B3856, or B3857 |
| B3856 | Discard Rollover Sensor | SDM | DTC B3855, B3856, or B3857 |
| B3857 | Incorrect Rollover Sensor Installed | SDM | DTC B3855, B3856, or B3857 |
| B3970 | Rear Wiper Motor Circuit | PLGM | DTC B1017 or B3970 |
| C0035 | Left Front Wheel Speed Sensor Circuit | EBCM | DTC C0035 or C0040 |
| C0040 | Right Front Wheel Speed Sensor Circuit | EBCM | DTC C0035 or C0040 |
| C0045 | Left Rear Wheel Speed Sensor Circuit | EBCM | DTC C0045 or C0050 |
| C0050 | Right Rear Wheel Speed Sensor Circuit | EBCM | DTC C0045 or C0050 |
| C0110 | Pump Motor Circuit | EBCM | DTC C0110 |
| C0131 | Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit | EBCM | DTC C0131 |
| C0161 | Antilock Brake System (ABS)/Traction Control System (TCS) Brake Switch | EBCM | DTC C0161 |
| C0186 | Lateral Accelerometer Circuit | EBCM | DTC C0186 |
| C0196 | Yaw Rate Circuit | EBCM | DTC C0196 |
| C0201 | Antilock Brake System (ABS) Enable Relay Contact Circuit | EBCM | DTC C0201 |
| C0240 | EBCM Malfunction | EBCM | DTC C0240 |
| C0241 | Pulse Width Modulated (PWM) Requested Torque | EBCM | DTC C0241 or P0856 |
| C0244 | Pulse Width Modulated (PWM) Delivered Torque | EBCM | DTC C0244 or P1689 (1) or DTC C0244 or P1689 (2) |
| C0245 | Wheel Speed Sensor Frequency Error | EBCM | DTC C0245 |
| C0267 | Low Brake Fluid Indicated | EBCM | DTC C0267 |
| C0283 | Mode Switch Circuit Malfunction | EBCM | DTC C0283 |
| C0287 | Longitudinal Accelerometer Circuit Malfunction | EBCM | DTC C0287 |
| C0292 | VSES Combination Sensor Circuits | EBCM | DTC C0292 |
| C0300 | Rear Speed Sensor Malfunction | TCSCM | DTC C0300 |
| C0305 | Front Speed Sensor Malfunction | TCSCM | DTC C0305 |
| C0306 | Motor A or B Circuit Malfunction | TCSCM | DTC C0306 |
| C0327 | Encoder Circuit Malfunction | TCSCM | DTC C0327 |
| C0374 | General System Malfunction | TCSCM | DTC C0374 |
| C0455 | Front Steering Position Sensor Circuit | EBCM | DTC C0455 |
| C0550 | Electronic Control Unit (ECU) Performance | EBCM | DTC C0550 |
| ECU Malfunction | TCSCM | DTC C0550 | |
| C0558 | Calibration Data Not Programmed | EBCM | DTC C0558 |
| C0750 | Left Front Low Tire Pressure Sensor | PLGM | DTC C0750, C0755, C0760, or C0765 |
| C0755 | Right Front Low Tire Pressure Sensor | PLGM | DTC C0750, C0755, C0760, or C0765 |
| C0760 | Left Rear Low Tire Pressure Sensor | PLGM | DTC C0750, C0755, C0760, or C0765 |
| C0765 | Right Rear Low Tire Pressure Sensor | PLGM | DTC C0750, C0755, C0760, or C0765 |
| C0775 | Low Tire Pressure System Sensors Not Programmed/Learned | PLGM | DTC C0775 |
| P0013 | Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit | PCM | DTC P0013 for the 4.2L engine |
| P0014 | Exhaust Camshaft Position (CMP) System Performance | PCM | DTC P0014 for the 4.2L engine |
| P0016 | Crankshaft Position (CKP) Intake Camshaft Position (CMP) Correlation | ECM | DTC P0016 for the 5.3L engine |
| P0017 | Crankshaft Position (CKP) Exhaust Camshaft Position (CMP) Correlation | PCM | DTC P0017 for the 4.2L engine |
| P0030 | HO2S Heater Control Circuit Sensor 1 | PCM | DTC P0030 or P0036 for the 4.2L engine |
| HO2S Heater Control Circuit Bank 1 Sensor 1 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0036 | HO2S Heater Control Circuit Sensor 2 | PCM | DTC P0030 or P0036 for the 4.2L engine |
| HO2S Heater Control Circuit Bank 1 Sensor 2 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0050 | HO2S Heater Control Circuit Bank 2 Sensor 1 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0053 | HO2S Heater Resistance Sensor 1 | PCM | DTC P0053 or P0054 for the 4.2L engine |
| HO2S Heater Resistance Bank 1 Sensor 1 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0054 | HO2S Heater Resistance Sensor 2 | PCM | DTC P0053 or P0054 for the 4.2L engine |
| HO2S Heater Resistance Bank 2 Sensor 2 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0056 | HO2S Heater Control Circuit Bank 2 Sensor 2 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0059 | HO2S Heater Resistance Bank 2 Sensor 1 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0060 | HO2S Heater Resistance Bank 2 Sensor 2 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0068 | Throttle Body Airflow Performance | ECM, PCM | DTC P0068 for the 4.2L engine or DTC P0068 or P0121 for the 5.3L engine |
| P0101 | Mass Air Flow (MAF) Sensor Performance | ECM, PCM | DTC P0101 or P1101 for the 4.2L engine or DTC P0101 or P1101 for the 5.3L engine |
| P0102 | Mass Air Flow (MAF) Sensor Circuit Low Frequency | ECM, PCM | DTC P0102 or P0103 for the 4.2L engine or DTC P0102 or P0103 for the 5.3L engine |
| P0103 | Mass Air Flow (MAF) Sensor Circuit High Frequency | ECM, PCM | DTC P0102 or P0103 for the 4.2L engine or DTC P0102 or P0103 for the 5.3L engine |
| P0106 | Manifold Absolute Pressure (MAP) Sensor Performance | ECM, PCM | DTC P0106 for the 4.2L engine or DTC P0106 for the 5.3L engine |
| P0107 | Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | ECM, PCM | DTC P0107 for the 4.2L engine or DTC P0107 or P0108 for the 5.3L engine |
| P0108 | Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage | ECM, PCM | DTC P0108 for the 4.2L engine or DTC P0107 or P0108 for the 5.3L engine |
| P0112 | Intake Air Temperature (IAT) Sensor Circuit Low Voltage | ECM, PCM | DTC P0112 for the 4.2L engine or DTC P0112 or P0113 for the 5.3L engine |
| P0113 | Intake Air Temperature (IAT) Sensor Circuit High Voltage | ECM, PCM | DTC P0113 for the 4.2L engine or DTC P0112 or P0113 for the 5.3L engine |
| P0116 | Engine Coolant Temperature (ECT) Sensor Performance | ECM, PCM | DTC P0116 for the 4.2L engine or DTC P0116 for the 5.3L engine |
| P0117 | Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage | ECM, PCM | DTC P0117 for the 4.2L engine or DTC P0117 or P0118 for the 5.3L engine |
| P0118 | Engine Coolant Temperature (ECT) Sensor Circuit High Voltage | ECM, PCM | DTC P0118 for the 4.2L engine or DTC P0117 or P0118 for the 5.3L engine |
| P0120 | Throttle Position (TP) Sensor 1 Circuit | ECM, PCM | DTC P0120 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0121 | Throttle Position (TP) Sensor 1 Performance | ECM, PCM | DTC P0121 for the 4.2L engine or DTC P0068 or P0121 for the 5.3L engine |
| P0122 | Throttle Position (TP) Sensor 1 Circuit Low Voltage | ECM, PCM | DTC P0122 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0123 | Throttle Position (TP) Sensor 1 Circuit High Voltage | ECM, PCM | DTC P0123 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0128 | Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature | ECM, PCM | DTC P0128 for the 4.2L engine or DTC P0128 for the 4.2L engine |
| P0131 | HO2S Circuit Low Voltage Sensor 1 | PCM | DTC P0131 for the 4.2L engine |
| HO2S Circuit Low Voltage Bank 1 Sensor 1 | ECM | DTC P0131, P0132, P0137, or P0138 for the 5.3L engine | |
| P0132 | HO2S Circuit High Voltage Sensor 1 | PCM | DTC P0132 for the 4.2L engine |
| HO2S Circuit High Voltage Bank 1 Sensor 1 | ECM | DTC P0131, P0132, P0137, or P0138 for the 5.3L engine | |
| P0133 | HO2S Slow Response Sensor 1 | PCM | DTC P0133 for the 4.2L engine |
| HO2S Slow Response Bank 1 Sensor 1 | ECM | DTC P0133, P0134, P0140, P1133, P2A00 or P2A01 for the 5.3L engine | |
| P0134 | HO2S Circuit Insufficient Activity Sensor 1 | PCM | DTC P0134 for the 4.2L engine |
| HO2S Circuit Insufficient Activity Bank 1 Sensor 1 | ECM | DTC P0133, P0134, P0140, P1133, P2A00 or P2A01 for the 5.3L engine | |
| P0135 | HO2S Heater Performance Sensor 1 | PCM | DTC P0135 or P0141 for the 4.2L engine |
| HO2S Heater Performance Bank 1 Sensor 1 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0136 | HO2S Circuit Sensor 2 | PCM | DTC P0136 for the 4.2L engine |
| P0137 | HO2S Circuit Low Voltage Sensor 2 | PCM | DTC P0137 for the 4.2L engine |
| HO2S Circuit Low Voltage Bank 1 Sensor 2 | ECM | DTC P0131, P0132, P0137, or P0138 for the 5.3L engine | |
| P0138 | HO2S Circuit High Voltage Sensor 2 | PCM | DTC P0138 for the 4.2L engine |
| HO2S Circuit High Voltage Bank 1 Sensor 2 | ECM | DTC P0131, P0132, P0137, or P0138 for the 5.3L engine | |
| P0140 | HO2S Circuit Insufficient Activity Sensor 2 | PCM | DTC P0140 for the 4.2L engine |
| HO2S Circuit Insufficient Activity Bank 1 Sensor 2 | ECM | DTC P0133, P0134, P0140, P1133, P2A00 or P2A01 for the 5.3L engine | |
| P0141 | HO2S Heater Performance Sensor 2 | PCM | DTC P0135 or P0141 for the 4.2L engine |
| HO2S Heater Performance Bank 1 Sensor 2 | ECM | DTC P0030, P0036, P0053, P0054, P0135, or P0141 for the 5.3L engine | |
| P0151 | HO2S Circuit Low Voltage Bank 2 Sensor 1 | ECM | DTC P0151, P0152, P0157, or P0158 for the 5.3L engine |
| P0152 | HO2S Circuit High Voltage Bank 2 Sensor 1 | ECM | DTC P0151, P0152, P0157, or P0158 for the 5.3L engine |
| P0153 | HO2S Slow Response Bank 2 Sensor 1 | ECM | DTC P0153, P0154, P0160, P1153, P2A03, or P2A04 for the 5.3L engine |
| P0154 | HO2S Circuit Insufficient Activity Bank 2 Sensor 1 | ECM | DTC P0153, P0154, P0160, P1153, P2A03, or P2A04 for the 5.3L engine |
| P0155 | HO2S Heater Performance Bank 2 Sensor 1 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0157 | HO2S Circuit Low Voltage Bank 2 Sensor 2 | ECM | DTC P0151, P0152, P0157, or P0158 for the 5.3L engine |
| P0158 | HO2S Circuit High Voltage Bank 2 Sensor 2 | ECM | DTC P0151, P0152, P0157, or P0158 for the 5.3L engine |
| P0160 | HO2S Circuit Insufficient Activity Bank 2 Sensor 2 | ECM | DTC P0153, P0154, P0160, P1153, P2A03, or P2A04 for the 5.3L engine |
| P0161 | HO2S Heater Performance Bank 2 Sensor 2 | ECM | DTC P0050, P0056, P0059, P0060, P0155, or P0161 for the 5.3L engine |
| P0171 | Fuel Trim System Lean | PCM | DTC P0171 for the 4.2L engine |
| Fuel Trim System Lean Bank 1 | ECM | DTC P0171, P0172, P0174, or P0175 for the 5.3L engine | |
| P0172 | Fuel Trim System Rich | PCM | DTC P0172 for the 4.2L engine |
| Fuel Trim System Rich Bank 1 | ECM | DTC P0171, P0172, P0174, or P0175 for the 5.3L engine | |
| P0174 | Fuel Trim System Lean Bank 2 | ECM | DTC P0171, P0172, P0174, or P0175 for the 5.3L engine |
| P0175 | Fuel Trim System Rich Bank 2 | ECM | DTC P0171, P0172, P0174, or P0175 for the 5.3L engine |
| P0201 | Injector 1 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0202 | Injector 2 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0203 | Injector 3 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0204 | Injector 4 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0205 | Injector 5 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0206 | Injector 6 Control Circuit | ECM, PCM | DTC P0201, P0202, P0203, P0204, P0205, or P0206 for the 4.2L engine or DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0207 | Injector 7 Control Circuit | ECM | DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0208 | Injector 8 Control Circuit | ECM | DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 for the 5.3L engine |
| P0218 | Transmission Fluid Overtemperature | PCM, TCM | DTC P0218 (4.2L) or DTC P0218 (5.3L) |
| P0220 | Throttle Position (TP) Sensor 2 Circuit | ECM, PCM | DTC P0220 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0222 | Throttle Position (TP) Sensor 2 Circuit Low Voltage | ECM, PCM | DTC P0222 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0223 | Throttle Position (TP) Sensor 2 Circuit High Voltage | ECM, PCM | DTC P0223 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P0230 | Fuel Pump Relay Control Circuit | ECM, PCM | DTC P0230 for the 4.2L engine or DTC P0230 for the 5.3L engine |
| P0300 | Engine Misfire Detected | ECM, PCM | DTC P0300 for the 4.2L engine or DTC P0300-P0308 for the 5.3L engine |
| P0301 | Cylinder 1 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0302 | Cylinder 2 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0303 | Cylinder 3 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0304 | Cylinder 4 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0305 | Cylinder 5 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0306 | Cylinder 6 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0307 | Cylinder 7 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0308 | Cylinder 8 Misfire Detected | ECM | DTC P0300-P0308 for the 5.3L engine |
| P0315 | Crankshaft Position (CKP) System Variation Not Learned | ECM, PCM | DTC P0315 for the 4.2L engine or DTC P0315 for the 5.3L engine |
| P0324 | Knock Sensor (KS) Module Performance | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine |
| P0325 | Knock Sensor (KS) Circuit | PCM | DTC P0325 for the 4.2L engine |
| Knock Sensor (KS) Circuit Bank 1 | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine | |
| P0326 | Knock Sensor (KS) Performance | ECM, PCM | DTC P0326 for the 4.2L engine or DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine |
| P0327 | Knock Sensor (KS) 1 Circuit Low Frequency | PCM | DTC P0327 or P0332 for the 4.2L engine |
| Knock Sensor (KS) Circuit Low Frequency Bank 1 | ECM | Or DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine | |
| P0328 | Knock Sensor (KS) Circuit High Frequency | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 |
| P0330 | Knock Sensor (KS) Circuit Bank 2 | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 |
| P0332 | Knock Sensor (KS) 2 Circuit Low Frequency | PCM | DTC P0327 or P0332 for the 4.2L engine |
| Knock Sensor (KS) Circuit Low Frequency Bank 2 | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine | |
| P0333 | Knock Sensor (KS) Circuit High Frequency Bank 2 | ECM | DTC P0324, P0325, P0326, P0327, P0328, P0330, P0332, or P0333 for the 5.3L engine |
| P0335 | Crankshaft Position (CKP) Sensor Circuit | ECM, PCM | DTC P0335 for the 4.2L engine or DTC P0335 or P0336 for the 5.3L engine |
| P0336 | Crankshaft Position (CKP) Sensor Performance | ECM, PCM | DTC P0336 for the 4.2L engine or DTC P0335 or P0336 for the 5.3L engine |
| P0340 | Camshaft Position (CMP) Sensor Circuit | ECM | DTC P0340 or P0341 for the 5.3L engine |
| P0341 | Camshaft Position (CMP) Sensor Performance | ECM | DTC P0340 or P0341 for the 5.3L engine |
| P0351 | Ignition Coil 1 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0352 | Ignition Coil 2 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0353 | Ignition Coil 3 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0354 | Ignition Coil 4 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0355 | Ignition Coil 5 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0356 | Ignition Coil 6 Control Circuit | ECM, PCM | DTC P0351-P0356 for the 4.2L engine or DTC P0351-P0358 for the 5.3L engine |
| P0357 | Ignition Coil 7 Control Circuit | ECM | DTC P0351-P0358 for the 5.3L engine |
| P0358 | Ignition Coil 8 Control Circuit | ECM | DTC P0351-P0358 for the 5.3L engine |
| P0365 | Exhaust Camshaft Position (CMP) Sensor Circuit | PCM | DTC P0365 for the 4.2L engine |
| P0366 | Exhaust Camshaft Position (CMP) Sensor Performance | PCM | DTC P0366 for the 4.2L engine |
| P0411 | Secondary Air Injection (AIR) System Incorrect Air Flow Detected | PCM | DTC P0411 for the 4.2L engine |
| P0412 | Secondary Air Injection (AIR) Solenoid Control Circuit | PCM | DTC P0412 for the 4.2L engine |
| P0418 | Secondary Air Injection (AIR) Pump Control Circuit | PCM | DTC P0418 for the 4.2L engine |
| P0420 | Catalyst System Low Efficiency | PCM | DTC P0420 for the 4.2L engine |
| Catalyst System Low Efficiency Bank 1 | ECM | DTC P0420 or P0430 for the 5.3L engine | |
| P0430 | Catalyst System Low Efficiency Bank 2 | ECM | DTC P0420 or P0430 for the 5.3L engine |
| P0442 | Evaporative Emission (EVAP) System Small Leak Detected | ECM, PCM | DTC P0442 for the 4.2L engine or DTC P0442 for the 5.3L engine |
| P0443 | Evaporative Emission (EVAP) Purge Solenoid Control Circuit | ECM, PCM | DTC P0443 for the 4.2L engine or DTC P0443 or P0449 for the 5.3L engine |
| P0446 | Evaporative Emission (EVAP) Vent System Performance | ECM, PCM | DTC P0446 for the 4.2L engine or DTC P0446 for the 5.3L engine |
| P0449 | Evaporative Emission (EVAP) Vent Solenoid Control Circuit | ECM, PCM | DTC P0449 for the 4.2L engine or DTC P0443 or P0449 for the 5.3L engine |
| P0451 | Fuel Tank Pressure (FTP) Sensor Performance | ECM, PCM | DTC P0451 for the 4.2L engine or DTC P0451, P0452, P0453, or P0454 for the 5.3L engine |
| P0452 | Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage | ECM, PCM | DTC P0452 for the 4.2L engine or DTC P0451, P0452, P0453, or P0454 for the 5.3L engine |
| P0453 | Fuel Tank Pressure (FTP) Sensor Circuit High Voltage | ECM, PCM | DTC P0453 for the 4.2L engine or DTC P0451, P0452, P0453, or P0454 for the 5.3L engine |
| P0454 | Fuel Tank Pressure (FTP) Sensor Circuit Intermittent | ECM, PCM | DTC P0454 for the 4.2L engine or DTC P0451, P0452, P0453, or P0454 for the 5.3L engine |
| P0455 | Evaporative Emission (EVAP) System Large Leak Detected | ECM, PCM | DTC P0455 for the 4.2L engine or DTC P0455 for the 5.3L engine |
| P0461 | Fuel Level Sensor Performance | ECM, PCM | DTC P0461 |
| P0462 | Fuel Level Sensor Circuit Low Voltage | ECM, PCM | DTC P0462 |
| P0463 | Fuel Level Sensor Circuit High Voltage | ECM, PCM | DTC P0463 |
| P0464 | Fuel Level Sensor 1 Circuit Intermittent | ECM, PCM | DTC P0464 |
| P0480 | Cooling Fan Relay 1 Control Circuit | ECM, PCM | DTC P0480 |
| P0483 | Cooling Fan System Performance | ECM, PCM | DTC P0483 or P0493 |
| P0493 | Cooling Fan Overspeed | ECM, PCM | DTC P0483 or P0493 |
| P0495 | Cooling Fan Speed High | ECM, PCM | DTC P0495 |
| P0496 | Evaporative Emission (EVAP) System Flow During Non-Purge | ECM, PCM | DTC P0496 for the 4.2L engine or DTC P0496 for the 5.3L engine |
| P0502 | Vehicle Speed Sensor (VSS) Circuit Low Voltage | PCM, TCM | DTC P0502 (4.2L) |
| P0503 | Vehicle Speed Sensor (VSS) Circuit Intermittent | PCM, TCM | DTC P0503 (4.2L) |
| P0506 | Idle Speed Low | ECM, PCM | DTC P0506 for the 4.2L engine or DTC P0506 or P0507 for the 5.3L engine |
| P0507 | Idle Speed High | ECM, PCM | DTC P0507 for the 4.2L engine or DTC P0506 or P0507 for the 5.3L engine |
| P0520 | Engine Oil Pressure (EOP) Sensor Circuit | ECM, PCM | DTC P0520 |
| P0521 | Engine Oil Pressure (EOP) Sensor Performance | ECM, PCM | DTC P0521 |
| P0522 | Engine Oil Pressure (EOP) Sensor Circuit Low Voltage | ECM, PCM | DTC P0522 |
| P0523 | Engine Oil Pressure (EOP) Sensor Circuit High Voltage | ECM, PCM | DTC P0523 |
| P0526 | Cooling Fan Speed Sensor Circuit | ECM, PCM | DTC P0526 |
| P0530 | Air Conditioning Refrigerant Pressure Sensor Circuit | ECM, PCM | DTC P0530 |
| P0556 | Brake Booster Pressure Sensor Performance | ECM | DTC P0556, P0557, OR P0558 for the 5.3L engine |
| P0557 | Brake Booster Pressure Sensor Circuit Low Voltage | ECM | DTC P0556, P0557, OR P0558 for the 5.3L engine |
| P0558 | Brake Booster Pressure Sensor Circuit High Voltage | ECM | DTC P0556, P0557, OR P0558 for the 5.3L engine |
| P0562 | System Voltage Low | ECM, PCM | DTC P0562 |
| TCM | DTC P0562 (5.3L) | ||
| P0563 | System Voltage High | ECM, PCM | DTC P0563 |
| TCM | DTC P0563 (5.3L) | ||
| P0567 | Cruise Control Resume Switch Circuit | ECM, PCM | DTC P0567 |
| P0568 | Cruise Control Set Switch Circuit | ECM, PCM | DTC P0568 |
| P0601 | Control Module Read Only Memory (ROM) | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| Transmission Control Module (TCM) Read Only Memory (ROM) | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) | |
| P0602 | Control Module Not Programmed | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| Transmission Control Module (TCM) Not Programmed | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) | |
| P0603 | Control Module Long Term Memory Reset | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| Transmission Control Module (TCM) Long Term Memory Reset | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) | |
| P0604 | Control Module Random Access Memory (RAM) | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| Transmission Control Module (TCM) Random Access Memory (RAM) | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) | |
| P0606 | Control Module Internal Performance | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| P0607 | Control Module Performance | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| P0608 | Vehicle Speed Output Circuit | PCM | DTC P0608 |
| P060D | Control Module Accelerator Pedal Position (APP) System Performance | ECM, PCM | DTC P060D for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| P060E | Control Module Throttle Position (TP) System Performance | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine |
| P062F | Engine Control Module Long Term Memory Performance | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 for the 5.3L engine |
| Transmission Control Module (TCM) Long Term Memory Performance | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) | |
| P0621 | Generator L-Terminal Circuit | ECM, PCM | DTC P0621 |
| P0622 | Generator F-Terminal Circuit | ECM, PCM | DTC P0622 |
| P0641 | 5-Volt Reference 1 Circuit | ECM, PCM | DTC P0641 for the 4.2L engine or DTC P0641 or P0651 for the 5.3L engine |
| P0650 | Malfunction Indicator Lamp (MIL) Control Circuit | ECM, PCM | DTC P0650 for the 4.2L engine or DTC P0650 for the 5.3L engine |
| P0651 | 5-Volt Reference 2 Circuit | ECM, PCM | DTC P0651 for the 4.2L engine or DTC P0641 or P0651 for the 5.3L engine |
| P0654 | Engine Speed Output Circuit | ECM, PCM | DTC P0654 |
| P0685 | Engine Controls Ignition Relay Control Circuit | ECM | DTC P0685, P0689, or P0690 for the 5.3L engine |
| P0689 | Engine Controls Ignition Relay Feedback Circuit Low Voltage | ECM | DTC P0685, P0689, or P0690 for the 5.3L engine |
| P0690 | Engine Controls Ignition Relay Feedback Circuit High Voltage | ECM | DTC P0685, P0689, or P0690 for the 5.3L engine |
| P0700 | Transmission Control Module (TCM) Requested MIL Illumination | ECM | DTC P0700 for the 5.3L engine |
| P0705 | Transmission Range (TR) Switch Circuit | PCM | DTC P0705 (4.2L) |
| P0711 | Transmission Fluid Temperature (TFT) Sensor Performance | PCM, TCM | DTC P0711 (4.2L) or DTC P0711 (5.3L) |
| P0712 | Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage | PCM, TCM | DTC P0712 (4.2L) or DTC P0712 (5.3L) |
| P0713 | Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage | PCM, TCM | DTC P0713 (4.2L) or DTC P0713 (5.3L) |
| P0716 | Input Speed Sensor Performance | TCM | DTC P0716 (5.3L) |
| P0717 | Input Speed Sensor Circuit Low Voltage | TCM | DTC P0717 (5.3L) |
| P0719 | Brake Switch Circuit Low Voltage | PCM, TCM | DTC P0719 (4.2L) or DTC P0719 (5.3L) |
| P0722 | Output Speed Sensor Circuit Low Voltage | TCM | DTC P0722 (5.3L) |
| P0723 | Output Speed Sensor Circuit Intermittent | TCM | DTC P0723 (5.3L) |
| P0724 | Brake Switch Circuit High Voltage | PCM, TCM | DTC P0724 (4.2L) or DTC P0724 (5.3L) |
| P0741 | Torque Converter Clutch (TCC) System - Stuck Off | PCM, TCM | DTC P0741 (4.2L) or DTC P0741 (5.3L) |
| P0742 | Torque Converter Clutch (TCC) System - Stuck On | PCM, TCM | DTC P0742 (4.2L) or DTC P0742 (5.3L) |
| P0748 | Pressure Control (PC) Solenoid Control Circuit | PCM | DTC P0748 (4.2L) |
| P0751 | 1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear | PCM, TCM | DTC P0751 (4.2L) or DTC P0751 (5.3L) |
| P0752 | 1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear | PCM, TCM | DTC P0752 (4.2L) or DTC P0752 (5.3L) |
| P0756 | 2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear | PCM, TCM | DTC P0756 (4.2L) or DTC P0756 (5.3L) |
| P0757 | 2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear | PCM, TCM | DTC P0757 (4.2L) or DTC P0757 (5.3L) |
| P0787 | 3-2 Shift Solenoid (SS) Control Circuit Low Voltage | TCM | DTC P0787 (4.2L) or DTC P0787 (5.3L) |
| P0788 | 3-2 Shift Solenoid (SS) Control Circuit High Voltage | TCM | DTC P0788 (4.2L) or DTC P0788 (5.3L) |
| P0851 | Park/Neutral Position (PNP) Switch Circuit Low Voltage | TCM | DTC P0851 (5.3L) |
| P0852 | Park/Neutral Position (PNP) Switch Circuit High Voltage | TCM | DTC P0852 (5.3L) |
| P0856 | Pulse Width Modulated (PWM) Requested Torque | ECM, PCM | DTC C0241 or P0856 |
| P0894 | Transmission Component Slipping | PCM, TCM | DTC P0894 (4.2L) or DTC P0894 (5.3L) |
| P0961 | Line Pressure Control (PC) Solenoid System Performance | TCM | DTC P0961 (5.3L) |
| P0973 | 1-2 Shift Solenoid (SS) Control Circuit Low Voltage | TCM | DTC P0973 (4.2L) or DTC P0973 (5.3L) |
| P0974 | 1-2 Shift Solenoid (SS) Control Circuit High Voltage | TCM | DTC P0974 (4.2L) or DTC P0974 (5.3L) |
| P0976 | 2-3 Shift Solenoid (SS) Control Circuit Low Voltage | TCM | DTC P0976 (4.2L) or DTC P0976 (5.3L) |
| P0977 | 2-3 Shift Solenoid (SS) Control Circuit High Voltage | TCM | DTC P0977 (4.2L) or DTC P0977 (5.3L) |
| P1101 | Intake Air Flow System Performance | ECM, PCM | DTC P0101 or P1101 for the 4.2L engine or DTC P0101 or P1101 for the 5.3L engine |
| P1133 | HO2S Insufficient Switching Sensor 1 | PCM | DTC P1133 for the 4.2L engine |
| HO2S Insufficient Switching Bank 1 Sensor 1 | ECM | DTC P0133, P0134, P0140, P1133, P2A00 or P2A01 for the 5.3L engine | |
| P1134 | HO2S Transition Time Ratio Sensor 1 | PCM | DTC P1134 for the 4.2L engine |
| P1153 | HO2S Insufficient Switching Bank 2 Sensor 1 | ECM | DTC P0153, P0154, P0160, P1153, P2A03, or P2A04 for the 5.3L engine |
| P1258 | Engine Coolant Overtemperature - Protection Mode Active | ECM, PCM | DTC P1258 |
| P1380 | Misfire Detected - Rough Road Data Not Available | ECM, PCM | DTC P1380 for the 4.2L engine or DTC P1380 or P1381 for the 5.3L engine |
| P1381 | Misfire Detected - No Communication With Brake Control Module | ECM, PCM | DTC P1381 for the 4.2L engine or DTC P1380 or P1381 for the 5.3L engine |
| P1400 | Cold Start Emission Reduction Control System | ECM, PCM | DTC P1400 for the 4.2L engine or DTC P1400 for the 5.3L engine |
| P1481 | Cooling Fan Speed Sensor Circuit | PCM | DTC P1481 |
| P1482 | Cooling Fan Speed Output Circuit | PCM | DTC P1482 |
| P1484 | Cooling Fan System Performance | PCM | DTC P1484 |
| P1516 | Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance | ECM, PCM | DTC P1516 for the 4.2L engine or DTC P1516, P2101, P2119, or P2176 for the 5.3L engine |
| P1574 | Stop Lamp Switch Circuit | ECM, PCM | DTC P1574 |
| P1621 | Transmission Control Module (TCM) Long Term Memory Performance | TCM | DTC P0601, P0602, P0603, P0604, P062F or P1621 (5.3L) |
| P1626 | Theft Deterrent Fuel Enable Signal Lost | ECM, PCM | DTC P1626 |
| P1630 | Theft Deterrent Learn Mode Active | ECM, PCM | DTC P1630 |
| P1631 | Theft Deterrent Fuel Enable Signal Not Correct | ECM, PCM | DTC P1631 |
| P1668 | Generator L-Terminal Control Circuit | ECM | DTC P1668 |
| P1682 | Ignition 1 Switch Circuit 2 | ECM, PCM | DTC P1682 for the 4.2L engine or DTC P1682 for the 5.3L engine |
| P1689 | Pulse Width Modulated (PWM) Delivered Torque | PCM | DTC C0244 or P1689 (1) or DTC C0244 or P1689 (2) |
| P1810 | Transmission Fluid Pressure (TFP) Position Switch Circuit | PCM, TCM | DTC P1810 (4.2L) or DTC P1810 (5.3L) |
| P1815 | Transmission Fluid Pressure (TFP) Valve Position Switch - Start in Wrong Range | TCM | DTC P1815 (5.3L) |
| P1816 | Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Park/Neutral (P/N) with Drive Ratio | TCM | DTC P1816 (5.3L) |
| P1818 | Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio | TCM | DTC P1818 (5.3L) |
| P2101 | Control Module Throttle Actuator Position Performance | ECM, PCM | DTC P2101 for the 4.2L engine or DTC P1516, P2101, P2119, or P2176 for the 5.3L engine |
| P2119 | Throttle Closed Position Performance | ECM, PCM | DTC P2119 for the 4.2L engine or DTC P1516, P2101, P2119, or P2176 for the 5.3L engine |
| P2120 | Accelerator Pedal Position (APP) Sensor 1 Circuit | ECM, PCM | DTC P2120 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2122 | Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage | ECM, PCM | DTC P2122 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2123 | Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage | ECM, PCM | DTC P2123 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2125 | Accelerator Pedal Position (APP) Sensor 2 Circuit | ECM, PCM | DTC P2125 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2127 | Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage | ECM, PCM | DTC P2127 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2128 | Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage | ECM, PCM | DTC P2128 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2135 | Throttle Position (TP) Sensor 1-2 Correlation | ECM, PCM | DTC P2135 for the 4.2L engine or DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 for the 5.3L engine |
| P2138 | Throttle Position (TP) Sensor 1-2 Correlation | ECM, PCM | DTC P2138 for the 4.2L engine or DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 for the 5.3L engine |
| P2176 | Minimum Throttle Position Not Learned | ECM, PCM | DTC P2176 for the 4.2L engine or DTC P1516, P2101, P2119, or P2176 for the 5.3L engine |
| P2430 | Secondary Air Injection (AIR) System Pressure Sensor Circuit | PCM | DTC P2430 for the 4.2L engine |
| P2431 | Secondary Air Injection (AIR) System Pressure Sensor Performance | PCM | DTC P2431 for the 4.2L engine |
| P2432 | Secondary Air Injection (AIR) System Pressure Sensor Circuit Low Voltage | PCM | DTC P2432 for the 4.2L engine |
| P2433 | Air Injection (AIR) System Pressure Sensor Circuit High Voltage | PCM | DTC P2433 for the 4.2L engine |
| P2440 | Secondary Air Injection (AIR) System Valve Stuck Open | PCM | DTC P2440 for the 4.2L engine |
| P2444 | Secondary Air Injection (AIR) System Pump Stuck On | PCM | DTC P2444 for the 4.2L engine |
| P2534 | Ignition 1 Switch Circuit Low Voltage | TCM | DTC P2534 (5.3L) |
| P2610 | Control Module Ignition Off Timer Performance | ECM, PCM | DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P060E, P1600, P1621, P1627, P1681, P1683, or P2610 for the 4.2L engine or DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, OR P2610 for the 5.3L engine |
| P2763 | Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage | PCM, TCM | DTC P2763 (4.2L) or DTC P2763 (5.3L) |
| P2764 | Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage | PCM, TCM | DTC P2764 (4.2L) or DTC P2764 (5.3L) |
| P2769 | Torque Converter Clutch (TCC) Enable Solenoid Control Circuit Low Voltage | TCM | DTC P2769 (4.2L) or DTC P2769 (5.3L) |
| P2770 | Torque Converter Clutch (TCC) Enable Solenoid Control Circuit High Voltage | TCM | DTC P2770 (4.2L) or DTC P2770 (5.3L) |
| P2A00 | HO2S Circuit Sensor 1 | PCM | DTC P2A00 for the 4.2L engine |
| P2A01 | HO2S Performance Sensor 2 | PCM | DTC P2A01 for the 4.2L engine |
| HO2S Performance Bank 1 Sensor 2 | ECM | DTC P0133, P0134, P0140, P1133, P2A00 or P2A01 for the 5.3L engine | |
| P2A04 | HO2S Performance Bank 2 Sensor 2 | ECM | DTC P0153, P0154, P0160, P1153, P2A03, or P2A04 |
| P3401 | Cylinder 1 Deactivation Solenoid Control Circuit | ECM | DTC P3401, P3425, P3441, OR P3449 |
| P3425 | Cylinder 4 Deactivation Solenoid Control Circuit | ECM | DTC P3401, P3425, P3441, OR P3449 |
| P3441 | Cylinder 6 Deactivation Solenoid Control Circuit | ECM | DTC P3401, P3425, P3441, OR P3449 |
| P3449 | Cylinder 7 Deactivation Solenoid Control Circuit | ECM | DTC P3401, P3425, P3441, OR P3449 |
| U0100 | Lost Communication With Engine Control Module (ECM) | TCM | DTC U0100-U0299 |
| U0101 | Lost Communication With Transmission Control Module (TCM) | ECM | DTC U0100-U0299 |
| U1000 | Class 2 Data Link Malfunction | Audio Amplifier, BCM, DDM, DSM, DRR, DVD Player, EBCM, HVAC, HVAC-Aux., PLGM, IPC, PCM, PDM, Radio, SDM, TCSCM, VCIM, VTD | DTC U1000 |
| U1016 | Lost Communications With Powertrain/Engine Control Module (PCM/ECM) | BCM, DDM, DSM, DVD Player, HVAC, HVAC-Aux., IPC, PDM, Radio, SDM, TCSCM, VTD | DTC U1001-U1254 |
| U1026 | Lost Communications With Transfer Case Shift Control Module (TCSCM) | IPC, PCM | DTC U1001-U1254 |
| U1041 | Lost Communications with Electronic Brake Control Module (EBCM) | IPC, PCM, SDM, TCSCM | DTC U1001-U1254 |
| U1064 | Lost Communications With Body Control Module (BCM) | DSM, DVD Player, HVAC, HVAC-Aux., IPC, PCM, Radio, SDM, TCSCM, VCIM, VTD | DTC U1001-U1254 |
| U1088 | Lost Communications with Inflatable Restraint Sensing and Diagnostic Module (SDM) | IPC, Radio, VCIM | DTC U1001-U1254 |
| U1096 | Lost Communications With Instrument Panel Cluster (IPC) | BCM, SDM | DTC U1001-U1254 |
| U1128 | Lost Communications With Radio | HVAC-Aux. | DTC U1001-U1254 |
| U1133 | Lost Communications with DVD Player | Radio | DTC U1001-U1254 |
| U1137 | Lost Communications With Digital Radio Receiver (DRR) | Radio | DTC U1001-U1254 |
| U1151 | Lost Communications With Communication Interface Module (OnStar®) | Radio | DTC U1001-U1254 |
| U1152 | Lost Communications with HVAC Control Module | DDM, HVAC-Aux., PLGM, PCM, PDM | DTC U1001-U1254 |
| U1160 | Lost Communications with Driver Door Module (DDM) | BCM, DSM, IPC, PDM | DTC U1001-U1254 |
| U1161 | Lost Communications with Passenger Door Module (PDM) | BCM, DDM, IPC | DTC U1001-U1254 |
| U1162 | Lost Communications with Liftgate Control Module (PLGM) | BCM, IPC | DTC U1001-U1254 |
| U1166 | Lost Communications with Driver Seat Module (DSM) | DDM, PDM | DTC U1001-U1254 |
| U1167 | Lost Communications with HVAC Control Module - Rear Auxiliary | HVAC, Radio | DTC U1001-U1254 |
| U1192 | Lost Communications with Theft Deterrent Control Module (VTD) | BCM, PCM | DTC U1001-U1254 |
| U1241 | Lost Communication With Scan Tool | SDM | DTC U1241 |
| U1300 | Class 2 Data Link Low | DVD Player, HVAC, IPC, PCM, Radio, SDM, VCIM | DTC U1300, U1301, or U1305 (4.2L) or DTC U1300, U1301, or U1305 (5.3L) |
| U1301 | Class 2 Data Link High | DVD Player, HVAC, IPC, PCM, Radio, SDM, VCIM | DTC U1300, U1301, or U1305 (4.2L) or DTC U1300, U1301, or U1305 (5.3L) |
| U1305 | Class 2 Data Link Low or High | BCM, DSM, HVAC, HVAC-Aux. | DTC U1300, U1301, or U1305 (4.2L) or DTC U1300, U1301, or U1305 (5.3L) |
| U1500 | Inter-Device Dedicated Bus Malfunction | VCIM | DTC U1500 |
| U2100 | High Speed CAN Communication Bus | TCM | DTC U2100 |
| U2105 | Lost Communication With Engine Control Module (ECM) | TCM | DTC U2105-U2199 |
| 001 | System Disabled Information Stored | Air Suspension Compressor Assembly | DTC 001 |
| 002 | Left Rear Position Sensor Circuit | Air Suspension Compressor Assembly | DTC 002 |
| 003 | Right Rear Position Sensor Circuit | Air Suspension Compressor Assembly | DTC 003 |
| 023 | Seat Belt Tension Sensor Circuit Out of Range | PPS | DTC 023 |
| 024 | Ignition 1 Voltage Performance | PPS | DTC 024 |
| 063 | PPS Out of Calibration | PPS | DTC 063 |
| 064 | PPS Communication/ID Performance | PPS | DTC 064 |
| 065 | PPS Sensor Circuit Out of Range | PPS | DTC 065 |
Diagnostic Trouble Code (DTC) List - Vehicle
Diagnostic Repair Verification
- Install any components or connectors that have been removed or replaced during diagnosis.
- Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
- Clear the DTCs.
- Turn OFF the ignition for 60 seconds.
- If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(ref-268112-S07221794022007101800000) and perform the appropriate diagnostic procedure. Or If the repair was symptom related, duplicate the conditions under which the customer concern occurred to verify the repair. If the customer concern reoccurs, return to «Symptoms - Vehicle»(ref-268112-S26614402562007101800000) and perform the appropriate symptom diagnostic.
DTC Symptom Categories
The DTC symptom is made up of 2 alphanumeric digits. The first digit following the DTC indicates the DTC symptom category. There are 16 possible categories available in the range of 0 through the letter F. Currently there are 8 categories in use, 0 through 7. These 8 categories together with their definitions are given below.
| Category Number | Category Name | Category Description |
|---|---|---|
| 0 | General Electrical Failures | This category includes standard wiring failure modes, direct current quantities related by Ohm's Law and quantities related to amplitude, frequency or rate of change, and wave shape. |
| 1 | Additional General Electrical Failures | This category includes the overflow from the previous category. |
| 2 | FM/PWM (Frequency/Pulse Width Modulated) Failures | This category includes faults related to frequency modulated and pulse width modulated inputs and outputs of the electronic control module (ECU). This category also includes faults where position is determined by counts. |
| 3 | ECU Internal Failures | This category includes faults related to memory, software, and internal electrical circuitry; requiring ECU replacement. |
| 4 | ECU Programming Failures | This category includes faults related to operational software, calibrations, and options, remedied by programming the ECU. |
| 5 | Algorithm Based Failures | This category includes faults based on comparing two or more input parameters for plausibility or comparing a single parameter to itself with respect to time. |
| 6 | Mechanical Failures | This category includes faults detected by inappropriate motion in response to an ECU controlled output. |
| 7 | Bus Signal/Message Failures | This category includes faults related to bus hardware and signal integrity. This category is also used when the physical input for a signal is located in one ECU and another ECU diagnoses the circuit. |
| 8-F | Reserved by Document | Not in use at this time. |
DTC Symptom Description
DTC Symptom Subtypes
The second digit of the DTC symptom is the subtype of the DTC symptom. These subtypes and their categories, together with their definitions, are given in the following table. DTC symptom 00 is a special case. If 00 is displayed, only the base code number and its description apply. Information regarding the fault will be provided in the code setting criteria.