Vehicle Diagnostic Information - Diagnostic Information and Procedures Buick Regal V

Strategy Based Diagnosis

The goal of Strategy Based Diagnosis 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 Diagnosis 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 Understand and Verify the Customer's Concern. The final step of your diagnostic process should be Repair and verify the Fix. Refer to the following chart for the correct Strategy Based Diagnosis.

Scheme 31

1. Understand and Verify the Customer's 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 information for any information needed.
2. Vehicle Operating 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 the system to the customer. If the customer is dissatisfied submit a Field Product Report.
3. 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.
4. Perform Published Diagnostic System Check- Vehicle: The «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) verifies the proper operation of the system. This will lead the technician in an organized approach to diagnostics and identify what category of diagnostic to perform.
5. Check for related Bulletins, Recalls and Preliminary Information (PI).
6. Diagnostic categories: Current DTC: Follow the designated DTC diagnostic in order to make an effective repair. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . Symptom - No DTC: Select the appropriate symptom diagnostic. Follow the diagnostic steps or suggestions in order to complete the repair. Refer to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) . No Published Diagnostics: Analyze the Concern. Develop a plan for the diagnostics. The service information 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, or corrosives (road salt, battery acid, oil or other fluids). Utilize the wiring diagrams, system description and operation, and system circuit description. Intermittent/History DTC: An intermittent condition is one that does not occur continuously, may be difficult to duplicate, and will only occur when certain conditions are met. Generally, an intermittent is caused by faulty electrical connections and wiring, malfunctioning components, electromagnetic/radio frequency interference, driving conditions, or aftermarket equipment. The following approaches/tools may prove to be beneficial in locating and repairing an intermittent condition or history DTC. Combining technicians knowledge with the available service information. Evaluate the symptoms and conditions described by the customer on the «Customer Concern Verification Sheets»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__customer-concern-verification-sheets) . Follow the suggestions on «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor) . Use the available scan tool, digital multi-meter, or J-42598-B vehicle data recorder with data capturing capabilities.
7. Isolate the Root Cause then Repair and Verify Fix: After isolating the root cause, make the repairs and validate for the correct operation by performing the «Diagnostic Repair Verification»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-repair-verification) . Verifying that the DTC or symptom has been corrected may involve road testing the vehicle.
8. 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.

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

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

ECT Sensor Temperature - PCM

Circuit/System Description

Circuit/System Description identifies how a circuit/system normally functions.

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.

Reference Information

Reference Information includes links providing additional information for the diagnostic procedure.

For example

1. Schematic Reference
2. Connector End View Reference
3. Description and Operation
4. Electrical Information Reference
5. DTC Type Reference
6. Scan Tool Reference
7. Special Tools Required

Circuit/System Verification

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, performing the Circuit/System Verification category first, aids in determining if a vehicle condition is current. Some diagnostic categories may state that another category must be performed first when there are testing dependencies.

This category also serves to route the technician to other diagnostic procedures which should be performed first; for example, a DTC with a higher priority.

Circuit/System Verification is a non-intrusive procedure outlining how to verify that a system or a portion of a system is functioning correctly. During the verification process, the vehicle is kept intact and tested as a complete system. This verification is used to assist the technician in determining whether a condition is current or intermittent. When a condition is determined to be intermittent, a technician can use the link in Electrical Information Reference: Testing for Intermittent Conditions and Poor Connections for additional testing information.

The technician should be able to identify if the fault is occurring on the input circuit - signal or on the output circuit - control when applicable. The technician will need to decide from the verification results if the system is working correctly or if further diagnosis needs to be performed in either Circuit/System Testing and/or Component Testing.

To assist the technician in identifying a common part a component code is used. These codes are not translated so they will always be the same even though the part name may have slight variance. The component codes will always be the same once assigned to a unique part name and will be found on the schematics and in the diagnostic procedure categories Circuit/System Verification, Circuit/System Testing, and Component Testing categories.

Component Codes

The component codes used on the schematics will have the base code with an extension to identify location or quantity. For example the ABS wheel speed sensors are identified on the schematic with a base code (B5) and a location extension (LF, RF, LR, and RR) as seen below

1. B5LF Wheel Speed Sensor (WSS)-Left Front
2. B5RF Wheel Speed Sensor (WSS)-Right Front
3. B5LR Wheel Speed Sensor (WSS)-Left Rear
4. B5RR Wheel Speed Sensor (WSS)-Right Rear

B5 is the base code for the wheel speed sensor and the LF, RF, LR, and RR indicate the on vehicle location.

The diagnostic procedures will use the base code (B5) for a wheel speed sensor but may or may not use the extension identifying location (LF, RF, LR, and RR). Example: Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor. This is done so the diagnostic procedure can be common for all four wheel speed sensors and not have to take into account part location or quantity.

Where the diagnostic states "the appropriate" it is up to the technician to identify which component is being diagnosed by the symptom stated on the RO (drivers door lock is inoperative) or by the DTC descriptor (DTC C0585 04: Left Rear Actuator Circuit Open).

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. Some diagnostic categories may state that another category must be performed first when there are testing dependencies.

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 numbered test step is achieved, the normal flow is to proceed to the next numbered test step (indicated by the down pass arrow). If the result of a numbered test step is NOT achieved, the right repair arrow bullet --> below the failed test 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 for additional information.

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. Some diagnostic categories may state that another category must be performed first when there are testing dependencies.

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.

Repair Instructions

Repair Instructions provides a link to Diagnostic Repair Verification . This link describes how to verify the vehicle is repaired.

All links to Repair or Replacement procedures are located here.

Repair Verification

Repair Verification describes how to verify the vehicle is repaired when additional instructions are needed beyond what is in Diagnostic Repair Verification.

Diagnostic System Check Instructions

The following is an overview of instructions for the general information and 14 step System Verification included in the Diagnostic System Check - Vehicle procedure.

A link to Strategy Based Diagnosis is provided as an overview on how a technician should diagnose a vehicle.

A link to the Diagnostic System Check Instructions is provided. This provides an overview of instructions and examples for the general information and 14 step System Verification included in the Diagnostic System Check - Vehicle procedure. The examples in this document are intended to give the technician a general idea of what the test step is referring to. They are not intended to list every possible condition or situation.

Diagnostic Systems Check steps are listed by priority to guide the technician to the appropriate diagnostic procedure to correct the customer concern. There are many ways to determine the priority of diagnosing a vehicle concern. Some faults can cause customer perceived symptoms in areas unrelated to the fault. Using an example from the System Check, after reading DTCs, the technician is asked to verify there are no Electronic Control Unit Internal Performance Faults present. It is important that any internal performance issues are addressed prior to continuing through the System Check. There is no benefit addressing other DTCs that could be set due to an internal fault to a control module. If the fault is present, performing the diagnostic procedure for that fault will likely correct the customer perceived concern and possibly eliminate other DTCs that may be set.

Not all steps of the Diagnostic System Check have to be performed. The Diagnostic System Check tries to prioritize the test steps with the highest priority faults first. The technician is then lead to another document to do the actual diagnosis or repair. The strategy is to repair higher level faults that may be the cause of other system or component level symptoms. Additionally, the Diagnostic System Check can only be used for a single fault at a time. If additional faults are present, the technician must perform the diagnostic system check for each concern until all customer concerns are corrected.

Once a repair has been completed, General Motors diagnostic strategy is to always have the technician verify that the customer concern has been corrected. This is to prevent comebacks and to ensure customer satisfaction with their dealership experience. Therefore a link has been provided to Diagnostic Repair Verification procedure for the technician to verify the customer concern has been corrected.

There are some assumptions made when General Motors prepares service information. They include the following areas which are presumed to function as designed

1. The 12-volt battery is fully charged. General Motors assumes the majority of vehicles brought in for repair will be able to start and be driven into the service stall. If the vehicle has a dead battery, it is slow cranking or for any other reason the technician feels the customer concern may be battery related, a link is provided to «Battery Inspection/Test»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) . This procedure will guide the technician through inspecting and verifying the battery functions properly.
2. Fuses should not be open. General Motors does not call out in diagnostic procedures to verify a fuse. The technician is expected to find an open fuse when the diagnostic test step states to check for an open circuit condition. Therefore a link has been provided to «Power Distribution Schematics»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) , and «Electrical Center Identification Views»(/buick/regal/v-2009-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) for technicians to reference power sources and fuse locations if they feel there may be loss of power due to an open fuse condition.
3. Ground circuits are clean, tight, and in the correct location. General Motors assumes that the original ground circuits have not been compromised. The technician is expected to find a poor ground connection when the diagnostic test step states to test the ground circuit for an open/high resistance. Therefore a link has been provided to «Ground Distribution Schematics»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) , and «Harness Routing Views»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) for technicians to reference ground locations and which ground circuits may be related to the customer concern.
4. All connections/connectors are fully seated. General Motors assumes that all connections are properly installed. The technician is expected to find an open or poor connection when the diagnostic test step asks to test the circuit for an open/high resistance. Therefore a link has been provided to «COMPONENT CONNECTOR END VIEWS -- INDEX»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index) for technicians to reference which connections may be related to the customer concern.
5. There are no aftermarket devices that affect the operation of the system. General Motors can only author diagnostic and repair information for vehicle systems and components that are original equipment or genuine GM Accessories. Aftermarket equipment can negatively affect original equipment operation and lead a technician's diagnosis of a concern in the wrong direction. Therefore a link has been provided to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) that guides a technician through the possible causes of vehicle problems related to aftermarket accessories.
6. The scan tool powers up. General Motors assumes that power is available at the Data Link Connector and the scan tool will power on. Therefore a link has been provided to «Scan Tool Does Not Power Up»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system) if the technician finds that the scan tool does not power on.

Diagnostic System Check

1. VERIFY CUSTOMER CONCERN-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? Review the service history of the vehicle for previous repairs that could help diagnose the current concern. Now that the technician understands the customer concern, they should validate the concern on the vehicle. 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 information for any information needed. Inspect the visible system components for obvious damage or conditions that could cause the concern. Conduct a thorough visual inspection. Detect unusual sounds or odors. The condition described by the customer may be normal. If the technician finds the vehicle to operate normally, compare with another like vehicle that is operating normally, under the same conditions described by the customer. If this is the case, explain your findings and the operation of the system to the customer. If the customer is dissatisfied, submit a Field Product Report.
2. BULLETIN SEARCH-By searching for related bulletins, recall/field actions and preliminary information documents, a procedure for a known field issue may resolve the customer concern with little or no diagnosis necessary saving the technician diagnostic time.
3. MECHANICAL CONCERNS-This step is designed to take the technician directly to a list of symptom diagnostic procedures. The technician is asked to verify the symptoms exhibited by the system are mechanical in nature and not related to an electrical system, see some examples below. If the technician feels the concern could be related to an electrical system, they should continue through the Diagnostic System Check to verify the electrical functionality of vehicle. If the technician feels the concern is exclusively related to a mechanical system, a link to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) is provided to select the appropriate symptom diagnostic procedure for the customer concern. Examples: Brake noise or diagnosing irregular pad wear Water leak diagnosis Engine or transmission fluid leak diagnosis Manual window or door lock diagnosis Vehicle vibration diagnosis Exhaust noise or leak diagnosis
4. VEHICLE POWER UP VERIFICATION-The technician is asked in this step to turn the ignition key ON and verify that the vehicle powers up. The technician should look for clues that multiple vehicle systems are receiving vehicle powermode messages, such as the cluster waking up, the radio powers on, the HVAC blower is operational, windshield wipers turn on, etc, with the key ON. This would be a rare condition as both the powermode master and back-up powermode master would have to be inoperable, however, if the vehicle does not power up, a link to «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) is provided.
5. CONTROL MODULE COMMUNICATION and DTC CHECK-The technician is asked in this step to record the following three pieces of data on the Repair Order; any control module that the scan tool determined is not communicating, any DTC and symptom byte set current or history, and the control module that has set the DTC. This is considered a setup step for the rest of the Diagnostic System Check. The technician is not expected to do anything other than record the three pieces of data provided by the scan tool on the Repair Order. This provides the information needed to complete the rest of the diagnostic system check. To complete this step, the technician is asked to utilize the scan tool function called Vehicle DTC Information located in Vehicle Control Systems. This function will query every possible control module on the vehicle requesting all DTCs. During the DTC query, the scan tool will try to establish communication with each control module. If the scan tool can communicate with the control module during the DTC request, it will display PRESENT and provide the number of DTCs set in the control module. If the scan tool cannot communicate with a control module, it will only display NOT COMMUNICATING. Since the scan tool cannot determine if a given control module should be present or not, the technician is asked in a future step to verify that the vehicle was not built with control modules listed as NOT COMMUNICATING. If the scan tool cannot establish communications with ALL of the vehicles control modules, a link to «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) is provided. A faulty control module or fault with the serial data circuit can cause no communication with all of the control modules on the vehicle. If any control module communicates on the serial data circuit, continue through the Diagnostic System check, as a future step will address any specific non communicating or group of non communicating control modules. Once the scan tool has completed the routine, the technician should review each control module that has set a DTC and document them on the Repair Order. When reviewing the DTCs, the technician should take notice if any DTCs are powertrain related, and if so, navigate in the scan tool to the Powertrain area and utilize the Capture Info function. This will upload any Freeze Frame/Failure Records stored in the control module to the scan tool in case the data is lost from the control module. As an example, if the technician commands a Clear DTCs function on a powertrain controller, all diagnostic information stored in the controller is erased. This includes Freeze Frame/Failure Records and Inspection/Maintenance System Status indicators, if required for your region.
6. CONTROL MODULE INTERNAL PERFORMANCE FAULTS-The technician is asked to review the DTCs recorded in step 5 and verify there are no control module internal performance faults set current. This type of fault may be the cause of other symptoms or DTCs displayed by the vehicle. By addressing this fault first, the technician may find the other concerns are resolved. The technician should always follow the diagnostic procedure for these types of faults prior to replacing any control module. If the technician finds a control module has an internal performance fault, a link is provided to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to select the appropriate DTC diagnostic procedure. Examples: B1000 Electronic Control Unit Performance B101D ECU Hardware Performance C0550 Electronic Control Unit Performance C056D ECU Hardware Performance C0570 Auxiliary Electronic Control Unit Performance P0606 Control Module Internal Performance P0607 Control Module Performance
7. CONTROL MODULE COMMUNICATION VERIFICATION-This step is used to ensure the control modules that are NOT COMMUNICATING were not built on the vehicle. To understand if the vehicle was built with that option, we provide a link to the «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) , document where Regular Production Options (RPOs) are listed next to ECU names and can be compared to those the vehicle was built with. If the technician determines that a control that is NOT COMMUNICATING should be present, the technician is asked to follow the appropriate diagnostic procedure listed in the «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) document.
8. COMMUNICATION and POWERMODE FAULTS-This step is asking the technician to look for communication DTCs or DTCs related to control modules powering up based on power mode, communication enable or wake-up circuits. See in the below table some examples of the DTCs the technician should diagnose prior to continuing through the Diagnostic System Check. The technician should review the list of DTCs recorded in step 4 and verify that none of these type of DTCs are present. If so, the technician is referred to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to select the appropriate DTC diagnostic procedure. Examples: U0140 Lost Communication With Body Control Module U0164 Lost Communication With HVAC Control Module U0170 Lost Communication With Passenger Presence Detection Module U0402 Invalid Data Received From Transmission Control Module U0452 Invalid Data Received From Inflatable Restraint Sensing and Diagnostic Module U1814 Powertrain High Speed Communication Enable Circuit B1428 Ignition Switched Power Run/Crank Relay Circuit B137B Accessory Power Module Wake Up Circuit C0897 Control Module Power Moding P2536 Ignition Accessory Switch Circuit
9. POWER MODE VERIFICATION-This step verifies the Power Mode Master is receiving the proper output state of the ignition switch. The technician should use the main power mode input, this being either the ignition key or, on vehicles equipped with Passive Entry Passive Start, the push button switch. The test should not be performed using a key fob, if the MIL is illuminated the powertrain controller may disable this input. The technician is asked to perform the test with the driver door open. This ensures the retained accessory power mode is inactive during this test which could result in different scan tool readings. The technician is only asked to verify the current Power Mode parameter in the power mode data display list. If the parameter does not match the actual ignition switch position, a link is provided to perform the «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) diagnostic procedure.
10. ENGINE CRANK and RUN VERIFICATION-Here the technician is asked to verify that the engine cranks and runs. The technician should use the main power mode input, this being either the ignition key or, on vehicles equipped with Passive Entry Passive Start, the push button switch, to complete this step. The test should not be performed using a key fob, if the MIL is illuminated the powertrain controller may disable this input. The technician should know at this point whether the engine cranks and runs without having to actually performing this test step. One of the follow has probably already occurred and this step can be skipped: The technician drove the vehicle into the stall or verified when checking the Crank and Run parameter in step 8. If the technician has not already somehow verified the engine cranks in previous steps, the technician should perform this test step. Regardless of how this step was performed, if the engine does not crank, a link is provided to «Engine Does Not Crank»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__engine-does-not-crank) , or if the engine cranks but does not run, a link is provided to «Engine Cranks But Does Not Run»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__engine-cranks-but-does-not-run) for the technician to choose the correct diagnostic procedure for the actual engine application being used.
11. REMAINING DTC REVIEW-Here the technician is asked to review any remaining DTCs that were not addressed in previous steps. The technician is asked first to verify there are no control module supply voltage, system voltage or 5V circuit DTCs present. Control modules, systems or components with insufficient or zero voltage can cause one or multiple symptoms to exist on the vehicle. Control module voltage issues could also be the cause of failures during a programming event. The technician should correct voltage issues prior to addressing any programming or configuration DTCs. The technician should then check for any ECU programming, setup or configuration DTCs. By programming software or configuring a control module, the technician could correct the customer concern unobtrusively. The remaining DTCs, which are usually specific system or component faults, are diagnosed last. They can include ECU input and output circuit DTCs or individual circuit faults that usually cause single symptoms or failure modes on the vehicle and can be fixed following the proper DTC diagnostic procedure. In general, the technician should think about what DTCs or faults could be caused by another DTC or fault. A failed sensor may set a component DTC and then the system may set a DTC indicating the system cannot operate properly. By correcting the sensor fault, the system may now operate properly and the system level DTC will transition to history. Refer to the examples within each category below to understand the differences between these DTCs. If DTCs of these type are current, the technician is referred to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to choose the correct DTC diagnostic procedure. Voltage DTCs B1325 Device Power 1 Circuit C0875 Device Voltage Reference Input 2 Circuit C1001 Adaptive Cruise Control Indicators Supply Voltage Circuit P0641 5-Volt Reference Circuit P0787 Downshift Timing Solenoid Control Circuit Low Voltage Programming, Setup, Configuration or Software Performance DTCs B3943 Steering Column Lock has Not Learned Column Integration Module B101E ECU Software Performance B1019 System Configuration Error C0558 Calibration Data Not Programmed P0630 VIN Not Programmed or Mismatched - Powertrain Control Module (PCM) Component related DTCs B0013 Driver Frontal Deployment Loop Stage 2 B0163 Passenger Compartment Temp Sensor Circuit C0045 Left Rear Wheel Speed Sensor Circuit P0565 Cruise Control Switch Circuit P0751 1-2 Shift Solenoid (SS) Valve Performance System related DTCs B1010 System Sensors Data Mismatch C0176 System Thermal Error C0561 System Disabled Information Stored P1564 Vehicle Acceleration Too High - Cruise Control Disabled P1625 Transmission Control Module (TCM) System Reset Any other remaining DTCs-The technician should diagnose and correct any other DTCs that are left that were not from the categories above.
12. EMISSION RELATED INSPECTION/MAINTENANCE TESTING CONCERNS-Several regions require that a vehicle pass on-board diagnostic system tests and the inspection/maintenance emission tests in order to renew license plates or vehicle registration. This is accomplished by viewing the Inspection/Maintenance System Status display on a scan tool. Using a scan tool, the technician can observe the Inspection/Maintenance System Status in order to verify that the vehicle meets the criteria that comply with the local area requirements. If inspection and maintenance checks are required in your region, and the customer concern is related to not passing an Inspection/Maintenance test, a link is provided to «Inspection/Maintenance System Check»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__inspectionmaintenance-system-check) where the technician can choose the appropriate Inspection/Maintenance System Check for the actual engine application being used.
13. SYMPTOM DIAGNOSIS-At this step, the diagnostics are assuming that the only information the technician has available to diagnose the customer concern are symptoms of a problem. There are no DTCs set current or history. There may be a Driver Information Center display message or a system indicator to aid in identifying the root cause. The technician should evaluate the symptoms and conditions described by the customer and perform the symptoms diagnostics for the area of customer concern. A link is provided to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) which contains a list of all symptoms related to this service manual publication.

Diagnostic Starting Point - Vehicle

Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide a complete strategy to locate and repair a mechanical or electrical vehicle fault. Not following this strategy may cause additional diagnostic time and/or misdiagnosis.

The Diagnostic System Check - Vehicle will provide the following strategy

1. When to verify the customer concern and identify related bulletins, recalls and preliminary information
2. When to identify a control module that is not communicating, a control module that has set a DTC, and the DTC diagnostic priority
3. When to address power mode concerns
4. When to verify the engine cranks and runs
5. When to diagnose symptom related concerns

1. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
2. «Diagnostic System Check Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-system-check-instructions) provides an overview of each diagnostic step.
3. Continue through the Diagnostic System Check until you are directed to follow a particular diagnostic or repair procedure. Once a repair has been completed, perform the «Diagnostic Repair Verification»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-repair-verification) and verify the customer concern has been corrected.

The diagnostic procedures within this service information are developed on the assumption that the following areas function as designed

1. The 12V battery is fully charged and cables are clean and tight. Refer to «Battery Inspection/Test»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid) .
2. Fuses are not open. Refer to «Power Distribution Schematics»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) , and «Electrical Center Identification Views»(/buick/regal/v-2009-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views) .
3. Ground circuits for the area of customer concern are clean, tight, and in the correct location. Refer to «Ground Distribution Schematics»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) , and «Harness Routing Views»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams) .
4. All connections/connectors for the area of concern are fully seated. Refer to «COMPONENT CONNECTOR END VIEWS -- INDEX»(/buick/regal/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-component-connector-end-views-index) .
5. There are no aftermarket devices that affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
6. The scan tool powers up. Refer to «Scan Tool Does Not Power Up»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system) .

1. VERIFY CUSTOMER CONCERN-Understand and validate the customer concern. Inspect the visible system components for obvious damage or conditions that may cause the concern.
2. BULLETIN SEARCH-Check for related bulletins, recall/field actions and preliminary information.
3. MECHANICAL CONCERNS-Verify the symptom is not exclusively a mechanical concern. If the symptom is exclusively a mechanical concern, refer to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
4. VEHICLE POWER UP VERIFICATION-Ignition ON, verify the vehicle powers up. If the vehicle does not power up, refer to «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) .
5. CONTROL MODULE COMMUNICATION and DTC CHECK-Using a scan tool, perform the Vehicle DTC Information function and verify at least one control module communicates with the scan tool. Record on the Repair Order the following information: Any control module that is not communicating. Any DTC, including symptom byte, and the control module that has set the DTC. If the scan tool does not communicate with any control module on the vehicle, refer to «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) .
6. CONTROL MODULE INTERNAL PERFORMANCE FAULTS-Verify there are no current control module Internal Hardware Performance DTCs set. If any DTC of this type is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
7. CONTROL MODULE COMMUNICATION VERIFICATION-Verify the vehicle is built with any control module listed as not communicating, refer to «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) . All control modules should be communicating, as equipped. If the scan tool does not communicate with one or more control modules refer to «Data Link References»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__data-link-references) .
8. COMMUNICATION and POWERMODE FAULTS-Verify there are no current control module Power Mode or Communication DTCs set. If any DTC of this type is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
9. POWER MODE VERIFICATION-Driver door open, observe the scan tool Power Mode parameter while cycling the ignition switch through all the power modes. Verify the current Power Mode parameter matches the actual ignition switch positions. If the Power Mode parameter does not match the actual ignition switch positions, refer to «Power Mode Mismatch»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures) .
10. ENGINE CRANK and RUN VERIFICATION-Verify that the engine cranks and runs. If the engine does not crank, refer to «Engine Does Not Crank»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__engine-does-not-crank) . If the engine does not run, refer to «Engine Cranks But Does Not Run»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__engine-cranks-but-does-not-run) .
11. REMAINING DTC REVIEW-Verify there are no other DTCs set. If other DTCs are set, diagnose them in the order listed below. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . Voltage DTCs Programming, Setup, Configuration or Software Performance DTCs Component related DTCs System related DTCs Any remaining DTCs
12. EMISSION RELATED INSPECTION/MAINTENANCE TESTING CONCERNS-If inspection and maintenance checks are required in your region, verify the customer concern is not related to inspection/maintenance testing. If the customer concern is related to inspection/maintenance testing, refer to «Inspection/Maintenance System Check»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__inspectionmaintenance-system-check) .
13. SYMPTOM DIAGNOSIS-Diagnose any remaining customer concern. Refer to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

Emissions Related DTCs

Action Taken When the DTC Sets - Type A

1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Action Taken When the DTC Sets - Type B

1. The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

1. The following applies to misfire DTCs: If the control module detects a low level or an emission level misfire condition during 2 consecutive trips, the control module illuminates the MIL. If the control module detects a high level or catalyst damaging misfire, the control module flashes the MIL at a rate of once per second. If the control module detects a misfire during 2 non-consecutive trips, the stored conditions are compared with the current conditions. The control module illuminates the MIL when the following conditions occur: The engine load is within 20 percent of the previous test that failed. The engine speed is within 375 RPM of the previous test that failed. The engine coolant temperature is in the same range of the previous test that failed.
2. The following applies to fuel trim DTCs: If the control module detects a fuel trim condition during 2 consecutive trips, the control module illuminates the MIL. If the control module detects a fuel trim condition during 2 non-consecutive trips, the stored conditions are compared with the current conditions. The control module illuminates the MIL when the following conditions occur: The engine load is within 20 percent of the previous test that failed. The engine speed is within 375 RPM of the previous test that failed. The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC - Type A or Type B

1. The control module turns OFF the MIL after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

Non-Emissions Related DTCs

Action Taken When the DTC Sets - Type C

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The MIL will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC - Type C

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Diagnostic Trouble Code (DTC) List - Vehicle

This master DTC list includes all applicable DTCs in alphanumeric order with descriptors.

Diagnostic Trouble Code (DTC) List - Vehicle

Body Systems

1. «Symptoms - Fixed and Moveable Windows»(/buick/regal/v-2009-2013/remont/heated-glassdefoggers/#fixed-and-moveable-windows)
2. «Symptoms - Horns»(/buick/regal/v-2009-2013/remont/horns/#horn-system__symptoms-horns)
3. «Symptoms - Lighting»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system__symptoms-lighting)
4. «Symptoms - Mirrors»(/buick/regal/v-2009-2013/remont/mirrors/#mirror-system__symptoms-mirrors)
5. «Symptoms - Vehicle Access»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems__symptoms-vehicle-access)
6. «Symptoms - Wiper/Washer Systems»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system__symptoms-wiperwasher-systems)

Brakes

1. «Symptoms - Antilock Brake System»(/buick/regal/v-2009-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «Symptoms - Park Brake»(/buick/regal/v-2009-2013/remont/parking-brake-system/#parking-brake-system__symptoms-park-brake)

Driveline/Axle

Symptoms - Wheel Drive Shafts

Driver Information and Entertainment

1. «Symptoms - Cellular Communication»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__symptoms-cellular-communication)
2. «Symptoms - Secondary and Configurable Customer Controls»(/buick/regal/v-2009-2013/remont/memory-modules/#secondary-and-configurable-customer-control-system__symptoms-secondary-and-configurable-customer)
3. «Symptoms - Displays and Gauges»(/buick/regal/v-2009-2013/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges__symptoms-displays-and-gauges)
4. «Symptoms - Entertainment»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__symptoms-entertainment)

Engine

1. «Symptoms - Cruise Control»(/buick/regal/v-2009-2013/remont/cruise-control-systems/#cruise-control-system__symptoms-cruise-control)
2. «Symptoms - Engine Controls»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.0L engine
3. «Symptoms - Engine Controls»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-dtc-p0411-luk-to-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.2L or 2.4L engine
4. «Symptoms - Engine Electrical»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid__symptoms-engine-electrical)
5. «Symptoms - Engine Electrical»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-hybrid-hp6__symptoms-engine-electrical) hybrid (HP6)
6. «Symptoms - Engine Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust)
7. «Symptoms - Engine Cooling»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system)
8. «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) for the 2.0L engine
9. «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-24l) for the 2.2L or 2.4L engine

General Information

Symptoms - Vibration Diagnosis and Correction

HVAC

Symptoms - HVAC Systems - Automatic

Hybrid/EV

Symptoms - Hybrid Controls

Power and Signal Distribution

1. «Symptoms - Data Communications»(/buick/regal/v-2009-2013/remont/communication-devices/#data-communications-system__symptoms-data-communications)
2. «Symptoms - Power Outlets»(/buick/regal/v-2009-2013/remont/body-electrical/#power-outlets)
3. «Symptoms - Wiring Systems»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__symptoms-wiring-systems)

Roof

Symptoms - Roof

Safety and Security

1. «Symptoms - Immobilizer»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#immobilizer-system__symptoms-immobilizer)
2. «Symptoms - Object Detection»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system__symptoms-object-detection)
3. «Symptoms - Remote Functions»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#keyless-entry-system-and-remote-functions__symptoms-remote-functions)
4. «Symptoms - Seat Belts»(/buick/regal/v-2009-2013/remont/restraints-control-systems/#seat-belt-system__symptoms-seat-belts)
5. «Symptoms - SIR»(/buick/regal/v-2009-2013/remont/airbag/#supplemental-inflatable-restraint-system__symptoms-sir)
6. «Symptoms - Theft Deterrent»(/buick/regal/v-2009-2013/remont/door-locks-anti-theft-systems/#theft-deterrent-system__symptoms-theft-deterrent)

Seats

1. «Symptoms - Power Seats»(/buick/regal/v-2009-2013/remont/seats/#power-seat-system__symptoms-power-seats)
2. «Symptoms - Seat Heating and Cooling»(/buick/regal/v-2009-2013/remont/seats/#seat-heating-system-and-seat-cooling-system__symptoms-seat-heating-and-cooling)

Steering

1. «Symptoms - Power Steering System»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Symptoms - Steering Wheel and Column»(/buick/regal/v-2009-2013/remont/steering-column-switches/#steering-wheel-and-steering-column__symptoms-steering-wheel-and-column)

Suspension

1. «Symptoms - Suspension General Diagnosis»(/buick/regal/v-2009-2013/remont/suspension-front/#suspension-system-general-diagnosis__symptoms-suspension-general-diagnosis)
2. «Symptoms - Tire Pressure Monitoring»(/buick/regal/v-2009-2013/remont/warning-system/#tire-pressure-monitoring-system__symptoms-tire-pressure-monitoring)

Transmission

1. «Symptoms - Manual Transmission»(/buick/regal/v-2009-2013/remont/manual-trans/#manual-transmission-f40__symptoms-manual-transmission) for the F40 transmission
2. «Symptoms - Automatic Transmission»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-diagnostic-information-and-procedures__symptoms-automatic-transmission) for the 6T30/6T40/6T45/6T50 transmission
3. «Symptoms - Automatic Transmission»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-af40-6__symptoms-automatic-transmission) for the AF40-6 transmission
4. «Symptoms - Automatic Transmission Shift Lock Control»(/buick/regal/v-2009-2013/remont/automatic-trans/#shift-lock-control-system__symptoms-automatic-transmission-shift-lock)
5. «Symptoms - Clutch»(/buick/regal/v-2009-2013/remont/clutches-manual-hydraulic/#manual-transmission-clutch-system)

Engine Does Not Crank

Refer to the appropriate diagnostic procedure below for the symptom observed.

1. «Starter Solenoid Does Not Click»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid)
2. «Starter Solenoid Clicks, Engine Does Not Crank»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid)
3. «Engine Cranks Slowly»(/buick/regal/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system-non-hybrid)

Engine Cranks But Does Not Run

Refer to the appropriate diagnostic procedure below for the vehicle being served.

1. «Engine Cranks But Does Not Run»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.0L engine
2. «Engine Cranks But Does Not Run»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-dtc-p0411-luk-to-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.2L or 2.4L engine

Inspection/Maintenance System Check

Refer to the appropriate diagnostic procedure below for the vehicle being served.

1. «Inspection/Maintenance System Check»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.0L engine
2. «Inspection/Maintenance System Check»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-dtc-p0411-luk-to-dtc-p2635-and-symptom-troubleshooting-diagnosis) for the 2.2L or 2.4L engine

Diagnostic Repair Verification

Note. After a repair has been made, some DTCs require the ignition to be turned OFF then back ON before the scan tool function will clear the DTC.

1. Ignition OFF.
2. Install any components or connectors that have been removed or replaced during diagnosis.
3. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
4. Ignition ON.
5. Clear the DTCs.
6. Turn the ignition OFF for 60 seconds.
7. 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»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) 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 or another symptom is present, return to «Symptoms - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) and perform the appropriate symptom diagnostic.

See also:
• Customer Concern Verification Sheets
• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing
• Battery Inspection/Test
• Power Distribution Schematics
• Electrical Center Identification Views
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Checking Aftermarket Accessories
• Scan Tool Does Not Power Up
• Power Mode Mismatch
• Data Link References
• DTC B0000
• DTC B0000
• DTC B0012 or B0013
• DTC B0163
• DTC B0283
• DTC B0550
• DTC B0685
• DTC B0958, B0959, B0960, or B0961
• DTC B096A
• DTC B1325, B1330, B1420, B1424, B1517, C0800, C0895, C0899, C0900, C12E1, C12E2, P0560, P0562, or P0563
• DTC B1474
• DTC B1925 or B2170
• DTC B270A
• DTC B2750
• DTC B2955 (with BTM)
• DTC B3006
• DTC B3101
• DTC B3622
• DTC B3664
• DTC B3715 or B3875
• DTC B3794
• DTC C0000
• DTC C005B
• DTC C0267
• DTC C028A
• DTC C0569
• DTC P0010 or P0013
• DTC P0010 or P0013
• DTC P0340 or P0365
• DTC P0411 (LUK)
• DTC P0480, P0481, P0691, P0692, P0693, or P0694 (LHU)
• DTC P0562 or P0563
• DTC P057B-P057E
• AUTOMATIC TRANSMISSION - AF40-6
• DTC P0806-P0808
• Drive Motor Battery Cooling Blower Malfunction - DTC P0A81-P0A85 or P0D64-P0D66
• Symptoms - Horns
• Symptoms - Lighting
• Symptoms - Mirrors
• Symptoms - Vehicle Access
• Symptoms - Wiper/Washer Systems
• Symptoms - Park Brake
• Symptoms - Wheel Drive Shafts
• Symptoms - Cellular Communication
• Symptoms - Secondary and Configurable Customer Controls
• Symptoms - Displays and Gauges
• Symptoms - Entertainment
• Symptoms - Cruise Control
• Symptoms - Engine Electrical
• Symptoms - Engine Electrical
• Symptoms - Engine Exhaust
• Symptoms - Engine Mechanical
• Symptoms - Engine Mechanical
• Symptoms - Vibration Diagnosis and Correction
• Symptoms - HVAC Systems - Automatic
• Symptoms - Hybrid Controls
• Symptoms - Data Communications
• Symptoms - Power Outlets
• Symptoms - Wiring Systems
• Symptoms - Roof
• Symptoms - Immobilizer
• Symptoms - Object Detection
• Symptoms - Remote Functions
• Symptoms - Seat Belts
• Symptoms - SIR
• Symptoms - Theft Deterrent
• Symptoms - Power Seats
• Symptoms - Seat Heating and Cooling
• Symptoms - Steering Wheel and Column
• Symptoms - Suspension General Diagnosis
• Symptoms - Tire Pressure Monitoring
• Symptoms - Manual Transmission
• Symptoms - Automatic Transmission
• Symptoms - Automatic Transmission
• Symptoms - Automatic Transmission Shift Lock Control
• Symptoms - Clutch
• Diagnostic System Check - Vehicle
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic Repair Verification
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Does Not Crank
• Engine Cranks But Does Not Run
• Inspection/Maintenance System Check
• Diagnostic System Check Instructions