DTC P0562: SYSTEM VOLTAGE LOW Chevrolet Silverado 2500

Note. For circuit identification, see CONNECTOR IDENTIFICATION and WIRING DIAGRAMS .

Circuit Description

The Transmission Control Module (TCM) requires ignition voltage to operate correctly. The voltage signal should be direct from the ignition switch to avoid any interference.

This is a type "C" DTC.

Conditions For Running The DTC

DTC will run under the following condition

1. The components are powered, and ignition voltage is greater than 9 volts and less than 18 volts.
2. The engine speed is greater than 400 RPM for one second.

Conditions For Setting The DTC

DTC will set under the following condition

1. DTC sets when the TCM detects a voltage less than 8 volts for 5 seconds.

Action Taken When The DTC Sets

TCM performs the following actions if DTC is set

1. While diagnostic response is active, if the gearshift lever is moved to a forward gear range, the transmission will shift to Neutral, 3rd, or 5th gear; if the gearshift lever is moved to Neutral, transmission will shift to Neutral; and if the gearshift lever is moved to Reverse, transmission will shift to Neutral or Reverse (fail to range/hydraulic defaults).
2. DTC will be stored in the TCM history.
3. The TCM inhibits TCC engagement.
4. The TCM freezes shift adapts.
5. Illuminates MIL when active.

Conditions For Clearing The DTC

DTC will clear under the following conditions

1. A scan tool can clear the DTC from the TCM history.
2. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

Test Description

The numbers listed below refer to step numbers in the diagnostic procedure

1. 2 This step tests for battery voltage.
2. 4 This step tests the status of the charging system.
3. 6 This step tests charging system voltage.
4. 7 This step tests voltage available at the TCM.