5L40-E / 5L50-E Automatic Transmission
DTC P0562
Circuit Description
The transmission control module (TCM) continuously monitors the system voltage on the ignition 1 and the battery circuits. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation and tie-up conditions, which may result in internal damage.
When the TCM detects low voltage, DTC P0562 sets. DTC P0562 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0562 System Voltage Low
Conditions for Running The DTC
The engine speed is greater than 1,200 RPM.
Conditions for Setting The DTC
The TCM detects system voltage less than 11 volts for 10 seconds.
Action Taken When the DTC Sets
* The TCM does not request the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
* The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM records this information as a Failure Record.
* The TCM stores DTC P0562 in TCM history.
Conditions for Clearing the DTC
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
* A scan tool can clear the DTC.
Diagnostic Aids
* Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
* Inspect for the following conditions:
- Loose or damaged terminals at the generator
- Loose or worn generator drive belt
Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the charging system voltage with a nominal load.
5. This step obtains the ignition voltage measurement reported by the TCM.
6. This step tests the voltage drop from the battery and ignition voltage input at the TCM.
10. This step tests the voltage drop from the ground terminals of the TCM to the ground terminal of the battery.
