P0562

DTC P0562





Circuit Description
The transmission control module (TCM) continuously monitors the system voltage on the Ignition 1 circuits. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal damage.

When the TCM detects low voltage, DTC P0562 sets. DTC P0562 is a type A DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P0562 System Voltage Low

Conditions for Running The DTC
^ No engine speed signal DTC P0727
^ No communications DTC U2104 or U0100
^ Trans. Protection Mode is OFF.
^ Transmission input shaft speed is greater than 400 RPM.

Conditions for Setting The DTC
The TCM detects system voltage is 8.68 volts or less for 20 seconds.

Action Taken When the DTC Sets
^ The TCM requests the powertrain control module (PCM) to illuminate the malfunction indicator lamp (MIL).
^ The TCM turns the Trans. Protection Mode ON.
^ The transmission will operate in 5th gear when the transmission is shifted into D and 2nd gear when shifted into L.
^ The line pressure is at maximum.
^ The torque converter clutch (TCC) is disabled.
^ The TCM freezes the transmission adaptive functions.
^ The PCM records the operating conditions when the Condition for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P0562 in TCM history.

Conditions for Clearing the MIL/DTC
^ The TCM turns OFF the MIL request during the third consecutive trip in which the diagnostic test runs and passes.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.

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

Step 1 - Step 8:

Step 9 - Step 14:

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.