Diagnostic Instructions
DTC Descriptors
DTC P0562: System Voltage Low
DTC P0563: System Voltage High
Circuit/System Description
The transmission control module (TCM) continuously monitors the Battery Positive Voltage. Improper voltage may cause component damage or be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic
transmission operation, which may result in internal damage.
Conditions for Running the DTC
| • | No Engine Speed Circuit Malfunction, P0727 |
| • | No Lost Communications with the ECM, U0100 |
| • | No CAN Bus Reset Counter Overrun, U2104 |
| • | Engine speed is 1200 RPM or greater |
Conditions for Setting the DTC
P0562
The TCM detects that battery voltage is less than 8.68 volts for 20 seconds.
P0563
The TCM detects that battery voltage is greater than 18.0 volts for 20 seconds.
Action Taken When the DTC Sets
| • | DTCs P0562 and P0563 are Type C DTCs. |
| • | The TCM inhibits Adaptive Control. |
| • | The transmission will operate in 5th gear in D or M range, 2nd gear in L range. |
Conditions for Clearing the DTC
DTCs P0562 and P0563 are Type C DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Scan Tool Reference
Control Module References
for scan tool information
Circuit/System Verification
Engine running, verify the transmission control module (TCM) scan tool battery voltage parameter is between 8.68-18.0 volts.
| ⇒ | If not within the specified range, refer to
Charging System Test
before performing Circuit/System Testing. |
Circuit/System Testing
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition OFF, disconnect the C1 harness connector at the transmission control module (TCM).
- Test for less than 1.0 ohm between ground circuit terminal 9 and ground.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the TCM. |
| ⇒ | If all circuits test normal, replace the TCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
