Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0562: System Voltage LowDTC P0563: System Voltage High
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | P2534 | P2534 | -- | P0562, P0563 |
Ignition 0 Voltage | -- | -- | -- | P0562, P0563 |
Battery Positive Voltage | -- | -- | -- | P0562, P0563 |
Typical Scan Tool Data
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running in Park, normal operating temperature Parameter Normal Range: 12.5-14.5 volts | |||
Ignition Voltage | 0 volts | 0 volts | 12.5-14.5 volts |
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the ignition voltage circuit.
Conditions for Running the DTC
P0562
The engine speed is 1,200 RPM or greater for 5 seconds.
P0563
The ignition is ON.
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 11 volts or less for 10 seconds.
P0563
The TCM detects system voltage is 18 volts or greater for 10 seconds.
Action Taken When the DTC Sets
DTCs P0562 and P0563 are type C DTCs.
Conditions for Clearing the DTC
DTCs P0562 and P0563 are type C DTCs.
Diagnostic Aids
| • | Observe the driver information center (DIC) messaging that would indicate the electrical system requires service. |
| • | Inspect for loose or damaged terminals at the generator. |
| • | Inspect for loose or worn generator drive belt. |
| • | Use the scan tool in order to inspect all other modules for voltage related DTCs. |
| • | Running the engine with a battery charger attached may cause DTC P0563 to set. |
| • | Inspect the charging circuit for high resistance. |
| • | Inspect the vehicle battery for open or sulfated cells. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12 and 14.5 volts.
- Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12 and 14.5 volts.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
| ⇒ | If not within the specified range, refer to Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the TCM.
- Test for less than 10 ohm between the ground circuit terminal 49 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 32 and ground.
- Verify that a test lamp illuminates between the ignition circuit terminals listed below and ground:
- If all circuits test normal, replace the TCM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| • | Terminal 11 |
| • | Terminal 31 |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for TCM replacement, setup, and programming
