P0563

P0563-BATTERY VOLTAGE HIGH





For complete wiring diagrams refer to Diagrams/Electrical.


- When Monitored:

With the key on or the engine running.

- Set Condition:

The battery voltage detected by the ECM is greater than a calibrated value.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test


1. P0622 PRESENT

With the scan tool, read DTCs.

Is P0622 set?

Yes

- Repair P0622 first.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 2

2. P2502 PRESENT

With the scan tool, read DTCs.

Is P2502 set?

Yes

- Repair P2502 first.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 3

3. P2504 PRESENT

With the scan tool, read DTCs.

Is P2504 set?

Yes

- Repair P2504 first.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 4

4. BATTERIES IMPROPERLY INSTALLED





Disconnect the ECM harness connectors.

Measure the battery voltage between the positive circuits and ground of the ECM harness connector.

Is the voltage less than 19 volts?

Yes

- Go To 5

No

- Install the battery system correctly.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. ECM





Reconnect the battery terminals.

Measure and record the voltage between battery positive pins of the ECM connector and the battery negative circuits of the ECM harness connector.

Reconnect the ECM harness connectors.

Use the scan tool to measure and record battery voltage.

Are the readings within 3 volts of each other?

Yes

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition

No

- Replace the ECM.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test