P0563-BATTERY VOLTAGE HIGH
For a complete wiring diagram Refer to Section 8W
Theory of Operation
The Transmission Control Module (TCM) monitors ignition voltage. The DTC will set and temporary limp-in will be activated, if the monitored battery voltage rises above 16.9 volts. If the voltage drops below 16.4 volts, normal operations is resumed and the TCM will record the DTC as a one trip fault. The DTC will only mature to a full DTC if the voltage rises above 16.9 volts with a engine speed greater than 2000 RPM for a least 60 seconds.
- When Monitored:
Continuously with the ignition on.
- Set Condition:
When the monitored battery voltage rises above 16.9 volts.
| Possible Causes |
| CHARGING SYSTEM OVERCHARGE CONDITION |
| JUMP START OFF A 24 VOLT SYSTEM |
| TRANSMISSION CONTROL MODULE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1. CHECK FOR CHARGING SYSTEM DTCSWith the scan tool, read Engine DTCs.
NOTE: This includes any one trip faults.
Are there any Engine Charging System DTCs present?
Yes
- Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate symptom.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
- Go To 2
2. CHECK IF VOLTAGE IS GREATER THAN 16.9 VOLTS
Start the engine and raise the engine speed to 2000 RPM.
With the scan tool, monitor the Transmission system voltage for at least 60 seconds.
Does the Transmission system voltage read above 16.9 volts for any period of time?
Yes
- Go To 4
No
- Go To 3
3. VERIFY IF VEHICLE WAS JUMP STARTED WITH 24-VOLT SYSTEM
Verify if the vehicle was jump started by another vehicle using a 24-volt charging system.
Was the vehicle jump started by another vehicle using a 24-volt charging system?
Yes
- This is the cause of the DTC. Erase the DTC and return the vehicle to the customer.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
- Go To 5
4. CHECK BATTERY VOLTAGE
Start the engine and raise the engine speed to 2000 RPM.
With the scan tool, read the Transmission system voltage.
With a voltmeter, measure the battery voltage at the battery.
Compare the readings.
Does the voltage readings match between the Transmission scan tool reading and the battery voltmeter reading?
Yes
- Repair the charging system for an over charging condition. Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom as if the DTC is current.
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE for the appropriate service procedures.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
5. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
- Test Complete.