P0563-BATTERY/SYSTEM VOLTAGE HIGH
For a complete wiring diagram, refer to the Wiring Information.
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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 an engine speed greater than 2000 RPM for a least 60 seconds.
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When Monitored:
Continuously with the ignition on.
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Set Condition:
When the monitored battery voltage rises above 16.9 volts.
Possible Causes |
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| CHARGING SYSTEM OVERCHARGE CONDITION |
| JUMP START OFF A 24 VOLT SYSTEM |
| TRANSMISSION CONTROL MODULE (TCM) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
1. CHECK FOR CHARGING SYSTEM DTCS
| 1. | With the scan tool, read PCM DTCs. |
| NOTE: | This includes any one trip faults. |
Are there any PCM Charging System DTCs present?
Yes
- (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.
No
- Go To 2
2. CHECK IF VOLTAGE IS GREATER THAN 16.9 VOLTS
| 1. | Start the engine and raise the engine speed to 2000 RPM. |
| 2. | 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
| 1. | 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 the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
- Go To 5
| 1. | Start the engine and raise the engine speed to 2000 RPM. |
| 2. | With the scan tool, read the Transmission system voltage. |
| 3. | With a voltmeter, measure the battery voltage at the battery. |
| 4. | 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 DTC Based Diagnostics and perform the appropriate diagnostic procedure.
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 in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Transmission Control - Description) .
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
5. CHECK THE WIRING AND CONNECTORS
| 1. | The conditions necessary to set this DTC are not present at this time. |
| 2. | Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. |
| 3. | Wiggle the wires while checking for shorted and open circuits. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No