P0563-BATTERY VOLTAGE HIGH

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on. Engine RPM greater than 1000 RPM. With no other charging system codes set.
Set Condition:
Battery voltage is one Volt greater than desired voltage for more than 10.0 seconds. Battery voltage greater than 15.75 Volts. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes
(K20) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE
GENERATOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)

NOTE: Make sure the Battery is in good condition. Using the Midtronics Battery Tester, test the Battery before continuing.

NOTE: Inspect the vehicle for after market accessories that may exceed the Generator System output.

NOTE: Make sure the Generator drive belt is in good operating condition.

NOTE: Inspect the fuses in the IPM. If a fuse is open use the wire diagram/schematic as a guide, inspect the wiring and connectors for damage.

1.	Ignition on, engine not running.

2.	With a scan tool, read the active DTCs.

Is the DTC Active at this time?

Yes

Go To 2

Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. GENERATOR OPERATION

1.	Turn the ignition off.

2.	Disconnect the Generator Field harness connector.

3.	Using a 12-Volt test light connected to ground, probe the (K20) Generator Field Control circuit in the Generator Field harness connector.

NOTE: Make sure the test light is probing the circuit before actuating the Relay or a DTC may set and not allow the actuation.

4.	Ignition on, engine not running.

5.	Using the scan tool, actuate the Generator Field Control circuit.

Does the test light illuminate brightly and flash on and off?

Yes

Verify that there is good pin to terminal contact in the Generator and Powertrain Control Module connectors. If OK, replace the Generator.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 3

3. (K20) FIELD CIRCUIT SHORTED VOLTAGE

1.	Turn the ignition off.

2.	Disconnect the PCM C2 harness connector.

3.	Ignition on, engine not running.

4.	Measure the voltage on the (K20) Generator Field Control circuit at the Generator Field harness connector.

Is there any voltage present?

Yes

Repair the short to voltage in the (K20) Generator Field Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 4

4. POWERTRAIN CONTROL MODULE (PCM)

1.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator and the Powertrain Control Module (PCM).

2.	Look for any chafed, pierced, pinched, or partially broken wires.

3.	Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Generator and Powertrain Control Module connectors.

4.	Perform any Technical Service Bulletins that may apply.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control - Removal) .
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

P0563-BATTERY VOLTAGE HIGH

P0563-BATTERY VOLTAGE HIGH

Possible Causes