P0563

Powertrain Control Module System Voltage Circuit:

Circuit Description
The Powertrain Control Module (PCM) monitors the system voltage on the ignition feed terminals to the PCM. A system voltage DTC will set whenever the voltage is above a specified calibrated value.

Conditions For Setting The DTC
The system voltage is greater than 17V.

Action Taken When the DTC Sets
- The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.

Conditions for Clearing the DTC
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTCs can be cleared by using a scan tool.

Diagnostic Aids
Whenever a DTC sets when an accessory is operated, check for a poor connection or excessive current draw.

DTC P0563 - System Voltage High:

Test Description
1. The OBD System Check prompts the Technician to complete some basic checks and store the Failure records on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. This information on the scan tool can be referred to later.
4. Before replacing the PCM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. Replacement PCM must be reprogrammed. Refer to the latest Techline information for programming procedures.