For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC P0563: System Voltage High - ECM

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
B+ | P0562 | P0562 | -- | --
Ground | -- | P0562 | -- | --

### Typical Scan Tool Data

#### Control Module Voltage - ECM

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Ignition ON, Engine OFF. Parameter Normal Value: 12.6 Volts
B+ | 0.0 Volts | 24.1 Volts | 12.6 Volts

### Circuit/System Description

The engine control module (ECM) monitors the battery positive (B+) voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range. If the ECM detects high battery voltage, then DTC P0563 will set.

### Conditions for Running the DTC

• | The engine has been running for 3 minutes.

• | The vehicle speed is greater than 5 km/h (3.1 mph)

### Conditions for Setting the DTC

The ECM detects battery voltage greater than 18.1 volts for 2 seconds.

### Action Taken When the DTC Sets

DTC P0560 is a type C DTC.

### Conditions for Clearing the DTC

DTC P0560 is a type C DTC.

### Diagnostic Aids

• | This DTC could be set by overcharging with a battery charger or jump starting.

• | A high voltage DTC in multiple modules indicates a concern in the charging system.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Charging System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

⇒ | If not within the specified range, refer to Charging System Test.

2. Observe the scan tool ECM Control Module Voltage parameter. The reading should be between 12.6 and 15.0 volts.

⇒ | If greater than the specified range, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.