DTC P0562. Buick LaCrosse 2008

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2008 🢒 LaCrosse 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P0562

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.

Diagnostic Fault Information

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

The engine control module (ECM) monitors the system 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.

Conditions for Running the DTC

•	The vehicle speed is above 8 km/h (5 mph).

•	The system voltage is between 9.5-18 volts.

Conditions for Setting the DTC

The ECM detects a system voltage below 10 volts for 5 seconds.

Action Taken When the DTC Sets

•	The instrument panel cluster (IPC) illuminates the charge indicator.

•	The driver information center (DIC) displays the CHARGING SYSTEM / GENERATOR FAULT warning message.

Conditions for Clearing the DTC

DTC P0562 is a C type DTC.

Diagnostic Aids

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

•	Inspect the ECM ground connections, to verify that they are clean and tight.

Reference Information

Schematic Reference

•	Engine Controls Schematics for the 3.6L engine.

•	Engine Controls Schematics for the 5.3L engine.

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

Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.5 volts.

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

Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 volts.

Circuit/System Testing

Ignition OFF, disconnect the harness connectors at the ECM.
Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminals listed below and ground:

•	3.6L engine CASE GROUND

•	5.3L engine terminal 73 X2

⇒	If greater than the specified value, test the ground circuits for an open/high resistance.

Ignition ON, verify a test lamp illuminates between the IGN / B+ circuits terminals listed below and ground.

•	IGN 3.6L engine terminal 1 X2

•	IGN 3.6L engine terminal 3 X2

•	IGN 3.6L engine terminal 17 X2

•	B+ 3.6L engine terminal 36 X2

•	IGN 5.3L engine terminal 18 X1

•	IGN 5.3L engine terminal 19 X1

•	IGN 5.3L engine terminal 13 X2

•	B+ 5.3L engine terminal 20 X1

⇒	If the test lamp does not illuminate , test the IGN / B+ circuits for an open/high resistance.

If the circuits test normal replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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