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DTC B151D

DTC B151D

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 B151D 03

Low battery voltage detected

DTC B151D 07

High battery voltage detected

Circuit/System Description

The Body Control Module (BCM) monitors that the battery voltage is within the set interval.

Conditions for Running the DTC

Ignition switch is in the RUN position.

Conditions for Setting the DTC

The Body Control Module (BCM) detects battery voltage lower than 6 V or higher than 18 V for more than 10 seconds.

Activities when the DTC is generated


• A driver information centre (DIC) message is displayed.

• The Body Control Module (BCM) may be temporarily disabled.


Conditions for Clearing the DTC

Battery voltage is once again with the set interval.

Diagnostic help

Possible reasons for this DTC are overcharging with a battery charger or a consumer draining current from the battery.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Inline Harness 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


Scan Tool Reference

Control Module References for scan tool information


Special Tools

• DT 47825-10 - Wiring harness adapter

• DT 47825-20 - Wiring harness adapter

• DT 48616-10 - Wiring harness adapter


For equivalent regional tools, see Special tools .

Circuit/System Verification

Ignition ON; check that no system voltage DTCs are generated.

If a DTC is generated, go to Diagnostic Trouble Code (DTC) List - Vehicle .

Circuit/System Testing


1. Ignition OFF; disconnect the X2 connector from the Body Control Module (BCM).

2. Check that there is 6-18 V between battery voltage circuit pin 1 and ground.

3. If the value is lower, check whether the battery voltage circuit is shorted to ground or is open/has high resistance.

4. If the value is higher, troubleshoot the charging system for an overcharging cause. Go to Charging system test .

5. If the battery voltage circuit is normal, replace the Body Control Module (BCM).


Repair instructions

After completing the diagnostics procedure, carry out Diagnostic Repair Verification .

Control Module References for control module replacement, installation and programming