C2100–BATTERY VOLTAGE LOW

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
If the Anti-Lock Brakes Module detects system voltage is below 9.5 volts.

Possible Causes

ECM OR PCM DTCs PRESENT

VEHICLE BATTERY / CHARGING SYSTEM

ANTI-LOCK BRAKES MODULE

Diagnostic Test

1. DTCS IN THE PCM

NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.
With the scan tool, read and record DTCs from the PCM.
With the scan tool, read and record Freeze Frame information.
With the scan tool, erase DTCs.
Start the engine.
With the scan tool, read and record DTCs.
With the scan tool read DTCs from the PCM.

Are any charging system codes present?

Yes

Repair the charging system DTC in the PCM.

Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).

No

Go To 2

2. CHARGING SYSTEM FAILURE

Start the engine.
Connect voltmeter to vehicle battery.

Is the vehicle battery voltage under 10 volts?

No

Perform the ABS Intermittent Condition diagnostic procedure in this Section.

Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

Yes

Repair the charging system per service information.
Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).