Parking Lamp Circuit Low Voltage
The body control module (BCM, FEM, or SJB depending on the platform) has detected an abnormally low voltage on the parking lamp input circuit, consistent with a short to ground. This circuit is monitored to verify the status of the parking lamps; when the signal remains near 0 volts longer than calibrated, the DTC is set. The condition prevents proper feedback of the parking light circuit status to the control module.
1. Commonly Affected Makes
2. Most Common Causes
- Short to ground in the parking lamp circuit wiring between the switch, lamps, and control module.
- Corroded, bent, or moisture-contaminated connectors or terminals creating a ground path.
- Multi-function switch with internal short to ground in the parking lamp branch.
- Body control module (BCM/FEM/SJB) with internal detection or voltage reference failure.
3. Symptoms You Will Notice
- Parking lamps may not illuminate or may stay on constantly.
- Warning light on the dashboard for exterior lights.
4. Step-by-Step Diagnosis
Inspect parking lamp bulbs and sockets for damage or corrosion.
Check wiring and connectors for shorts to ground using a multimeter.
Test the multi-function switch for internal shorts.
Verify BCM operation and voltage reference.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but parking lamps may not function properly, reducing visibility at night. Repair is recommended soon.
How much does it cost to fix?▼
Typically $100 to $300 depending on the cause and labor rates.