DTC P166 Ford
DRL Position On Front Light LED Unit Left-Component Internal Failure
DRL Position On Front Light LED Unit Left-Component Internal Failure
Description
The Daytime Running Lamps (DRLs) illuminate when the engine is running, the Parking Brake is released and the Headlamps are off or in the AUTO position. When the Body Control Module (BCM) receives a CAN Bus message from the PCM, indicating the engine is running, a hardwired input from the Headlamp Switch, indicating the Headlamp Switch is Off or in the AUTO position, and a CAN Bus message from the Anti-Lock Brake System (ABS) Module, indicating that the Parking Brake is released, the BCM will provide voltage to the DRLs through the Left and Right DRL Lamp Driver circuits.
Cause and Solution
LEFT FRONT LAMP ASSEMBLY OR BODY CONTROL MODULE (BCM) CONNECTIONSLEFT DRL LAMP DRIVER CIRCUIT SHORTED TO VOLTAGELEFT DRL LAMP DRIVER CIRCUIT SHORTED TO GROUNDLEFT DRL LAMP DRIVER CIRCUIT OPEN OR HIGH RESISTANCEBODY CONTROL MODULE (BCM)LEFT FRONT LAMP ASSEMBLY
Video Guide
Diagnostic Info
- DTC Code: P166
- Brand: Ford