Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B2602: DRL Control Module Circuit (Short To Ground Or Open): Description
Body Control Module (BCM) interfaces with Daytime Running Light (DRL) control module to allow BCM to determine current ambient light operation mode. BCM uses class 2 serial data line to communicate this information to Instrument Panel Cluster (IPC). BCM uses information from circuit No. 1970 (Pink/White wire) to energize headlights for twilight sentinel feature.
DTC B2602 will set when BCM detects a short to ground or open in circuit No. 1970 (Pink/White wire) when ignition switch is turned from START to RUN position. No driver warning message will be displayed.
When ignition switch is turned from OFF to RUN position, a current DTC is always cleared. If condition for malfunction is still present, DTC will reset as a current DTC. If condition for malfunction no longer exists, history DTC will clear after 100 consecutive ignition cycles. DTC B2602 will also clear when conditions no longer exist or scan tool is used to clear codes.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.