DTC P1558 Buick
Electronic Trailer Brake Control Output
Electronic Trailer Brake Control Output
Description
The Integrated Trailer Brake Module (ITBM) communicates with the vehicle through the high speed CAN C bus. The ITBM monitors the Brake Pedal Status, Vehicle Speed and ESP status via CAN message. It also outputs the Trailer Status, Gain Setting, and Trailer Brake Output Power to the vehicle. The ITBM connects to the electric trailer brakes through the 7-Way connector and controls the brake force through a Pulse Width Modulating (PWM) duty cycle.
Cause and Solution
TRAILER WIRING BRAKES(F943) IGNITION RUN START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE(A115) FUSED (B+) CIRCUIT OPEN OR HIGH RESISTANCE(Z905) GROUND CIRCUIT(S) OPEN OR HIGH RESISTANCEINTEGRATED TRAILER BRAKE MODULE (ITBM)
Video Guide
Diagnostic Info
- DTC Code: P1558
- Brand: Buick