Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the C1285 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
The Active Brake Booster has internal solenoids that assist driver brake applications or that can apply the brakes when needed if the driver loses control. Voltage is supplied to the solenoid from the Anti-Lock Brake System (ABS) Module and ground is provided back to the ABS module.
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