Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
This is typically an electrical wiring connection issue at / or inside the Anti-Lock Brake Control Module being monitored by the manufacturer.
It can occur if:
The large cable from the alternator to the battery has a wiring issue.
The wrong software is being used on the code scanner.
To diagnose the C1200 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
If the ABCM \ EBCM finds higher than normal voltage to the left front inlet valve solenoid after the ignition switch is first turned to the “Run” position, code C1200 is set in memory.
When the driver stops too fast, and one or more wheels begin to lock up, the ABS system takes over. It sees the wheel or wheels slowing down too rapidly by way of wheel speed sensors. When this happens, it shuts off brake fluid to the wheel with the inlet valve/coil, and releases the pressure with an outlet valve/coil. The ABS Inlet Valve Coil Left Front is typically found on vehicles with 4 Wheel Anti-Lock Brakes. The ABS system checks to be sure that the coil electrical circuit is ok every time the key is turned on and the ABS module is powered up. If there is a problem with the wiring to the coil or the coil itself, the ABS module will communicate over a data bus to the instrument cluster to turn on the amber Anti-Lock Light and the Red Brake Warning Light, and ABS will be disabled. In this case, the module has checked the wiring to the left front inlet valve and has found battery voltage when it should have much less. This sets a C1200 in memory.
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