What Does C1206 Mean?
The ABS module has detected a general circuit failure in the rear inlet valve solenoid coil. The rear inlet valve controls brake pressure application to the rear wheels during ABS activation. This fault disables ABS and illuminates the ABS warning lamp. The driver retains normal braking but loses anti-lock protection for the rear wheels.
Common Causes
35%
Internal failure of the rear inlet valve solenoid coil winding inside the ABS hydraulic modulator
30%
Damaged or broken wiring in the harness between the ABS module and the rear inlet valve solenoid circuit
20%
Corroded or damaged connector terminal at the ABS modulator plug on the rear inlet valve circuit
15%
ABS control module internal driver failure for the rear inlet valve output
Diagnostic Steps
1
Check for companion codes. If C1202-C1209 are present together, a common harness or connector issue affecting the entire rear channel is most likely.
2
Disconnect the ABS modulator connector and measure the rear inlet valve solenoid coil resistance (spec: 3-6 ohms). An out-of-spec reading indicates a failed coil.
3
Inspect the modulator connector for pin damage, corrosion, moisture, or contamination. Verify all pins are properly seated and have good retention tension.
4
Perform end-to-end continuity checks on each rear inlet valve wire from the ABS module to the modulator. Wiggle the harness during testing to detect intermittent opens.
5
If the solenoid coil has failed, the entire ABS hydraulic modulator must be replaced and the brake system properly bled.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ABS module has detected a general circuit failure in the rear inlet valve solenoid coil. The rear inlet valve controls brake pressure application to the rear wheels during ABS activation. This fault disables ABS and illuminates the ABS warning lamp. The driver retains normal braking but loses an...
The most common cause of C1206 (ABS Inlet Valve Coil Rear Circuit Failure) is: Internal failure of the rear inlet valve solenoid coil winding inside the ABS hydraulic modulator
Typical repair costs for C1206 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Normal braking is maintained but ABS is disabled. Rear wheel lockup during hard braking can cause vehicle instability, particularly at higher speeds or in curves. Schedule repair as soon as practical.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1206 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
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