What Does C1202 Mean?
The ABS module has detected a general circuit failure in the rear outlet valve solenoid coil. On vehicles with a three-channel ABS system, the rear outlet valve controls pressure release for both rear wheels simultaneously during ABS events. The ABS warning light will be on and ABS function is disabled. The driver may notice longer stopping distances on slippery surfaces.
Common Causes
35%
Internal failure of the rear outlet valve solenoid coil inside the ABS hydraulic modulator assembly
30%
Wiring harness damage between the ABS module and the rear outlet valve solenoid circuit
20%
Poor connection or corrosion at the ABS modulator electrical connector affecting the rear valve circuit pins
15%
ABS control module internal driver circuit failure for the rear outlet valve
Diagnostic Steps
1
Check for additional ABS codes. Multiple rear valve codes suggest a common connector or wiring issue, while a single code points to the specific valve or its dedicated circuit.
2
Disconnect the ABS modulator connector and measure the rear outlet valve solenoid coil resistance. Specification is typically 3-6 ohms. Compare with other valve coil readings for consistency.
3
Inspect the modulator connector for water intrusion, corrosion, or pin damage. The rear valve circuit pins should be identified from the vehicle wiring diagram.
4
Perform a continuity check on each rear outlet valve wire from the ABS module connector to the modulator connector. Repair any opens or high-resistance connections.
5
If the solenoid coil is out of specification, replace the ABS hydraulic modulator assembly. Bench bleed and follow the manufacturer's bleed procedure.
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 outlet valve solenoid coil. On vehicles with a three-channel ABS system, the rear outlet valve controls pressure release for both rear wheels simultaneously during ABS events. The ABS warning light will be on and ABS function is disab...
The most common cause of C1202 (ABS Outlet Valve Coil Rear Circuit Failure) is: Internal failure of the rear outlet valve solenoid coil inside the ABS hydraulic modulator assembly
Typical repair costs for C1202 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 for the rear axle (and likely the entire system). Rear wheel lockup during hard braking can cause the vehicle to become unstable or fishtail. Use extra caution and avoid hard braking until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1202 to identify the root cause.
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Quick Info
Category
Chassis
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ABS / Traction Control
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