What Does C1254 Mean?
The ABS control module has detected a circuit failure in the right rear ABS inlet valve coil. The inlet valve is responsible for blocking additional brake pressure during ABS events to prevent wheel lockup. This failure means the module cannot hold or reduce brake pressure at the right rear wheel during anti-lock braking.
Safety Warning
Right rear ABS inlet valve is inoperative. ABS braking performance is degraded, and the right rear wheel may lock during hard braking. Repair immediately.
Common Causes
40%
Failed right rear inlet valve coil with open or shorted windings inside the ABS hydraulic control unit
25%
Internal ABS module wiring or circuit board failure at the right rear inlet valve driver
20%
Corroded connector between the electronic module and hydraulic modulator affecting the inlet valve pins
15%
Brake fluid contamination of the valve coil causing insulation breakdown
Diagnostic Steps
1
Step 1: Measure right rear inlet valve coil resistance at the ABS module connector (typical 3-6 ohms). Compare to left rear inlet valve for reference.
2
Step 2: Check for short to ground and short to battery on both valve coil wires. All readings should be OL.
3
Step 3: Inspect the ABS modulator for external damage, corrosion, or brake fluid leaks that may have caused internal damage.
4
Step 4: Perform a bidirectional test commanding the right rear inlet valve on and off. Verify audible solenoid click.
5
Step 5: Replace the failed ABS hydraulic modulator or electronic module. Perform a full ABS brake bleed after replacement. Clear codes and verify during test drive.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The ABS control module has detected a circuit failure in the right rear ABS inlet valve coil. The inlet valve is responsible for blocking additional brake pressure during ABS events to prevent wheel lockup. This failure means the module cannot hold or reduce brake pressure at the right rear wheel du...
The most common cause of C1254 (ABS Inlet Valve Coil RR Circuit Failure) is: Failed right rear inlet valve coil with open or shorted windings inside the ABS hydraulic control unit
Typical repair costs for C1254 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Right rear ABS inlet valve is inoperative. ABS braking performance is degraded, and the right rear wheel may lock during hard braking. Repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1254 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS)
Difficulty
Type
Manufacturer
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