What Does C1255 Mean?
The ABS control module has detected an open circuit in the right rear ABS inlet valve coil. There is a complete break in the electrical path to the valve solenoid, preventing the module from energizing the valve to hold brake pressure during ABS activation at the right rear wheel.
Safety Warning
ABS inlet valve at the right rear cannot be energized. Anti-lock braking is disabled at this corner, increasing wheel lockup risk during emergency stops. Repair immediately.
Common Causes
40%
Open winding in the right rear inlet valve coil from thermal degradation or fatigue
25%
Broken internal connection or cold solder joint at the valve coil-to-module interface
20%
Corroded or separated connector pin at the module-to-modulator mating connector
15%
Fractured circuit board trace on the inlet valve driver output
Diagnostic Steps
1
Step 1: Measure right rear inlet valve coil resistance at the ABS module connector. OL reading confirms the open. Normal is 3-6 ohms.
2
Step 2: Separate module from modulator if possible and measure coil resistance directly at modulator terminals to isolate the fault location.
3
Step 3: Inspect connector pins between module and modulator for corrosion, recessed pins, or physical damage.
4
Step 4: Look for evidence of overheating or thermal damage on the ABS module or modulator that could have caused the open.
5
Step 5: Replace the failed component. Bleed the ABS system completely, clear codes, and confirm all valve coil resistances are within specification.
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The ABS control module has detected an open circuit in the right rear ABS inlet valve coil. There is a complete break in the electrical path to the valve solenoid, preventing the module from energizing the valve to hold brake pressure during ABS activation at the right rear wheel.
The most common cause of C1255 (ABS Inlet Valve Coil RR Circuit Open) is: Open winding in the right rear inlet valve coil from thermal degradation or fatigue
Typical repair costs for C1255 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ABS inlet valve at the right rear cannot be energized. Anti-lock braking is disabled at this corner, increasing wheel lockup risk during emergency stops. Repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1255 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS)
Difficulty
Type
Manufacturer
Recommended Tools
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