C1255 — ABS Inlet Valve Coil RR Circuit Open #

The description of this diagnostic trouble code (DTC) may vary depending on the vehicle manufacturer. Always refer to your vehicle’s OEM (Original Equipment Manufacturer) documentation for exact terminology.

Known variations of the DTC label:

• ABS Inlet Valve Coil RR Circuit Open (Generic / Toyota / Lexus / GM / Ford)
• ABS Right Rear Inlet Valve Solenoid Circuit Open (Honda)
• ABS RR Inlet Valve Solenoid Open Circuit (Nissan / Infiniti)

Summary of code C1255 #

C1255 is a trouble code related to the Anti-lock Braking System (ABS), specifically indicating an electrical issue with the right rear (RR) inlet valve coil. The ABS is a safety feature designed to prevent wheel lockup during braking by rapidly modulating brake pressure. When the ABS control module detects an open circuit—meaning a disconnection or a break—in the wiring or coil of the right rear inlet valve, it triggers the C1255 code. This interruption impairs the ABS system’s ability to manage brake pressure at that specific wheel. As a result, ABS functionality may be reduced or disabled, but normal braking is often retained.

Frequent symptoms for code C1255 #

When the C1255 code is present, your vehicle may exhibit several telltale signs. While basic braking remains, ABS-specific features are compromised, especially during slippery conditions. Typical symptoms include:

• ABS warning light illuminated on the dashboard
• Loss of ABS function (no anti-lock during hard braking)
• Traction or stability control warning lamps may also light up
• Possible activation of a failsafe or limp mode for brake electronics
• No noticeable difference in normal braking under light/medium conditions

Probable causes for code C1255 #

The C1255 code is most often caused by electrical issues in the ABS right rear inlet valve circuit. While some causes are more frequent than others, pinpointing the exact root requires careful diagnostic steps. The most common causes, in order of likelihood, are:

1. Open or broken wiring harness between the ABS module and the right rear inlet valve
2. Faulty right rear ABS inlet valve solenoid (the electromagnetic valve that controls brake fluid flow)
3. Corroded or loose electrical connectors at the ABS module or at the valve itself
4. Blown fuse in the ABS circuit (less common, but possible)
5. Damaged ABS electronic control module (rare)

Step-by-step diagnostic for code C1255 #

Diagnosing C1255 requires a systematic approach to rule out the most common faults. A digital multimeter, scan tool, and wiring diagram are helpful. Follow these steps:

• Verify the code with a scan tool and clear it; see if it returns immediately.
• Inspect the right rear ABS wiring harness and connectors for visible damage, corrosion, or disconnection.
• Check for proper voltage and ground at the inlet valve coil connector using a multimeter.
• Test the resistance of the inlet valve solenoid; compare readings to OEM specifications.
• If wiring and solenoid are good, check for continuity between the ABS module and the valve connector—look for open circuits.
• If all else checks out, inspect the ABS module for internal faults or have it bench-tested by a specialist.

Possible repairs for code C1255 #

Repairing C1255 involves addressing whatever fault was identified during diagnosis. Depending on the root cause, the following repairs may be required:

• Repair or replace damaged or broken wiring in the right rear ABS circuit
• Replace a faulty right rear ABS inlet valve solenoid
• Clean or tighten corroded/loose connectors and ensure proper connections
• Replace any blown fuses dedicated to the ABS circuit
• In rare cases, repair or replace the ABS control module (preferably with an OEM part)

Is it safe to drive with code C1255? #

Driving with code C1255 is possible, but with limitations. Normal braking will usually remain unaffected, so you can operate the vehicle with caution. However, ABS will not function, meaning the wheels may lock up under hard or emergency braking, especially on slippery surfaces. If weather or driving conditions are poor, or if you rely on ABS for safety, it’s best to have the issue repaired promptly. Avoid aggressive driving until the problem is resolved.

Vehicles most affected by code C1255 #

While C1255 can appear on many vehicles equipped with ABS, it is more frequently reported on certain makes and models, particularly those using similar ABS module designs. Models often affected include:

• Toyota Camry, Corolla, RAV4, Highlander
• Lexus ES, RX, IS
• Chevrolet Silverado, Tahoe
• Ford F-150, Explorer
• Honda Accord, CR-V
• Nissan Altima, Rogue

Common mistakes and best practices for code C1255 #

When dealing with C1255, certain pitfalls can prolong repairs or lead to unnecessary parts replacement. To avoid wasted time and money, keep these practices in mind:

• Do not replace the ABS module without first ruling out wiring or solenoid faults—the module is rarely the culprit
• Avoid resetting the code without addressing the underlying issue; it will likely return
• Use OEM wiring diagrams to trace circuits and confirm pinouts
• Always check connectors for corrosion or loose pins—they are a frequent cause of open circuits
• After repairs, clear the code and perform a test drive to confirm resolution

Quick FAQ for code C1255 #

Addressing common owner and technician questions:

• Q: Can I fix C1255 myself?
  A: If you are comfortable with basic electrical testing and have access to wiring diagrams, many causes (like damaged wires or connectors) can be fixed at home. However, solenoid or module replacement may require professional tools.
• Q: Will disconnecting the battery clear the code?
  A: No, disconnecting the battery may temporarily clear warning lights, but the code will return as soon as the module re-detects the fault. Always diagnose and repair the root cause first.