ABS Inlet Valve Circuit Open
The C1207 code indicates that the Skid Control ECU has detected an open circuit in the inlet valve coil of the rear (typically right rear) hydraulic circuit in the ABS actuator. This prevents the ECU from modulating brake pressure at that wheel during ABS or stability control (VSC/TRC) events, causing these systems to disable and illuminating the corresponding warning lights.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged rear inlet valve coil in the ABS actuator (internal open circuit)
- Wiring or connector between the brake ECU and ABS actuator shorted to ground, open, or with high resistance
- Loose, corroded, or bent terminals in the ABS actuator connector
- Internal failure of the Skid Control ECU valve driver
3. Symptoms You Will Notice
- ABS warning light on
- VSC/TRAC warning lights on
- ABS and stability control systems disabled
- Possible loss of brake assist during hard braking
4. Step-by-Step Diagnosis
Scan for codes and verify C1207 is present
Inspect the ABS actuator connector and wiring for damage, corrosion, or loose terminals
Measure resistance of the rear inlet valve coil at the actuator connector (spec: typically 5-15 ohms); if open, replace actuator
Check for continuity and shorts in wiring between ECU and actuator; repair as needed
If wiring and actuator are good, suspect Skid Control ECU failure and replace
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The ABS and stability control systems are disabled, increasing the risk of wheel lockup and loss of vehicle control during emergency braking or slippery conditions. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on the cause. A new ABS actuator can cost $300-$600 plus labor, while wiring repairs may be $100-$300. ECU replacement is on the higher end.