ABS/VSC Code C1247: RR Outlet Valve Open
Diagnostic trouble code C1247 indicates that the ABS/VSC control module has detected an open circuit in the outlet valve solenoid coil for the right rear (RR) hydraulic circuit. This solenoid controls brake pressure release at the right rear wheel during ABS activation. An open circuit prevents the valve from operating, disabling anti-lock braking and often stability control (VSC/TRAC) for that wheel.
1. Commonly Affected Makes
2. Most Common Causes
- Open circuit in the right rear outlet valve solenoid coil (internal damage)
- Damaged, corroded, or disconnected wiring or connector at the RR solenoid
- Internal failure of the ABS hydraulic control unit (HCU)
- Faulty output driver in the ABS ECU (rare)
3. Symptoms You Will Notice
- ABS warning light illuminated
- VSC/TRAC warning light illuminated
- Possible loss of ABS function at right rear wheel
- Potential loss of stability control
4. Step-by-Step Diagnosis
Scan for codes and verify C1247 is present
Inspect wiring and connector at the RR solenoid for damage, corrosion, or loose connection
Measure resistance of the RR outlet valve solenoid coil; compare to specifications (typically 5-20 ohms)
If resistance is out of range or open, replace the HCU or the solenoid assembly as required
If wiring and solenoid are okay, suspect internal ECU fault; test or replace ABS module
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is not recommended because ABS and stability control may be compromised, especially in slippery conditions. Have the vehicle inspected promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the issue is wiring repair or HCU replacement. Labor and parts vary by vehicle.