What it means
The ABS module monitors how quickly hydraulic pressure is released from the right rear wheel circuit. It sets this code when pressure release takes longer than the calibrated limit.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
During ABS or stability-control intervention, the ABS hydraulic unit releases pressure from the right rear wheel through its outlet valve. C001E means the module detected pressure release from the right rear circuit taking longer than its calibrated limit, suggesting sluggish valve action or restricted flow.
Common causes
Most likely first.
- Sluggish outlet valve
- Restricted hydraulic passage
- Contaminated brake fluid
- ABS hydraulic unit fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Read ABS codes and freeze-frame data to check whether C001E occurs with right rear wheel, valve, or hydraulic-unit faults.
- Inspect the right rear outlet-valve wiring and connector for damage that could interfere with valve operation.
- Check brake-fluid condition and service history for contamination or overdue replacement.
- Use the manufacturer’s diagnostic procedure to command the right rear outlet valve and verify its electrical response.
- If the electrical response is correct, check the right rear hydraulic passage for restricted flow using the specified procedure.
- Assess the ABS hydraulic unit for an internal valve or passage fault after fluid and circuit checks.
Common fixes
- Repair a damaged connector or wiring fault affecting the right rear outlet valve.
- Replace contaminated brake fluid using the vehicle’s specified service procedure.
- Free or replace the sluggish right rear outlet valve if testing confirms it.
- Repair or replace the ABS hydraulic unit if its right rear passage is restricted.
Can I keep driving?
ABS or stability control may be limited, and pressure at the right rear wheel may not release as expected during an intervention. Avoid hard braking and slippery roads, and arrange prompt diagnosis; stop if braking feels uneven or abnormal.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.