What it means
C0080 indicates an electrical fault in the left rear ABS solenoid number 1 circuit. The ABS control module sets it when the solenoid circuit does not respond as expected electrically.
At a glance
- Usually lights the ABS or stability-control warning light
How it works
The ABS hydraulic control unit contains solenoid valves that regulate pressure at individual wheels; solenoid number 1 serves the left-rear circuit. C0080 sets when the ABS module detects an electrical response from that left-rear solenoid circuit that does not match its expected condition.
Common causes
Most likely first.
- Open or shorted wiring
- Corroded or loose hydraulic unit connector
- Failed solenoid coil
- ABS control module fault
Symptoms
- ABS warning light
- ABS may be disabled
How to diagnose it
- Read the C0080 subtype and freeze-frame data, and check for other ABS codes that may point to a shared power or connector problem.
- Inspect the hydraulic control unit connector and left-rear solenoid wiring for corrosion, loose pins, chafing, or damage.
- Check the ABS fuses, power feeds, and grounds associated with the hydraulic unit.
- With the system safely powered down as directed by vehicle service information, test the left-rear solenoid number 1 circuit for opens or shorts.
- Measure the solenoid coil and verify module-side circuit operation against the manufacturer's specification before condemning the ABS module.
Common fixes
- Clean and secure the hydraulic control unit connector if corrosion or looseness is confirmed.
- Repair an open, short, or damaged wire in the left-rear solenoid number 1 circuit.
- Replace the left-rear solenoid coil or hydraulic unit if testing confirms the coil has failed.
- Replace or reprogram the ABS control module only after the solenoid and wiring tests rule out other causes.
Can I keep driving?
Base braking may remain, but ABS may be unavailable and wheels can lock during hard braking. Drive cautiously, leave extra stopping distance, and avoid slippery conditions until repaired.
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.