Code
C001D
FIAT
C — Chassis
Right rear discharge valve
Views:
UK: 5
EN: 7
RU: 5
AI status
Completed
Completed
100%
Causes
- Open or short in right rear discharge valve wiring or connector
- Corroded or poor electrical connection at solenoid or ABS module
- Failed right rear discharge valve solenoid (stuck open/closed or coil failure)
- Internal hydraulic fault or valve contamination/clogging
- Faulty ABS/ESP control module or driver transistor
- Intermittent wiring damage (chafing, water ingress)
Symptoms
- ABS/ESP warning lamp illuminated
- Reduced or altered braking or ABS function under hard braking
- Brake pedal pulsation or longer pedal travel in ABS events
- Traction/ESP interventions may be limited for the affected wheel
- Stored freeze-frame data showing event during braking
What to check
- Scan tool: read DTCs, freeze frame and related ABS codes
- Attempt active test / command valve ON/OFF with a capable scan tool
- Visual inspection of right rear valve connector and harness for damage, corrosion or fluid entry
- Check for fluid leaks at ABS valve body and brake lines to right rear
- Measure supply voltage and ground at the valve connector with connector connected
- Measure coil resistance at the valve (with harness disconnected)
Signal parameters
- Typical activation: switched 12 V supply or PWM from ABS module (varies by model)
- Solenoid coil resistance: commonly 5–50 ohms depending on design (refer to vehicle spec)
- Expected open-circuit: >100 kohm (if open) ; short to ground typically
- Command signal during active test: duty cycle or ON/OFF as shown by scan tool
Diagnostic algorithm
- Connect a diagnostic scan tool and record all ABS/ESP codes and freeze-frame data.
- Clear the code, perform a road test or ABS exercise to attempt to re-create and confirm condition.
- Visually inspect valve connector and wiring for corrosion, broken wires, melted insulation or fluid intrusion.
- With ignition off, disconnect the valve connector. Check for continuity of wiring to the ABS module pins and for unintended shorts to ground or battery using a multimeter.
- Measure valve coil resistance at the connector (manufacturer spec preferred). If open or shorted, suspect valve failure.
- With connector attached and ignition ON (or during an active test), measure supply voltage and ground while commanding the valve. Confirm the module supplies appropriate voltage or PWM.
- If wiring and voltage are good but valve does not respond, consider bench-testing or swapping with an identical valve (if available) to verify valve function.
- Inspect brake hydraulic passages and valve body for contamination or leakage; replace or service valve assembly if internally blocked or leaking.
- If wiring and valve are OK, test ABS control module outputs and grounds; repair or replace module if driver circuit is faulty.
- After repairs, clear codes and perform ABS functional test and road test to confirm fault is resolved.
Likely causes
- Damaged connector pins at valve harness or ABS module
- Solenoid coil resistance out of specification (open or shorted)
- Water or brake fluid contamination in valve assembly
- ABS valve body internal wear or blockage
- Ground or power supply fault to the valve circuit
Fault status
Status
ABS control module reports fault with right rear discharge valve circuit — electrical fault (open/short/intermittent) or hydraulic/valve malfunction detected.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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