Code
C0004
Generic
C — Chassis
TCS Control Channel B Valve 2
Views:
UK: 31
EN: 71
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or shorted valve coil (solenoid)
- Intermittent or corroded connector or wiring harness damage
- Poor ground or supply voltage to ABS/TCS module
- Contaminated or mechanically stuck hydraulic valve
- Faulty ABS/TCS control module (driver output)
- Blown fuse or faulty relay supplying the ABS/TCS module
Symptoms
- TCS/ABS warning lamp(s) illuminated
- Reduced or disabled traction control functionality
- Brake modulation or pulsation during traction events
- Possible erratic ABS/TCS behavior or unintended braking
- Stored fault code C0004 (or related ABS/TCS codes)
What to check
- Read freeze frame and live data with a scan tool; confirm C0004 and any related codes
- Visually inspect wiring harness and connector at the valve and ABS/TCS modulator for corrosion, damage, or looseness
- Check fuses and relays for the ABS/TCS/ECU power supply
- Verify grounds for ABS/TCS module are clean and tight
- Command the valve using a suitable scan tool (if supported) and observe valve response and live data
- Measure supply voltage at the valve connector with ignition ON and while commanded
Signal parameters
- Supply voltage at valve connector: battery voltage (approx. 11–14 V with ignition ON)
- Coil resistance (typical solenoid): ~5–50 ohms (consult vehicle spec)
- Driver output when commanded: PWM signal; duty cycle varies with action (0–100%)
- No-load control voltage: 0 V when off, switched/PWM when active
- Expected change in current when commanded (increases when valve energized)
Diagnostic algorithm
- Connect a manufacturer-capable scan tool and confirm fault C0004; record freeze-frame and related codes
- Perform visual inspection of valve connector and wiring for damage, corrosion, or pin push-out; repair as needed
- Check ABS/TCS module power and ground circuits: verify fuse(s), relay operation, and proper ground continuity
- With ignition OFF, disconnect valve harness and measure coil resistance across the valve pins; compare to specification — replace valve if open or shorted
- With ignition ON, measure supply voltage at the harness connector; if no battery voltage, trace and repair power feed/fuse/relay
- Backprobe the control pin while commanding the valve with a scan tool; verify the ECU is driving the correct PWM/voltage signal — if no driver signal, suspect module or wiring
- If driver signal is present but valve does not operate, replace the valve or repair the hydraulic modulator as required
- If valve and wiring test OK but fault persists, perform module self-test and inspect module grounds; consider module replacement or specialist repair
- Clear codes and perform a road/test cycle to verify repair; re-scan for reappearance of code
Likely causes
- Damaged wiring or connector at the valve
- Valve coil open or low coil resistance (electrical fault)
- Contamination or mechanical seizure of the valve
- Faulty module driver output
- Blown fuse or poor ground
Fault status
Status
TCS Control Channel B Valve 2 — electrical or functional fault detected (open/short/no response/PWM driver anomaly).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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