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Home / DTC / C0004 — TCS Control Channel B Valve 2

C0004 — TCS Control Channel B Valve 2

Detailed page for trouble code C0004.

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Code

C0004

Generic C — Chassis

TCS Control Channel B Valve 2

Brand: Generic
Type: C — Chassis
Views: UK: 25 EN: 59 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Connect a manufacturer-capable scan tool and confirm fault C0004; record freeze-frame and related codes
  2. Perform visual inspection of valve connector and wiring for damage, corrosion, or pin push-out; repair as needed
  3. Check ABS/TCS module power and ground circuits: verify fuse(s), relay operation, and proper ground continuity
  4. With ignition OFF, disconnect valve harness and measure coil resistance across the valve pins; compare to specification — replace valve if open or shorted
  5. With ignition ON, measure supply voltage at the harness connector; if no battery voltage, trace and repair power feed/fuse/relay
  6. 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
  7. If driver signal is present but valve does not operate, replace the valve or repair the hydraulic modulator as required
  8. If valve and wiring test OK but fault persists, perform module self-test and inspect module grounds; consider module replacement or specialist repair
  9. 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

Similar codes

C0001 C0002 C0003 C0005 C0006
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Code

C0004

HYUNDAI C — Chassis

TCS Control Channel “B” Valve 2 (Subfault)

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 14 EN: 25 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Connect a manufacturer-capable scan tool and confirm fault C0004; record freeze-frame and related codes
  2. Perform visual inspection of valve connector and wiring for damage, corrosion, or pin push-out; repair as needed
  3. Check ABS/TCS module power and ground circuits: verify fuse(s), relay operation, and proper ground continuity
  4. With ignition OFF, disconnect valve harness and measure coil resistance across the valve pins; compare to specification — replace valve if open or shorted
  5. With ignition ON, measure supply voltage at the harness connector; if no battery voltage, trace and repair power feed/fuse/relay
  6. 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
  7. If driver signal is present but valve does not operate, replace the valve or repair the hydraulic modulator as required
  8. If valve and wiring test OK but fault persists, perform module self-test and inspect module grounds; consider module replacement or specialist repair
  9. 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

Similar codes

C0001 C0002 C0003 C0005 C0006
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Code

C0004

LAND ROVER C — Chassis

Traction control key control - channel B, valve 2

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 6 EN: 15 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. Connect a manufacturer-capable scan tool and confirm fault C0004; record freeze-frame and related codes
  2. Perform visual inspection of valve connector and wiring for damage, corrosion, or pin push-out; repair as needed
  3. Check ABS/TCS module power and ground circuits: verify fuse(s), relay operation, and proper ground continuity
  4. With ignition OFF, disconnect valve harness and measure coil resistance across the valve pins; compare to specification — replace valve if open or shorted
  5. With ignition ON, measure supply voltage at the harness connector; if no battery voltage, trace and repair power feed/fuse/relay
  6. 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
  7. If driver signal is present but valve does not operate, replace the valve or repair the hydraulic modulator as required
  8. If valve and wiring test OK but fault persists, perform module self-test and inspect module grounds; consider module replacement or specialist repair
  9. 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

Similar codes

C0001 C0002 C0003 C0005 C0006
Workshop Manuals

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Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
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  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
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  • - Adjustment
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Short description

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199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

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Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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