Code
C1404
LAND ROVER
C — Chassis
Traction control valve
Views:
UK: 10
EN: 17
RU: 12
AI status
Completed
Completed
100%
Causes
- Faulty traction control (modulator) valve / solenoid
- Open, short or high-resistance wiring between ABS/TC module and valve
- Corroded, loose or contaminated connector at the valve
- Hydraulic contamination or internal valve mechanical seizure
- Defective ABS/TC control module or driver circuitry
- Low brake/accumulator fluid or loss of hydraulic pressure
Symptoms
- Traction Control/ABS warning lamp illuminated
- Loss or reduction of traction control function
- Reduced engine power or limp/limited-slip behavior during traction events
- ABS/traction control intervention may not operate or may be intermittent
- Unusual brake feel, pulsing or poor pedal response in extreme cases
What to check
- Retrieve stored codes and freeze-frame data with a capable scan tool; note any related ABS/TC codes
- Visually inspect valve connector and wiring for corrosion, damage, chafing or moisture
- Check brake fluid level and condition; inspect accumulator and pump operation if applicable
- Perform live-data/actuator tests with diagnostic tool to command the valve and observe responses
- Measure valve coil resistance and compare to OEM specification (consult service manual)
- Backprobe supply and ground to verify ~12 V supply and good ground while cycling/commanding valve
Signal parameters
- Supply voltage to valve: approx. battery voltage (~12 V) when powered
- Solenoid coil resistance: typically low (ohms); compare to vehicle spec — open or short indicates fault
- Control signal: usually PWM/duty-cycle from ABS/TC module; duty varies with requested pressure
- Command vs. feedback: module commanded open/close events should coincide with actuator response on live data
- No/erratic CAN messages to ABS module can coincide with valve faults
Diagnostic algorithm
- Connect a professional scan tool, read and record all ABS/TC codes and freeze-frame data. Note whether C1404 is current or historic.
- Inspect the traction control valve connector and wiring for corrosion, bent pins, damage or water ingress. Repair any obvious issues.
- Check brake fluid level and the condition of the hydraulic unit. Top up if low and inspect for leaks. Replace contaminated fluid if present.
- With key on and engine off, backprobe valve connector to confirm battery supply and ground. Command the valve using a diagnostic tool and observe voltage/response.
- Measure coil resistance at the valve. If resistance is open or shorted outside spec, replace the valve.
- Perform an actuator/solenoid functional test from the diagnostic tool. Listen for valve operation and watch live-data parameters for change.
- Wiggle the wiring harness while monitoring live data to identify intermittent faults. Repair broken wires or corrosion as required.
- If valve and wiring test good, consider ABS/TC module fault. Verify module power/ground/CAN integrity before module replacement. Reflash/update module software if service information recommends.
- Clear codes and perform a controlled road test to verify repair. Re-scan after test to confirm no reoccurrence.
Likely causes
- Stuck or contaminated traction control valve (most common)
- Damaged connector or wiring harness to valve
- Valve coil open/shorted or out-of-spec resistance
- Faulty ABS/traction control module electronics
- Low brake fluid or collapsed accumulator affecting valve operation
Fault status
Status
Traction control valve circuit fault detected. Valve failed to operate or reported out-of-spec; system may disable traction control until fault is resolved.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
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