What Does C1404 Mean?
The ABS/traction control module has detected a general electrical circuit failure in the rear traction control valve solenoid. This valve manages hydraulic brake pressure to the rear axle during traction control events. With this failure, traction control intervention at the rear wheels will be disabled, and the traction control warning light will be on.
Common Causes
35%
Faulty rear traction control solenoid valve (internal electrical failure)
30%
Damaged wiring harness to the rear traction control solenoid
20%
Corroded or loose connector at the ABS hydraulic control unit
15%
ABS module internal solenoid driver failure
Diagnostic Steps
1
Locate the rear traction control solenoid on the ABS hydraulic control unit (HCU). Inspect the connector for corrosion, moisture, bent pins, or physical damage.
2
Measure the rear traction control solenoid coil resistance — typical specification is 3-6 ohms. Values outside this range indicate a failed solenoid.
3
Check wiring continuity from the ABS module connector to the rear solenoid pins. Compare readings with the front solenoid circuits for reference.
4
Measure insulation resistance from each circuit wire to chassis ground — should be greater than 10K ohms to rule out shorts.
5
Use the scan tool to command the rear traction control solenoid on/off. Monitor current draw with a clamp meter — should see 1-2A when energized, 0A when off. No current draw indicates an open circuit or failed driver.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The ABS/traction control module has detected a general electrical circuit failure in the rear traction control valve solenoid. This valve manages hydraulic brake pressure to the rear axle during traction control events. With this failure, traction control intervention at the rear wheels will be disa...
The most common cause of C1404 (Traction Control Valve Rear Circuit Failure) is: Faulty rear traction control solenoid valve (internal electrical failure)
Typical repair costs for C1404 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear-wheel traction control is non-functional. The vehicle may experience excessive rear wheel spin during acceleration on slippery surfaces, which can lead to loss of rear-end stability. Drive conservatively, especially in wet or icy conditions, and repair as soon as possible.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1404 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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