What Does C1407 Mean?
The ABS module has detected a short-to-battery (B+) condition in the rear traction control valve solenoid circuit. Positive voltage is being fed into the solenoid control circuit from an external source, preventing proper module control of the valve. Traction control is disabled and the warning light is illuminated.
Common Causes
40%
Wiring harness damage allowing contact between the solenoid circuit and a power supply wire
25%
Previous improper wiring repair or aftermarket installation cross-feeding voltage
20%
Connector pin spread or damage causing cross-contact with power pins
15%
ABS module internal failure with voltage backfeed on solenoid output
Diagnostic Steps
1
Disconnect the ABS HCU connector and check for voltage on the rear traction control solenoid circuit pins using a voltmeter referenced to chassis ground — should be 0V. Any voltage present indicates an external power source backfeed.
2
If voltage is found, disconnect the solenoid at the valve end and re-check to isolate whether the backfeed is in the harness or at the solenoid.
3
Trace the harness and inspect for insulation damage where solenoid wires run alongside or through the same loom as power supply circuits (pump motor, relay feeds, etc.).
4
Examine the multi-pin ABS connector body for damaged pin guides or contamination that could cause pin-to-pin contact with adjacent power circuits.
5
If no harness fault is found, test the ABS module by monitoring solenoid driver output voltage while commanding activation — a module that outputs constant B+ regardless of command state is internally failed.
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The ABS module has detected a short-to-battery (B+) condition in the rear traction control valve solenoid circuit. Positive voltage is being fed into the solenoid control circuit from an external source, preventing proper module control of the valve. Traction control is disabled and the warning ligh...
The most common cause of C1407 (Traction Control Valve Rear Circuit Short To Battery) is: Wiring harness damage allowing contact between the solenoid circuit and a power supply wire
Typical repair costs for C1407 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear traction control is disabled. The short-to-battery condition could potentially keep the rear solenoid energized, causing rear brake drag and uneven braking behavior. Monitor for unusual pulling or rear brake heat. Have the system repaired promptly for full safety system restoration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1407 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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