What Does C1207 Mean?
The ABS module has identified an open circuit in the rear inlet valve solenoid coil. The electrical path through the coil winding is broken, preventing the ABS module from energizing the valve. Without proper inlet valve control, ABS cannot modulate rear brake pressure. The ABS system is disabled and the warning lamp is lit.
Common Causes
35%
Internally broken rear inlet valve solenoid coil winding due to thermal fatigue or manufacturing defect
30%
Broken wire or disconnected splice in the harness for the rear inlet valve circuit
25%
Backed-out, bent, or corroded terminal pin at the modulator connector on the rear inlet valve circuit
10%
ABS module internal open circuit on the rear inlet valve driver output
Diagnostic Steps
1
Disconnect the ABS modulator connector. Measure resistance across the rear inlet valve solenoid coil pins (spec: 3-6 ohms). An OL/infinite reading confirms the coil winding is open.
2
If coil resistance is normal, disconnect the ABS module connector and check wire-to-wire continuity from the module side to the modulator side for each rear inlet valve wire. An open reading identifies the faulty wire.
3
Inspect both connectors carefully. Use a terminal pick to check that each pin is fully seated and locked. Look for signs of overheating (discolored or melted plastic around specific pins).
4
If a harness open is found, repair with a proper butt splice and sealed heat-shrink. If the coil is open, the ABS hydraulic modulator assembly must be replaced.
5
After repair, bleed the ABS system using a scan tool bleed procedure, clear codes, and verify ABS operation on a test drive.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ABS module has identified an open circuit in the rear inlet valve solenoid coil. The electrical path through the coil winding is broken, preventing the ABS module from energizing the valve. Without proper inlet valve control, ABS cannot modulate rear brake pressure. The ABS system is disabled an...
The most common cause of C1207 (ABS Inlet Valve Coil Rear Circuit Open) is: Internally broken rear inlet valve solenoid coil winding due to thermal fatigue or manufacturing defect
Typical repair costs for C1207 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Conventional braking works as designed. ABS is disabled for the entire system. Rear wheel lockup during emergency braking increases stopping distance and may cause the vehicle to become directionally unstable. Repair should be prioritized.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1207 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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