What Does C1199 Mean?
The ABS module has detected an open circuit condition in the left front (LF) inlet valve solenoid coil. This means the electrical path through the solenoid winding is broken, so the ABS module cannot energize the valve to hold or reduce brake pressure on the LF wheel during an ABS event. The ABS warning lamp will be on and the system disabled.
Common Causes
35%
Broken or internally open LF inlet valve solenoid coil winding inside the ABS hydraulic modulator
30%
Open circuit in the wiring harness between ABS module and modulator due to a broken wire or pulled connector
25%
Backed-out or corroded terminal pin at the modulator connector creating an open circuit
10%
ABS control module internal open in the valve driver output circuit
Diagnostic Steps
1
Disconnect the ABS hydraulic modulator connector. Using a DVOM, measure the resistance across the LF inlet valve solenoid coil pins. Specification is typically 3-6 ohms; an OL (open line) reading confirms a broken coil.
2
If coil resistance is within spec, check for continuity from the ABS module connector pins to the corresponding modulator connector pins. Repair any open wires.
3
Inspect the modulator connector body and pins for signs of water damage, green/white corrosion, or physical damage. Check that each terminal is fully seated and has proper spring tension.
4
If the solenoid coil reads open, the ABS hydraulic modulator assembly must be replaced. Bench bleed the new unit per manufacturer procedure before installation.
5
After repair, clear all ABS codes and perform an ABS functional test drive. Monitor for code recurrence and verify ABS activation on a low-traction surface.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ABS module has detected an open circuit condition in the left front (LF) inlet valve solenoid coil. This means the electrical path through the solenoid winding is broken, so the ABS module cannot energize the valve to hold or reduce brake pressure on the LF wheel during an ABS event. The ABS war...
The most common cause of C1199 (ABS Inlet Valve Coil LF Circuit Open) is: Broken or internally open LF inlet valve solenoid coil winding inside the ABS hydraulic modulator
Typical repair costs for C1199 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Conventional braking remains fully operational. ABS is disabled, so the left front wheel may lock during emergency braking. This is especially hazardous on wet, icy, or gravel surfaces where ABS prevents skidding. Schedule repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1199 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control
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