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C1201 — Abs Inlet Valve Coil Lf Circuit Short Ground

Manufacturer-specificChassis

The OBD-II code C1201 indicates a short to ground in the left front inlet valve coil circuit of the anti-lock brake system.

Symptoms

What causes it — most likely first

1. Failed left front inlet valve coil

The coil itself can develop an internal short to ground, causing the circuit to lose proper resistance.

2. Damaged or corroded wiring/connector

Insulation wear, abrasion, or moisture can cause the coil’s wire to short against chassis ground.

3. Loose or improperly seated connector

A poor connection can intermittently create a ground path, triggering the fault.

4. Faulty ABS control module (rare)

A defect inside the module could create a ground fault, but this is uncommon compared to wiring or coil issues.

How it's diagnosed

  1. Visually inspect the left front inlet valve coil wiring harness and connector for damage, corrosion, or loose pins.
  2. Measure coil resistance with a multimeter; compare to manufacturer specifications and check for short to ground.
  3. Perform a continuity test between the coil circuit and chassis ground to locate any short.
  4. If coil and wiring appear intact, test the ABS control module's output circuit for unintended ground paths.
  5. Clear the code and verify that it does not return after a test drive; if it returns, repeat the circuit checks.

Code facts & related codes

SystemChassis
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesC1199 — Abs Inlet Valve Coil Lf Circuit OpenC1200 — Abs Inlet Valve Coil Lf Circuit Short

Frequently asked

Can I fix this by replacing the ABS control module?

Replacing the module is seldom necessary; most cases are resolved by repairing wiring or replacing the inlet valve coil.

Is it safe to drive with code C1201?

The vehicle can usually be driven safely, but the anti‑lock braking function may be disabled, so braking should be done with extra care.

Will clearing the code erase the problem?

No; clearing the code only removes the stored fault until the condition re‑occurs, at which point the light will return.

Do I need to take the car to a dealer?

Not necessarily; a qualified independent technician can perform the same diagnostic steps and repair the circuit.