OBD Guide
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C1200

ABS Inlet Valve Coil LF Circuit Short To Battery

C1200 is an OBD-II diagnostic trouble code meaning: ABS Inlet Valve Coil LF Circuit Short To Battery. Common causes: short circuit of the intake valve coil inside the abs hydraulic unit, damage to the electrical wiring to the abs valve body connector. Estimated repair cost: $11–667.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$11–667 (est.)

Symptoms

  • The ABS indicator on the dashboard is on
  • ABS is disabled, wheels may lock during heavy braking
  • Code C1200 when connecting a diagnostic scanner
  • It is possible to disable ESP/ESC and other systems
  • The pulsating sensation in the brake pedal may disappear (ABS does not activate)

Causes

  • Short circuit of the intake valve coil inside the ABS hydraulic unit
  • Damage to the electrical wiring to the ABS valve body connector
  • Oxidation or short circuit in the ABS unit connector
  • Overheating and breakdown of solenoid winding insulation
  • Malfunction of the ABS control unit (rare)

How to Fix

  1. Read error codes with a diagnostic scanner with ABS functions
  2. Check the ABS hydraulic unit connector for contamination, oxidation and damage to the contacts.
  3. Measure the intake valve coil resistance (usually 3-7 ohms) between the corresponding connector pins
  4. Check the wiring from the ABS control unit to the valve body for a short circuit
  5. If the valve body malfunctions, replace it (new or refurbished)
  6. After replacement, bleed the brake system and reset error codes

Related codes

C1166C12B6C1356C1192C1252

FAQ

What does the C1200 code mean?

C1200 is an OBD-II diagnostic trouble code that indicates: ABS Inlet Valve Coil LF Circuit Short To Battery

What causes a C1200 error code?

The most common causes of C1200 include: Short circuit of the intake valve coil inside the ABS hydraulic unit; Damage to the electrical wiring to the ABS valve body connector; Oxidation or short circuit in the ABS unit connector; Overheating and breakdown of solenoid winding insulation.

How do I fix a C1200 diagnostic trouble code?

To fix C1200: Read error codes with a diagnostic scanner with ABS functions. Check the ABS hydraulic unit connector for contamination, oxidation and damage to the contacts.. Measure the intake valve coil resistance (usually 3-7 ohms) between the corresponding connector pins. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1200?

Yes, but get it checked soon

How much does it cost to fix C1200?

The estimated repair cost for C1200 is $11–667. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat