OBD Guide
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C1206

ABS Rear Isolation Valve Circuit Failure

C1206 is an OBD-II diagnostic trouble code meaning: ABS Rear Isolation Valve Circuit Failure. Common causes: open or short circuit in wiring harness, abs isolation valve malfunction. Estimated repair cost: $111–333.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$111–333 (est.)

Symptoms

  • ABS light is on
  • Reduced braking performance on slippery surfaces
  • The ABS system may not work
  • Possible strange noises when braking

Causes

  • Open or short circuit in wiring harness
  • ABS isolation valve malfunction
  • Problems with the ABS module
  • Corroded contacts or poor connection

How to Fix

  1. Check wiring harness for damage
  2. Check valve resistance
  3. Check the power and ground at the valve contacts
  4. If necessary, replace the ABS valve or module
  5. Reset the error and check if it returns

Related codes

C1201C1202C1203C1204

FAQ

What does the C1206 code mean?

C1206 is an OBD-II diagnostic trouble code that indicates: ABS Rear Isolation Valve Circuit Failure

What causes a C1206 error code?

The most common causes of C1206 include: Open or short circuit in wiring harness; ABS isolation valve malfunction; Problems with the ABS module; Corroded contacts or poor connection.

How do I fix a C1206 diagnostic trouble code?

To fix C1206: Check wiring harness for damage. Check valve resistance. Check the power and ground at the valve contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1206?

Limited driving only, diagnose soon

How much does it cost to fix C1206?

The estimated repair cost for C1206 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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