OBD Guide
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C1250

Left Rear ISO Valve Circuit Failure

C1250 is an OBD-II diagnostic trouble code meaning: Left Rear ISO Valve Circuit Failure. Common causes: open or short circuit in wiring harness, iso valve malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • The passive safety system fault indicator is on
  • The passive safety system may not work in an accident.
  • Possible false deployment of airbags

Causes

  • Open or short circuit in wiring harness
  • ISO valve malfunction
  • Poor contact in connectors
  • Problems with the restraint system control unit

How to Fix

  1. Check wiring harness for damage
  2. Check contacts in connectors
  3. Test ISO valve
  4. Replace faulty components
  5. Reset the error and check the system

Related codes

C1251C1252B0100

FAQ

What does the C1250 code mean?

C1250 is an OBD-II diagnostic trouble code that indicates: Left Rear ISO Valve Circuit Failure

What causes a C1250 error code?

The most common causes of C1250 include: Open or short circuit in wiring harness; ISO valve malfunction; Poor contact in connectors; Problems with the restraint system control unit.

How do I fix a C1250 diagnostic trouble code?

To fix C1250: Check wiring harness for damage. Check contacts in connectors. Test ISO valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1250?

Limited driving only, diagnose soon

How much does it cost to fix C1250?

The estimated repair cost for C1250 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat