OBD Guide
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C1257

Power Supply Drive Circuit

C1257 is an OBD-II diagnostic trouble code meaning: Power Supply Drive Circuit. Common causes: open or short circuit in wiring harness, poor contact in circuit connectors. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The passive restraint system is not activated during the test
  • Error persists after reset

Causes

  • Open or short circuit in wiring harness
  • Poor contact in circuit connectors
  • Squib malfunction
  • Problems with the airbag control unit
  • Contact corrosion

How to Fix

  1. Check the wiring harness for opens and shorts
  2. Inspect the circuit connectors for oxidation or damage.
  3. Check the resistance of the squibs
  4. Scan the control unit for additional errors
  5. Replace damaged components if necessary

Related codes

B0001B0010B0020

FAQ

What does the C1257 code mean?

C1257 is an OBD-II diagnostic trouble code that indicates: Power Supply Drive Circuit

What causes a C1257 error code?

The most common causes of C1257 include: Open or short circuit in wiring harness; Poor contact in circuit connectors; Squib malfunction; Problems with the airbag control unit.

How do I fix a C1257 diagnostic trouble code?

To fix C1257: Check the wiring harness for opens and shorts. Inspect the circuit connectors for oxidation or damage.. Check the resistance of the squibs. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1257?

Do not drive — repair immediately

How much does it cost to fix C1257?

The estimated repair cost for C1257 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat