OBD Guide
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C1555

Power Steering Motor Relay Welding Failure

C1555 is an OBD-II diagnostic trouble code meaning: Power Steering Motor Relay Welding Failure. Common causes: relay contacts sticking, short circuit in relay control circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Power steering does not work smoothly
  • The steering wheel becomes too light or heavy
  • Humming or strange noises from the power steering
  • EPS malfunction indicator comes on

Causes

  • Relay contacts sticking
  • Short circuit in relay control circuit
  • EPS control unit malfunction
  • Wiring Harness Problems

How to Fix

  1. Check the power steering motor relay
  2. Check relay control circuit for short circuit
  3. Check wiring harness for damage
  4. Replace faulty relay
  5. If necessary, replace the EPS control unit

Related codes

C1550C1556C1560

FAQ

What does the C1555 code mean?

C1555 is an OBD-II diagnostic trouble code that indicates: Power Steering Motor Relay Welding Failure

What causes a C1555 error code?

The most common causes of C1555 include: Relay contacts sticking; Short circuit in relay control circuit; EPS control unit malfunction; Wiring Harness Problems.

How do I fix a C1555 diagnostic trouble code?

To fix C1555: Check the power steering motor relay. Check relay control circuit for short circuit. Check wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1555?

Limited driving only, diagnose soon

How much does it cost to fix C1555?

The estimated repair cost for C1555 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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