OBD Guide
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C1554

Power Source Relay Circuit Malfunction

C1554 is an OBD-II diagnostic trouble code meaning: Power Source Relay Circuit Malfunction. Common causes: faulty power relay, broken or damaged wiring. Estimated repair cost: $56–167.

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

Symptoms

  • Problems starting the engine
  • Unstable operation of electrical equipment
  • Stalling engine
  • Power Loss

Causes

  • Faulty power relay
  • Broken or damaged wiring
  • Bad contacts in the circuit
  • Short circuit
  • Faulty control unit

How to Fix

  1. Check the condition of the power relay
  2. Inspect the wiring for damage
  3. Check the integrity of the contacts
  4. Test relay operation
  5. If necessary, replace the relay or wiring

Related codes

P0560P0562P0563

FAQ

What does the C1554 code mean?

C1554 is an OBD-II diagnostic trouble code that indicates: Power Source Relay Circuit Malfunction

What causes a C1554 error code?

The most common causes of C1554 include: Faulty power relay; Broken or damaged wiring; Bad contacts in the circuit; Short circuit.

How do I fix a C1554 diagnostic trouble code?

To fix C1554: Check the condition of the power relay. Inspect the wiring for damage. Check the integrity of the contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1554?

Do not drive — repair immediately

How much does it cost to fix C1554?

The estimated repair cost for C1554 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat