OBD Guide
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P1673

Cooling Fan Relay Circuit Malfunction

P1673 is an OBD-II diagnostic trouble code meaning: Cooling Fan Relay Circuit Malfunction. Common causes: faulty fan relay, open or short circuit in the circuit. Estimated repair cost: $6–33.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Engine overheating
  • Cooling fan does not turn on
  • The fan runs constantly
  • Check Engine light comes on
  • Reduced engine power

Causes

  • Faulty fan relay
  • Open or short circuit in the circuit
  • Damaged wiring harness
  • Faulty engine control unit
  • Fan circuit fuse problems

How to Fix

  1. Check and replace fan fuse
  2. Check the fan relay and replace if necessary
  3. Inspect the wiring harness for damage
  4. Check the operation of the fan by forcing it on
  5. Scan the control unit for additional errors

Related codes

P0480P0481P0691

Error P1673 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturn

FAQ

What does the P1673 code mean?

P1673 is an OBD-II diagnostic trouble code that indicates: Cooling Fan Relay Circuit Malfunction

What causes a P1673 error code?

The most common causes of P1673 include: Faulty fan relay; Open or short circuit in the circuit; Damaged wiring harness; Faulty engine control unit.

How do I fix a P1673 diagnostic trouble code?

To fix P1673: Check and replace fan fuse. Check the fan relay and replace if necessary. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1673?

Limited driving only, diagnose soon

How much does it cost to fix P1673?

The estimated repair cost for P1673 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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