OBD Guide
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P1641

Cooling Fan Relay 1 Control Circuit

P1641 is an OBD-II diagnostic trouble code meaning: Cooling Fan Relay 1 Control Circuit. Common causes: faulty fan relay, open or short circuit in control circuit. Estimated repair cost: $6–33.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
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 when overheated

Causes

  • Faulty fan relay
  • Open or short circuit in control circuit
  • Damaged wiring harness
  • Oxidized or damaged connector pins
  • Engine control unit malfunction

How to Fix

  1. Check the condition of the fan relay and replace if necessary
  2. Check the integrity of the wiring and connectors in the control circuit
  3. Check fuses associated with the cooling system
  4. Scan the system for other errors
  5. Check the operation of the engine control unit

Related codes

P1640P1642P1643

Error P1641 by Vehicle Brand

BuickCadillacChevroletFordGMGMCJaguarLincolnMercuryOldsmobileSaturnVolkswagen

FAQ

What does the P1641 code mean?

P1641 is an OBD-II diagnostic trouble code that indicates: Cooling Fan Relay 1 Control Circuit

What causes a P1641 error code?

The most common causes of P1641 include: Faulty fan relay; Open or short circuit in control circuit; Damaged wiring harness; Oxidized or damaged connector pins.

How do I fix a P1641 diagnostic trouble code?

To fix P1641: Check the condition of the fan relay and replace if necessary. Check the integrity of the wiring and connectors in the control circuit. Check fuses associated with the cooling system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1641?

Do not drive — repair immediately

How much does it cost to fix P1641?

The estimated repair cost for P1641 is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat