OBD Guide

P0494

Fan 1 Underspeed

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–167 (est.)

Symptoms

  • Engine overheating
  • Increased coolant temperature
  • Unstable fan operation
  • Check Engine light comes on

Causes

  • Faulty cooling fan
  • Damaged wiring harness or connectors
  • Faulty fan relay
  • Fan control module problems
  • Low coolant level

How to Fix

  1. Check coolant level
  2. Check fan wiring harness and connectors
  3. Check fan relays and fuses
  4. Check the fan speed using a diagnostic scanner
  5. Replace the fan if necessary

Related codes

Error P0494 by Vehicle Brand