OBD Guide
ENFRDEESPT

P0485

Fan Power/Ground Circuit

P0485 is an OBD-II diagnostic trouble code meaning: Fan Power/Ground Circuit. Common causes: broken fan power cable, poor contact or broken ground wire (ground). Estimated repair cost: $6–56.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine Light Is On
  • The fan doesn't work at all
  • Engine overheating in traffic jams and under high load
  • Air conditioner performance deterioration
  • Coolant temperature is higher than normal

Causes

  • Broken fan power cable
  • Poor contact or broken ground wire (ground)
  • Oxidized ground terminals on the body or engine
  • Faulty fan power relay
  • Blown fan power circuit fuse
  • Oxidation of the fan motor connector
  • Damage to wiring due to temperature or vibration

How to Fix

  1. Check the fan power circuit fuses according to the car diagram
  2. Check the fan relay - replace it with a similar one to check
  3. Measure the supply voltage at the fan connector (should be ~12V when commanded to turn on)
  4. Check the grounding: measure the resistance between the minus of the fan connector and the body (should be <0.5 Ohm)
  5. Inspect the attachment points of the mass wires - clean them from rust and oxidation
  6. Check the fan motor by applying power directly from the battery
  7. Repair damaged wiring or replace connector
  8. Reset codes after repair

Related codes

P0480P0481P0482P0483P0484P0217

Error P0485 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0485 code mean?

P0485 is an OBD-II diagnostic trouble code that indicates: Fan Power/Ground Circuit

What causes a P0485 error code?

The most common causes of P0485 include: Broken fan power cable; Poor contact or broken ground wire (ground); Oxidized ground terminals on the body or engine; Faulty fan power relay.

How do I fix a P0485 diagnostic trouble code?

To fix P0485: Check the fan power circuit fuses according to the car diagram. Check the fan relay - replace it with a similar one to check. Measure the supply voltage at the fan connector (should be ~12V when commanded to turn on). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0485?

Do not drive — repair immediately

How much does it cost to fix P0485?

The estimated repair cost for P0485 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat