OBD Guide
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P038F

Ignition J Control Signal Circuit High

P038F is an OBD-II diagnostic trouble code meaning: Ignition J Control Signal Circuit High. Common causes: short circuit of the control circuit of the coil j at +12v, internal short circuit in ignition coil j. Estimated repair cost: $33–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–278 (est.)

Symptoms

  • Misfire in cylinders controlled by coil J
  • Unstable engine operation
  • Possible overheating of coil J
  • Check Engine Light Is On
  • Loss of engine power

Causes

  • Short circuit of the control circuit of the coil J at +12V
  • Internal short circuit in ignition coil J
  • Damage to control circuit wire insulation
  • ECU control transistor malfunction
  • Moisture getting into the coil connector

How to Fix

  1. Read codes, freeze frame data
  2. Disconnect the J coil connector, check if the voltage on the control wire disappears
  3. Check the control wire for short circuit to +12V (resistance between the control contact and the power supply plus)
  4. Inspect the wiring for pinching or touching hot surfaces (insulation melting)
  5. Check the resistance of the primary winding of coil J
  6. Replace the coil and/or eliminate the short circuit in the wiring

Related codes

P036BP031CP031FP0358P0360

Error P038F by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P038F code mean?

P038F is an OBD-II diagnostic trouble code that indicates: Ignition J Control Signal Circuit High

What causes a P038F error code?

The most common causes of P038F include: Short circuit of the control circuit of the coil J at +12V; Internal short circuit in ignition coil J; Damage to control circuit wire insulation; ECU control transistor malfunction.

How do I fix a P038F diagnostic trouble code?

To fix P038F: Read codes, freeze frame data. Disconnect the J coil connector, check if the voltage on the control wire disappears. Check the control wire for short circuit to +12V (resistance between the control contact and the power supply plus). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P038F?

Do not drive — repair immediately

How much does it cost to fix P038F?

The estimated repair cost for P038F is $33–278. Actual cost depends on your vehicle, location, and labor rates.

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