OBD Guide
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U351C

High Voltage System Interlock Circuit D High

U351C is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit D High. Common causes: open circuit in the high-voltage system interlock circuit, damage to the high voltage system wiring harness. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Engine power limitation
  • Inability to start the high voltage system
  • Malfunction warning on the instrument panel
  • Reduced performance of the hybrid system

Causes

  • Open circuit in the high-voltage system interlock circuit
  • Damage to the high voltage system wiring harness
  • Oxidation or poor contact in connectors
  • One of the HVIL components is faulty
  • Damage to the insulation of high-voltage cables

How to Fix

  1. Visual inspection of the high voltage system for damage
  2. Checking the integrity of the interlock circuit
  3. Diagnostics of connectors and contacts in the HVIL system
  4. Replacing Damaged Interlock Circuit Components
  5. Repair only from an authorized dealer

Related codes

U351AU351BU351D

Error U351C by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U351C code mean?

U351C is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit D High

What causes a U351C error code?

The most common causes of U351C include: Open circuit in the high-voltage system interlock circuit; Damage to the high voltage system wiring harness; Oxidation or poor contact in connectors; One of the HVIL components is faulty.

How do I fix a U351C diagnostic trouble code?

To fix U351C: Visual inspection of the high voltage system for damage. Checking the integrity of the interlock circuit. Diagnostics of connectors and contacts in the HVIL system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U351C?

Yes, but get it checked soon

How much does it cost to fix U351C?

The estimated repair cost for U351C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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