OBD Guide
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U3517

High Voltage System Interlock Circuit C Low

U3517 is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit C Low. Common causes: open circuit in high voltage blocking circuit, short circuit to ground in the interlock circuit. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)

Symptoms

  • Malfunction indicator lamp (MIL) lights up
  • The car may not start or go into limp mode
  • Reduced power or complete loss of traction
  • Possible high voltage system error messages on the display
  • The high voltage battery may not be able to charge

Causes

  • Open circuit in high voltage blocking circuit
  • Short circuit to ground in the interlock circuit
  • Faulty high voltage relay or contactor
  • Problems with the high voltage system wiring harness
  • Malfunction of the high-voltage system control unit

How to Fix

  1. Conduct a visual inspection of high voltage components and wiring
  2. Check the integrity of the interlock circuit using a multimeter
  3. Diagnose the performance of high-voltage relays and contactors
  4. Check connections and connectors in the interlock circuit
  5. If necessary, replace faulty components
  6. Repair only from an authorized dealer

Related codes

U3000U3518U3520

Error U3517 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U3517 code mean?

U3517 is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit C Low

What causes a U3517 error code?

The most common causes of U3517 include: Open circuit in high voltage blocking circuit; Short circuit to ground in the interlock circuit; Faulty high voltage relay or contactor; Problems with the high voltage system wiring harness.

How do I fix a U3517 diagnostic trouble code?

To fix U3517: Conduct a visual inspection of high voltage components and wiring. Check the integrity of the interlock circuit using a multimeter. Diagnose the performance of high-voltage relays and contactors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U3517?

Do not drive — repair immediately

How much does it cost to fix U3517?

The estimated repair cost for U3517 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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