OBD Guide
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U352B

High Voltage System Interlock Circuit H Low

U352B is an OBD-II diagnostic trouble code meaning: High Voltage System Interlock Circuit H Low. Common causes: open or short circuit in the interlock circuit, high voltage lockout sensor malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • The car does not go into ready-to-drive mode
  • Reduced power or inability to start
  • High voltage system error message on dashboard

Causes

  • Open or short circuit in the interlock circuit
  • High Voltage Lockout Sensor Malfunction
  • Damage to the high voltage system wiring harness
  • Connector problems or contact corrosion
  • Malfunction of the high-voltage system control module

How to Fix

  1. Check the integrity of the high voltage blocking circuit
  2. Inspect connectors and contacts for damage and corrosion
  3. Check high voltage lockout sensor
  4. Scan the high voltage system control module for errors
  5. Repair only from an authorized dealer

Related codes

U352AU352CU352D

Error U352B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the U352B code mean?

U352B is an OBD-II diagnostic trouble code that indicates: High Voltage System Interlock Circuit H Low

What causes a U352B error code?

The most common causes of U352B include: Open or short circuit in the interlock circuit; High Voltage Lockout Sensor Malfunction; Damage to the high voltage system wiring harness; Connector problems or contact corrosion.

How do I fix a U352B diagnostic trouble code?

To fix U352B: Check the integrity of the high voltage blocking circuit. Inspect connectors and contacts for damage and corrosion. Check high voltage lockout sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U352B?

Do not drive — repair immediately

How much does it cost to fix U352B?

The estimated repair cost for U352B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat