OBD Guide
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P2C85

Hybrid/EV Battery Voltage External Isolation Fault

P2C85 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Voltage External Isolation Fault. Common causes: damage to the insulation of high-voltage cables, corrosion of high voltage connectors. Estimated repair cost: $167–889.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–889 (est.)

Symptoms

  • Check Engine light comes on
  • High voltage system fault warning appears
  • Reduced power or hybrid system failure
  • The car may go into emergency mode
  • Possible problems with battery charging

Causes

  • Damage to the insulation of high-voltage cables
  • Corrosion of high voltage connectors
  • Moisture ingress into high voltage components
  • High voltage battery fault
  • Problems with insulation sensors

How to Fix

  1. Visual inspection of high voltage cables and connectors
  2. Checking the insulation condition of high voltage components
  3. High voltage battery diagnostics
  4. Checking insulation sensors
  5. Repair or replace damaged components
  6. Repair only from an authorized dealer

Related codes

P0AA6P1A00P2C84

Error P2C85 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P2C85 code mean?

P2C85 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Voltage External Isolation Fault

What causes a P2C85 error code?

The most common causes of P2C85 include: Damage to the insulation of high-voltage cables; Corrosion of high voltage connectors; Moisture ingress into high voltage components; High voltage battery fault.

How do I fix a P2C85 diagnostic trouble code?

To fix P2C85: Visual inspection of high voltage cables and connectors. Checking the insulation condition of high voltage components. High voltage battery diagnostics. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P2C85?

Do not drive — repair immediately

How much does it cost to fix P2C85?

The estimated repair cost for P2C85 is $167–889. Actual cost depends on your vehicle, location, and labor rates.

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