OBD Guide
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P0C77

Hybrid/EV Battery System Precharge Time Too Short

P0C77 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery System Precharge Time Too Short. Common causes: pre-charge relay malfunction, problems with the precharge resistor. Estimated repair cost: $56–278.

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

Symptoms

  • The check engine or hybrid system light comes on
  • Reduced performance of the hybrid system
  • The car may go into emergency mode
  • Possible problems with charging the high-voltage battery
  • Clicking or unusual noises from the high voltage compartment

Causes

  • Pre-charge relay malfunction
  • Problems with the precharge resistor
  • Short circuit in high voltage circuit
  • Malfunction of the hybrid system control unit
  • Damage to the high voltage system wiring harness

How to Fix

  1. Check the precharge relay for faults
  2. Check the resistance and integrity of the precharge resistor
  3. Diagnose high-voltage circuits for short circuits
  4. Check the condition of the high voltage system wiring harness
  5. Scan the hybrid system control module for additional errors
  6. Repair only from an authorized dealer

Related codes

P0C78P0C79P0A80

Error P0C77 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0C77 code mean?

P0C77 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery System Precharge Time Too Short

What causes a P0C77 error code?

The most common causes of P0C77 include: Pre-charge relay malfunction; Problems with the precharge resistor; Short circuit in high voltage circuit; Malfunction of the hybrid system control unit.

How do I fix a P0C77 diagnostic trouble code?

To fix P0C77: Check the precharge relay for faults. Check the resistance and integrity of the precharge resistor. Diagnose high-voltage circuits for short circuits. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0C77?

Do not drive — repair immediately

How much does it cost to fix P0C77?

The estimated repair cost for P0C77 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat