OBD Guide
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P0B8B

Hybrid/EV Battery Voltage Sense Q Circuit

P0B8B is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Voltage Sense Q Circuit. Common causes: open or short circuit in the q section sensor circuit, battery monitoring module (bms) malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Hybrid system power reduction
  • The vehicle goes into emergency mode
  • Reduced driving range (for electric vehicles)
  • Battery error message on dashboard

Causes

  • Open or short circuit in the Q section sensor circuit
  • Battery Monitoring Module (BMS) malfunction
  • Corrosion or poor contact in the measuring circuit connectors
  • Problems with the high-voltage battery (unbalanced sections)
  • Damage to the wiring harness near the battery

How to Fix

  1. Check the integrity of the wires and connectors of the section Q sensor circuit
  2. Check the resistance and signal of the voltage sensor
  3. Scan the BMS module for additional errors
  4. Check the voltage balance of all battery sections
  5. If necessary, replace the sensor or repair the wiring

Related codes

P0B8AP0B8CP0B89

Error P0B8B by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0B8B code mean?

P0B8B is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Voltage Sense Q Circuit

What causes a P0B8B error code?

The most common causes of P0B8B include: Open or short circuit in the Q section sensor circuit; Battery Monitoring Module (BMS) malfunction; Corrosion or poor contact in the measuring circuit connectors; Problems with the high-voltage battery (unbalanced sections).

How do I fix a P0B8B diagnostic trouble code?

To fix P0B8B: Check the integrity of the wires and connectors of the section Q sensor circuit. Check the resistance and signal of the voltage sensor. Scan the BMS module for additional errors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0B8B?

Limited driving only, diagnose soon

How much does it cost to fix P0B8B?

The estimated repair cost for P0B8B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat