OBD Guide
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P06B4

Sensor Power Supply B Circuit Low

P06B4 is an OBD-II diagnostic trouble code meaning: Sensor Power Supply B Circuit Low. Common causes: short to ground in the circuit of one of the sensors of group b, faulty sensor with internal breakdown to ground. Estimated repair cost: $6–56.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine Light Is On
  • Group B sensor readings are too low
  • Unstable engine operation
  • Many associated sensor errors simultaneously
  • Possible engine transition to emergency mode

Causes

  • Short to ground in the circuit of one of the sensors of group B
  • Faulty sensor with internal breakdown to ground
  • Damage to group B wiring harness (chaining to body)
  • Moisture getting into connectors causing leakage
  • High contact resistance in the ECU power connector

How to Fix

  1. Read error codes, identify group B sensors according to the diagram
  2. Measure the voltage on the Group B power line (expected to be below normal)
  3. Disconnect sensors one at a time until normal voltage is restored
  4. Check the resistance of the identified sensor between power and ground
  5. Replace the faulty sensor or repair the short in the wiring
  6. Reset codes and ensure normal voltage level after repair

Related codes

P06B3P06B5P06B1P0651P0652

Error P06B4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P06B4 code mean?

P06B4 is an OBD-II diagnostic trouble code that indicates: Sensor Power Supply B Circuit Low

What causes a P06B4 error code?

The most common causes of P06B4 include: Short to ground in the circuit of one of the sensors of group B; Faulty sensor with internal breakdown to ground; Damage to group B wiring harness (chaining to body); Moisture getting into connectors causing leakage.

How do I fix a P06B4 diagnostic trouble code?

To fix P06B4: Read error codes, identify group B sensors according to the diagram. Measure the voltage on the Group B power line (expected to be below normal). Disconnect sensors one at a time until normal voltage is restored. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P06B4?

Do not drive — repair immediately

How much does it cost to fix P06B4?

The estimated repair cost for P06B4 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat