OBD Guide
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P01B4

Alternative Fuel Rail Temperature Sensor Circuit

P01B4 is an OBD-II diagnostic trouble code meaning: Alternative Fuel Rail Temperature Sensor Circuit. Common causes: open or short circuit in the sensor wiring harness, fuel rail temperature sensor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Deterioration of vehicle dynamics
  • Unstable engine operation
  • Increased fuel consumption
  • Difficulty starting the engine
  • Check Engine Light Illuminates

Causes

  • Open or short circuit in the sensor wiring harness
  • Fuel rail temperature sensor malfunction
  • Poor contact in sensor or ECU connectors
  • Problems with power or grounding of the circuit
  • Engine ECU malfunction

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Check the sensor and ECU connectors for corrosion or damage.
  3. Measure the sensor resistance and compare with the nominal values
  4. Check the power supply and grounding of the sensor circuit
  5. If necessary, replace the fuel rail temperature sensor
  6. Clear the error memory and test run the engine

Related codes

P01B1P01B2P01B3P01B5

Error P01B4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P01B4 code mean?

P01B4 is an OBD-II diagnostic trouble code that indicates: Alternative Fuel Rail Temperature Sensor Circuit

What causes a P01B4 error code?

The most common causes of P01B4 include: Open or short circuit in the sensor wiring harness; Fuel rail temperature sensor malfunction; Poor contact in sensor or ECU connectors; Problems with power or grounding of the circuit.

How do I fix a P01B4 diagnostic trouble code?

To fix P01B4: Check the integrity of the sensor wiring harness. Check the sensor and ECU connectors for corrosion or damage.. Measure the sensor resistance and compare with the nominal values. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P01B4?

Limited driving only, diagnose soon

How much does it cost to fix P01B4?

The estimated repair cost for P01B4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat