OBD Guide
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P01B8

Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic

P01B8 is an OBD-II diagnostic trouble code meaning: Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic. Common causes: open or short circuit in wiring harness, poor contact in the sensor connector. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Unstable engine operation
  • Power reduction
  • Increased fuel consumption
  • Check Engine Light Illuminates

Causes

  • Open or short circuit in wiring harness
  • Poor contact in the sensor connector
  • Fuel rail temperature sensor malfunction
  • Problems with the engine control unit (ECU)
  • Contact corrosion

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Inspect connectors and contacts for damage or corrosion
  3. Check the resistance and signal of the temperature sensor
  4. If necessary, replace the sensor or repair the wiring harness
  5. Reset the error code and check if it returns

Related codes

P01B7P01B9P0180P0181

Error P01B8 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P01B8 code mean?

P01B8 is an OBD-II diagnostic trouble code that indicates: Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic

What causes a P01B8 error code?

The most common causes of P01B8 include: Open or short circuit in wiring harness; Poor contact in the sensor connector; Fuel rail temperature sensor malfunction; Problems with the engine control unit (ECU).

How do I fix a P01B8 diagnostic trouble code?

To fix P01B8: Check the integrity of the sensor wiring harness. Inspect connectors and contacts for damage or corrosion. Check the resistance and signal of the temperature sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P01B8?

Limited driving only, diagnose soon

How much does it cost to fix P01B8?

The estimated repair cost for P01B8 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat