OBD Guide
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P2740

Transmission Fluid Temperature Sensor B Circuit

P2740 is an OBD-II diagnostic trouble code meaning: Transmission Fluid Temperature Sensor B Circuit. Common causes: open or short circuit in the sensor circuit, transmission fluid temperature sensor b malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine Light Is On
  • The gearbox goes into emergency mode
  • Unstable gear shifting
  • Reduced transmission efficiency
  • Incorrect transmission fluid temperature readings

Causes

  • Open or short circuit in the sensor circuit
  • Transmission Fluid Temperature Sensor B Malfunction
  • Poor contact in the sensor connector
  • Wiring harness damage
  • Transmission control module (TCM) malfunction

How to Fix

  1. Check the integrity of the sensor circuit
  2. Check sensor resistance and voltage
  3. Inspect connectors and wiring harness for damage
  4. Replace the transmission fluid temperature sensor if necessary
  5. Check and, if necessary, replace the transmission control unit

Related codes

P2730P2750P2760

Error P2740 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P2740 code mean?

P2740 is an OBD-II diagnostic trouble code that indicates: Transmission Fluid Temperature Sensor B Circuit

What causes a P2740 error code?

The most common causes of P2740 include: Open or short circuit in the sensor circuit; Transmission Fluid Temperature Sensor B Malfunction; Poor contact in the sensor connector; Wiring harness damage.

How do I fix a P2740 diagnostic trouble code?

To fix P2740: Check the integrity of the sensor circuit. Check sensor resistance and voltage. Inspect connectors and wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P2740?

Limited driving only, diagnose soon

How much does it cost to fix P2740?

The estimated repair cost for P2740 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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