OBD Guide
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P2742

Transmission Fluid Temperature Sensor B Circuit Low

P2742 is an OBD-II diagnostic trouble code meaning: Transmission Fluid Temperature Sensor B Circuit Low. Common causes: transmission fluid temperature sensor b malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine Light Illuminates
  • Reduced transmission efficiency
  • It is possible to switch to emergency mode of operation of the gearbox

Causes

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

How to Fix

  1. Check the continuity of the transmission fluid temperature sensor B
  2. Check sensor connectors and connections
  3. Check sensor resistance according to specifications
  4. Replace transmission fluid temperature sensor B if necessary
  5. Check and, if necessary, replace the transmission control module (TCM)

Related codes

P2740P2741P2743

Error P2742 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P2742 code mean?

P2742 is an OBD-II diagnostic trouble code that indicates: Transmission Fluid Temperature Sensor B Circuit Low

What causes a P2742 error code?

The most common causes of P2742 include: Transmission Fluid Temperature Sensor B Malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Wiring harness damage.

How do I fix a P2742 diagnostic trouble code?

To fix P2742: Check the continuity of the transmission fluid temperature sensor B. Check sensor connectors and connections. Check sensor resistance according to specifications. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P2742?

Yes, but get it checked soon

How much does it cost to fix P2742?

The estimated repair cost for P2742 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat