Powertrain, generic (extended)

P274F Transmission Fluid Temperature Sensor C Over Temperature Condition

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P274F means sensor C reports a plausible value that is nevertheless above the overheat limit set in the calibration. It is a condition report rather than a circuit defect, and no manufacturer documents its threshold or the location of sensor C publicly. For the main sensor the equivalent is P0218, which Saab's Aisin gearbox stores at over 170 °C held longer than 10 s. Depending on where C measures – for example at a clutch pack or in a cooler line – the trigger may be a heavily loaded clutch or a restricted oil flow rather than overall sump heat. Expect protective measures such as torque limits or a changed shift pattern; let the unit cool, then check fluid level, condition and the cooling circuit.

Likely causes

High load or heavy clutch slip
Restricted oil flow or clogged cooler
Low or worn-out fluid
Sensor C reading too hot within range

Symptoms

  • Overheating warning
  • Limited torque or altered shifting

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

trans fluid temp sensor ctransmission fluidcooler

Related codes

P274AP274BP274CP0218P273F

References: law.cornell.edu, saabwisonline.com.