Powertrain, generic (extended)

P2741 Transmission Fluid Temperature Sensor B Circuit Range/Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modePossible

P2741 flags a sensor B signal that is electrically intact but physically impossible or inconsistent. The clearest published test is a rate check: GM's 2023/24 dual-clutch module calls the cooler-outlet reading faulty when its filtered gradient exceeds 700 °C per second, confirmed over five samples, as a Type B code (MIL after two trips). Mitsubishi's Twin Clutch SST in the 2009 Lancer uses a jump of 10 °C or more within 80 ms, lasting 400 ms; there the sensor sits in the transaxle-mounted control unit, so a returning code means replacing the transaxle. Ford lists P2741 as the consistency check of the TR9070 cooler-out sensor. Unlike P2742/P2743 the voltage stays in range; a loose pin or sensor drift is typical.

Likely causes

Contact resistance or loose pin causing signal jumps
Sensor B thermistor drifting or responding erratically
Fault in a control unit with built-in sensor (e.g. Mitsubishi TC-SST)

Symptoms

  • Warning lamp after repeated detection
  • Fluid temperature B jumps on the scan tool
  • Temperature-dependent clutch or cooler control restricted

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time1–6 h

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

Parts involved

trans fluid temp sensor b

Related codes

P2740P2742P2743P2744P0711

References: gsi.ext.gm.com, gsi.ext.gm.com, mitsubishitechinfo.com, fordservicecontent.com.