P2741Transmission Fluid Temperature Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Warning lamp after repeated detection
- Fluid temperature B jumps on the scan tool
- Temperature-dependent clutch or cooler control restricted
- Likely causes
- LikelyContact resistance or loose pin causing signal jumps
- PossibleSensor B thermistor drifting or responding erratically
- RareFault in a control unit with built-in sensor (e.g. Mitsubishi TC-SST)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.