Powertrain
generic / SAE
P2743
Transmission Fluid Temperature Sensor B Circuit High
The second transmission fluid temperature sensor signal is above the upper diagnostic threshold. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / 43
Possible causes
- Open sensor element high
- Signal wire shorted to the 5 V reference medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 120–800 €
- Estimated time: 0.8–3 h
- Component: trans fluid temp sensor b
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012