OBD-II code · Powertrain (generic)
P077E Transmission Fluid Temperature Measurement System - Multiple Sensor Correlation
Modern transmissions can have two or more ATF temperature sensors (sump, cooler return, valve body). After a long key-off soak they should all read approximately the same ambient. The TCM detects an implausible spread between sensors — one of them drifts or is wired wrong.
Is it safe to drive with P077E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor drifting outside tolerance
- PossibleSensors swapped after service
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.6–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Atf Temperature Sensors
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.