Powertrain, generic · Transmission
P077E Transmission Fluid Temperature Measurement System Multiple Sensor Correlation
Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible
P077E is a plausibility check between several fluid temperature readings – for example sensors A and B, sump and valve body, or the module's internal temperature. If they differ by more than allowed after a settling time, such as a long stop, the code sets, without being able to blame a single sensor. No manufacturer document available to us uses it: GM checks each sensor alone (P0711, with the module temperature on the 6T70), and Ford has no multi-sensor check. A substitute value then limits converter clutch and shift adaption.
Likely causes
One temperature sensor drifting (aged NTC)
Contact resistance at a sensor connector or wire
Fluid level too low (sensor not wetted)
Module or software
Symptoms
- Transmission warning, possibly check engine light
- Converter clutch applies late or not at all
- Harsh cold shifts
Repair estimate
DifficultyMediumWorkshop job
Parts and labour€100–600
Time1–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
transmission fluid temperature sensorsensor wiringtransmission control module
Related codes
References: law.cornell.edu, gsi.ext.gm.com.