P2E7DA/C Compressor Control Module Internal Temperature Sensor B Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2E7D is the plausibility check for internal temperature sensor B of the electric A/C compressor controller: the reading is electrically in range yet conflicts with other temperatures. The test runs after a long rest, when all sensors should read alike. No manufacturer documents P2E7D. GM applies the method to its IGBT sensor (P0D76): the 2011 Volt tolerates 11 °C difference from ambient air and 7 °C from the CPU sensor after 21,600 s off, the 2019 tables 22 °C after 7,200 s in 8 of 10 s, Type B. Mitsubishi's Outlander PHEV compares two temperatures inside its front drive unit after a 3,600 s soak and fails at 18 °C; a Nissan patent judges an inverter switch sensor against coolant temperature. Drift, a still-warm compressor or a faulty reference can trigger it.
- What you may notice
- Usually no noticeable effect at first; fault stored after a cold start
- Compressor may derate early or shut off on a wrong temperature
- MIL on some vehicles after two drive cycles
- Likely causes
- LikelySensor B drifted or poorly coupled to its measuring point
- PossibleComparison value wrong, e.g. outside air or second internal sensor faulty
- RareCompressor still warm from recent use or preconditioning when the test ran
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.