P0D7AA/C Compressor Motor Phase U Current Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- Electric A/C compressors run a three-phase motor whose phase currents U, V and W are measured inside the inverter. P0D7A belongs to phase U. GM's 2011–2015 Volt and 2016 ELR test the sensors while the motor is stopped and the speed request is zero, when no current should flow: a phase U reading of +68 A or more in 30 of 60 samples at 50 ms sets P0D7A, Type B with MIL after two trips, and a 12 V reset is needed before it can pass again. In other words, GM uses the code for a current-sensor offset at standstill rather than for weak current during operation. The cause lies in the inverter's current sensing; the compressor normally stops. The negative counterpart is P0D7B, other phases P0D7C and P0D7E.
- What you may notice
- Check engine light after two trips
- Air conditioning does not start
- Likely causes
- LikelyOffset or failure of the phase U current sensor in the inverter
- PossibleFault in the inverter's current measuring circuit
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.