P0D7A code meaning
A/C Compressor Motor Phase U Current Low
Powertrain system Generic code P0Dxx codes Check engine light
What P0D7A means
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.
P0D7A at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0D7A
- Check engine light after two trips
- Air conditioning does not start
Common causes of P0D7A
- Most likelyOffset or failure of the phase U current sensor in the inverter
- PossibleFault in the inverter's current measuring circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor motor phase uInverter
What each part of P0D7A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7A | The exact fault in that area. |
What to do next
- Note P0D7A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0D7A
What does P0D7A mean?
P0D7A means "A/C Compressor Motor Phase U Current Low". Electric A/C compressors run a three-phase motor whose phase currents U, V and W are measured inside the inverter. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D7A?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0D7A fail an emissions test?
P0D7A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D7A to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0D7A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.