P0D7B code meaning
A/C Compressor Motor Phase U Current High
Powertrain system Generic code P0Dxx codes Check engine light
What P0D7B means
P0D7B is the second phase U current code of the electric A/C compressor. In GM's first-generation Volt (2011–2015) and the 2016 Cadillac ELR it sets when the phase U current sensor reads −68 A or less although the motor is stopped and no speed is requested, counted as 30 failures in 60 samples at 50 ms; Type B, MIL after two trips, with a 12 V reset required before a pass. A real current of that size at standstill is impossible, so the fault lies in the sensor or its evaluation on the inverter board, which normally means replacing the compressor. The A/C stays off while the code is active. GM's positive-direction code for the same phase is P0D7A; phases V and W use P0D7D and P0D7F.
P0D7B 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 P0D7B
- Check engine light after two trips
- Air conditioning stays off
Common causes of P0D7B
- Most likelyPhase U current sensor reading negative at standstill
- PossibleFault in the inverter's current evaluation
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 P0D7B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7B | The exact fault in that area. |
What to do next
- Note P0D7B 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 P0D7B
What does P0D7B mean?
P0D7B means "A/C Compressor Motor Phase U Current High". P0D7B is the second phase U current code of the electric A/C compressor. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D7B?
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 P0D7B fail an emissions test?
P0D7B 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 P0D7B to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0D7B 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.