P0D6B code meaning
A/C Compressor Motor Voltage Sensor A Circuit Low
Powertrain system Generic code P0Dxx codes Check engine light
What P0D6B means
P0D6B reports that the high-voltage input reading of the electric A/C compressor sits below the plausible range. GM's first-generation Volt (2011–2015) and the 2016 ELR set it at 190 V or less in 30 of 60 samples at 50 ms, checked only with the contactors closed for over a second and fault-free. The 2016–2019 Volt uses below 27.75 V, judged by the compressor and passed on over GMLAN (2019: 4 of 5 s); all are Type B, MIL after two trips. Mitsubishi's Outlander PHEV flags under 205 V for 2 s while the battery shows 220 to 400 V; the 2019/2022 page header mislabels it as high, but the threshold is a low one, and the 2023 list calls it Circuit Low with MIL only. Suspects: compressor inverter, CAN link, hybrid ECU. A real supply loss is P0D6D.
P0D6B 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 P0D6B
- Check engine light after two trips (GM) or immediately (Mitsubishi 2023)
- Air conditioning stops cooling
- Battery cooling via refrigerant may be restricted
Common causes of P0D6B
- Most likelyVoltage measurement in the compressor inverter reads too low
- PossibleFaulty data link between compressor and hybrid controller (named by Mitsubishi)
- Less likelyHybrid or vehicle controller evaluates the value incorrectly
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor motor voltage sensor aWiring harnessAc compressor module
What each part of P0D6B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6B | The exact fault in that area. |
What to do next
- Note P0D6B 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 P0D6B
What does P0D6B mean?
P0D6B means "A/C Compressor Motor Voltage Sensor A Circuit Low". P0D6B reports that the high-voltage input reading of the electric A/C compressor sits below the plausible range. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D6B?
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 P0D6B fail an emissions test?
P0D6B 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 P0D6B to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0D6B 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.