P2D64 code meaning
Battery Charging System Negative Contactor C Stuck Open
What P2D64 means
P2D64 appears when minus charging contactor C does not close; the third charging path then lacks its return conductor and no current flows even with the plus contactor in. No manufacturer documents P2D64 publicly. The principle mirrors GM's Volt check of plus contactor A (P0D09): once charge and precharge contactors are commanded closed, charger-side voltage should rise, and under 10 V in 8 of 9 readings fails the test. Seen from outside, a missing minus connection looks just like a missing plus one, so telling P2D64 from P2D5D needs both coil drives to be checked. CARB requires charger faults that prevent charging to be detected on plug-in hybrids. Burnt contacts, a weak coil feed and software are typical. P2D63 is the welded variant.
P2D64 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D64
- Charging in the affected mode never starts
- Charging station aborts immediately
- Driving unaffected
Common causes of P2D64
- Most likelyMinus contactor C does not pull in or contacts burnt
- PossibleWeak coil supply from wiring or connector faults
- Less likelySoftware misreads the precharge result
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bcs neg contactor cWiring harnessBms
What each part of P2D64 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 64 | The exact fault in that area. |
What to do next
- Note P2D64 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 P2D64
What does P2D64 mean?
P2D64 means "Battery Charging System Negative Contactor C Stuck Open". P2D64 appears when minus charging contactor C does not close; the third charging path then lacks its return conductor and no current flows even with the plus contactor in. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D64?
P2D64 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2D64 fail an emissions test?
P2D64 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 P2D64 to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P2D64 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.