P2D74 code meaning
Battery Charging System Negative Contactor D Control Circuit Range/Performance
What P2D74 means
P2D74 says the coil circuit of minus charging contactor D answers commands in an unexpected way, although it is neither open nor shorted. No manufacturer documents P2D74 publicly, and no published GM table has a range test for charge contactor coils. One measure a GM patent proposes is timing: how quickly the coil current climbs to a set level after the driver switches on. A slow rise suggests extra resistance in the circuit or a changed coil. That patent runs its test at key-on or remotely by telematics. CARB asks for a functional check of monitored outputs where feasible. Typical are aged plugs, a degraded coil and a weak driver. P2D73 is the open, P2D75/P2D76 low and high, P2D6D the plus side.
P2D74 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D74
- Charging via contactor D stops intermittently
- Delayed contactor click when charging starts
- Code reappears after clearing
Common causes of P2D74
- Most likelyAged connector adding resistance to the coil circuit
- PossibleCoil of minus contactor D with changed resistance or inductance
- Less likelyOutput stage no longer delivering full current
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bcs neg contactor dWiring harnessBms
What each part of P2D74 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 74 | The exact fault in that area. |
What to do next
- Note P2D74 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 P2D74
What does P2D74 mean?
P2D74 means "Battery Charging System Negative Contactor D Control Circuit Range/Performance". P2D74 says the coil circuit of minus charging contactor D answers commands in an unexpected way, although it is neither open nor shorted. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D74?
P2D74 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2D74 fail an emissions test?
P2D74 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 P2D74 to fix?
Difficulty: workshop only. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P2D74 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.