P2D93 code meaning
Starter/Generator Phase Y Current Sensor Circuit High
Powertrain system Generic code P2Dxx codes Check engine light
What P2D93 means
P2D93 reports that the current reading for phase Y of the starter/generator has climbed past its upper validity limit. Y is the middle letter of the X/Y/Z set this code series uses; the same list also has U/V/W variants (P2D9B to P2D9D), and no maker explains publicly how it assigns them. Not every design measures every phase. GM's eAssist belt system lists sensor circuit checks only for phases U and W, since with three phases one current can be calculated from the other two. A system that stores P2D93 therefore has a dedicated sensor on Y. No manufacturer documents this code publicly. Real phase currents do not get that high, so suspect a shorted signal lead, the sensor itself or the control module. P2D96 is the low fault, P2DC3 the general Y circuit code, P2DC4 the range check.
P2D93 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D93
- Hybrid or charging system warning on the instrument cluster
- Boost function during acceleration missing or reduced
- Engine restarts by the conventional starter or not at all after auto stop
Common causes of P2D93
- Most likelyPhase Y sensor signal lead chafed and touching a voltage-carrying wire
- PossibleInternal fault of the phase Y current sensor in the machine electronics
- Less likelyDefective input stage in the starter/generator control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Starter generator phase y current sensorWiring harnessStarter generator control module
What each part of P2D93 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 93 | The exact fault in that area. |
What to do next
- Note P2D93 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 P2D93
What does P2D93 mean?
P2D93 means "Starter/Generator Phase Y Current Sensor Circuit High". P2D93 reports that the current reading for phase Y of the starter/generator has climbed past its upper validity limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D93?
Drive gently and only to a workshop. With P2D93 the car can go into limp mode (reduced power) to protect itself.
Will P2D93 fail an emissions test?
Yes, it can. P2D93 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2D93 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2D93 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.