P0A4D code meaning
Generator Position Sensor Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A4D means
P0A4D reports a generator resolver signal stuck below its permitted range, as caused by a sine, cosine or excitation line shorted to ground or a winding short. No manufacturer documents this code publicly. Mitsubishi shows how the fault is judged but files it under its own codes: on the 2023 Outlander PHEV a sine or cosine voltage at or below 2.0 V for 0.21 s sets P0C66 or P0C6B instead of P0A4D. A Bosch patent describes distinguishing a short to ground from a short to supply by the offset of the receiver coil lines, which is the basis for low/high splitting. CARB requires such circuit checks for hybrid input components. P0A4E is the high side, P0A4B the general circuit fault, P0A4C plausibility. The hybrid system typically shuts the generator down and warns the driver.
P0A4D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairAfter a drive cycle
Symptoms of P0A4D
- Hybrid system warning and MIL
- Generator disabled, engine-only or no-start condition
Common causes of P0A4D
- Most likelySine, cosine or excitation line shorted to ground
- PossibleMoisture or corrosion in the resolver connector
- Less likelyShorted resolver winding inside the generator
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Generator position sensorWiring harnessHybrid control module
What each part of P0A4D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 4D | The exact fault in that area. |
What to do next
- Note P0A4D 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 P0A4D
What does P0A4D mean?
P0A4D means "Generator Position Sensor Circuit Low". P0A4D reports a generator resolver signal stuck below its permitted range, as caused by a sine, cosine or excitation line shorted to ground or a winding short. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A4D?
Drive gently and only to a workshop. With P0A4D the car can go into limp mode (reduced power) to protect itself.
Will P0A4D fail an emissions test?
Yes, it can. P0A4D 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 P0A4D to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0A4D 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.