P0A4C means the generator resolver delivers signals that are electrically present but implausible, so the computed rotor angle cannot be trusted. Mitsubishi documents the exact limits for the 2023 Outlander PHEV: the sine or cosine winding voltage must stay between 2.1 and 2.9 V; if either leaves that window for 0.28 s, or an internal status fault persists for 0.31 s, the generator control unit stores P0A4C. Typical triggers are a corroded or loose resolver plug, a chafed shield picking up noise, a winding that has drifted, or a faulty input stage in the power drive unit. P0A4B is the general circuit fault, P0A4D and P0A4E the hard low and high signal, P0A4F a sporadic dropout. Expect a hybrid warning, reduced power and possibly no engine start via the generator.
Medium severity. Can I keep driving?If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
Symptoms
- Hybrid system warning and MIL
- Reduced drive power or engine-only operation
- Engine start via the generator not possible
Most likely causes
- Corroded or loose resolver connector
- Damaged shielding letting interference onto the sine/cosine lines
- Resolver winding drifted out of tolerance
- Faulty resolver input stage in the power drive unit
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
- It affects emissions.
What each character of P0A4C means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- A: Hybrid or air and fuel
- 4C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0A4C?
If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
What causes code P0A4C?
The most common causes are: corroded or loose resolver connector; damaged shielding letting interference onto the sine/cosine lines; resolver winding drifted out of tolerance.
Related codes
- P0A4BGenerator Position Sensor Circuit
- P0A4DGenerator Position Sensor Circuit Low
- P0A4EGenerator Position Sensor Circuit High
- P0A4FGenerator Position Sensor Circuit Intermittent
- P0A50Generator Position Sensor Circuit Overspeed
- P0A40Drive Motor A Position Sensor Circuit Range/Performance
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.