Powertrain, generic · Hybrid propulsion

P0A4D Generator Position Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Sine, cosine or excitation line shorted to ground
Moisture or corrosion in the resolver connector
Shorted resolver winding inside the generator

Symptoms

  • Hybrid system warning and MIL
  • Generator disabled, engine-only or no-start condition

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,500
Time1–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

generator position sensorwiring harnesshybrid control module

Related codes

P0A4EP0A4BP0A4CP0A4FP0C66P0C6B

References: mitsubishitechinfo.com, patents.google.com, law.cornell.edu.