Powertrain, generic (extended)

P2DC1 Starter/Generator Phase X Current Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2DC1 is the general circuit code for the phase X current sensor of the starter/generator: the controller sees an electrical fault in the sensor path without, or in place of, a separate high or low verdict. CARB's OBD rule normally wants wiring faults and out-of-limit readings stored apart, yet it allows them to share one code when the sensor sits on a circuit board inside the control unit. Starter/generators with inverter and sensors built into the machine can fall under this, so P2DC1 may stand where P2D92 and P2D95 would otherwise appear. Mazda's starter generator, for one, splits its stator drivers into a U-V-W and an X-Y-Z group (bulletin 01-004-25). No manufacturer documents P2DC1 publicly. Range check: P2DC2; intermittent: P2D98.

Likely causes

Phase X current sensor on the integrated electronics board defective
Open or shorted lead between an external phase X sensor and the controller
Unstable 12 V supply or ground of the starter/generator electronics

Symptoms

  • MIL or system warning lamp
  • Starter/generator in a reduced mode or switched off
  • Stop-start and boost unavailable

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,000
Time0.5–4 h

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

Parts involved

starter generator phase x current sensorwiring harnessstarter generator control module

Related codes

P2DC2P2D92P2D95P2D98P2DC3P2DC5

References: law.cornell.edu, static.nhtsa.gov.