Powertrain, generic (extended)

P2DC5 Starter/Generator Phase Z Current Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2DC5 records a circuit fault of the phase Z current sensor in the starter/generator. A Z phase only exists on machines with more than one phase group. Mazda, for one, gives an integrated machine a second set of stator drivers labelled X, Y and Z, and CARB asks for circuit checks on such hybrid inputs. Since such sensors usually sit inside the machine electronics, a confirmed internal fault often means replacing the complete starter/generator, while a harness or plug problem can be fixed on its own. Rule out the external side first: supply, ground, connector and the low-voltage leads. No manufacturer documents P2DC5 publicly. Range check: P2DC6; high and low: P2D94, P2D97; intermittent: P2D9A.

Likely causes

Phase Z sensor inside the starter/generator electronics failed
Low-voltage connector of the starter/generator damaged or not latched
Supply or ground fault of the machine electronics

Symptoms

  • MIL and battery warning
  • No recuperation and no electric boost

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 z current sensorwiring harnessstarter generator control module

Related codes

P2DC6P2D94P2D97P2D9AP2DC1P2DC3

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