Powertrain, generic (extended)

P2D92 Starter/Generator Phase X Current Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D92 is set when the signal from the phase X current sensor of a belt or crankshaft starter/generator rises above the range the control electronics treat as valid. Such sensors, commonly Hall devices placed around the phase conductor, put out a voltage that tracks the current, so a value stuck near the top of the scale points to the circuit rather than to real current: a signal lead touching a supply voltage, a damaged connector or a sensor whose output has failed high. No manufacturer documents P2D92 publicly. The closest published logic is GM's eAssist belt machine, coded as drive motor A: a reading above 440 A within about 42 ms, Type B over two trips, after which current control carries on without the sensors. Low side: P2D95; Y and Z: P2D93, P2D94.

Likely causes

Phase X sensor signal wire shorted to a supply or reference voltage
Current sensor output failed at the upper end of its range
Damaged, corroded or water-contaminated connector at the starter/generator
Fault in the evaluation circuit of the starter/generator control module

Symptoms

  • Warning lamp or MIL, often only after the fault has been seen on two trips
  • Reduced electric assist and weaker restarts after automatic engine stop
  • Automatic stop-start no longer active

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

P2D95P2D93P2D94P2DC1P2DC2P2D98

References: gsi.ext.gm.com, powersystemsdesign.com, law.cornell.edu.