Powertrain, generic (extended)

P2D94 Starter/Generator Phase Z Current Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D94 completes the high-side series: the phase Z current sensor of the starter/generator outputs a value above its valid window. Inverters for 48 V starter/generators are built for three- or six-phase machines, and the controller relies on measured phase currents to set torque for engine restarts, boost and energy recovery. CARB's OBD rule requires input components, including the hybrid parts a manufacturer has to monitor, to detect wiring faults and readings outside the plausible range; a high-side code like this one is such an out-of-range finding. No manufacturer documents P2D94 publicly. Typical finds are a pinched lead or a loose plug at the machine, moisture in the electronics or a sensor defect, which often means replacing the starter/generator assembly. P2D97 is the low counterpart, P2D9A the intermittent fault.

Likely causes

Pinched sensor lead or loose plug at the starter/generator
Water ingress into the machine-mounted electronics
Phase Z current sensor defective, output reads too high

Symptoms

  • MIL or system warning lamp
  • Stop-start and recuperation switched off
  • Battery warning because the machine charges less or not at all

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

P2D97P2D92P2D93P2DC5P2DC6P2D9A

References: onsemi.com, law.cornell.edu.