Fault Family System: Powertrain (P-Codes) 24 SAE Codes

Starter Generator Phase Current Circuit

Diagnostic & Technical Explanation

Code P2D92 (Starter/Generator Phase X Current Sensor Circuit High) covers the individual phase-current sensors (X, Y, Z, and on six-phase units U, V, W) and the field excitation current circuit on a belt- or crank-mounted starter/generator, flagging a circuit fault, an out-of-range reading, an intermittent signal, or a correlation mismatch between phases or the unit's own position sensor. Because this unit alternates between motoring (engine start/torque assist) and generating, the most common causes are a corroded phase-lead connector at the unit's power terminal block, a damaged current sensor from vibration, or chafed signal wiring near the belt-drive area.

These 24 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 24 times.

Codes in this family (24)

Code	Definition	Repair coverage
P2D92	Starter/Generator Phase X Current Sensor Circuit High	4 ranked fixes
P2D93	Starter/Generator Phase Y Current Sensor Circuit High	4 ranked fixes
P2D94	Starter/Generator Phase Z Current Sensor Circuit High	4 ranked fixes
P2D95	Starter/Generator Phase X Current Sensor Circuit Low	4 ranked fixes
P2D96	Starter/Generator Phase Y Current Sensor Circuit Low	4 ranked fixes
P2D97	Starter/Generator Phase Z Current Sensor Circuit Low	4 ranked fixes
P2D98	Starter/Generator Phase X Current Circuit Intermittent/Erratic	4 ranked fixes
P2D99	Starter/Generator Phase Y Current Circuit Intermittent/Erratic	4 ranked fixes
P2D9A	Starter/Generator Phase Z Current Circuit Intermittent/Erratic	4 ranked fixes
P2D9B	Starter/Generator Phase U Current Circuit Intermittent/Erratic	4 ranked fixes
P2D9C	Starter/Generator Phase V Current Circuit Intermittent/Erratic	4 ranked fixes
P2D9D	Starter/Generator Phase W Current Circuit Intermittent/Erratic	4 ranked fixes
P2DC1	Starter/Generator Phase X Current Sensor Circuit	4 ranked fixes
P2DC2	Starter/Generator Phase X Current Sensor Circuit Range/Performance	4 ranked fixes
P2DC3	Starter/Generator Phase Y Current Sensor Circuit	4 ranked fixes
P2DC4	Starter/Generator Phase Y Current Sensor Circuit Range/Performance	4 ranked fixes
P2DC5	Starter/Generator Phase Z Current Sensor Circuit	4 ranked fixes
P2DC6	Starter/Generator Phase Z Current Sensor Circuit Range/Performance	4 ranked fixes
P2DC7	Starter/Generator Excitation Current	4 ranked fixes
P2DC8	Starter/Generator Excitation Current Low	4 ranked fixes
P2DC9	Starter/Generator Excitation Current High	4 ranked fixes
P2DCA	Starter/Generator Excitation Current Intermittent	4 ranked fixes
P2DCB	Starter/Generator Phase X-Y-Z Current Sensor Correlation	4 ranked fixes
P2DCC	Starter/Generator Position Sensor Correlation	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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