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DTC codes / P2Dxx · Hybrid propulsion / P2D9B

P2D9BStarter/Generator Phase U Current Circuit Intermittent/Erratic

P2D9B indicates that the engine control module has detected an intermittent or erratic current signal on the phase U circuit of the starter/generator unit, which is the motor-generator used in mild-hybrid and stop-start systems. The computer monitors current flow through the phase U winding and flags this code when the signal momentarily drops out or jumps erratically, rather than failing completely.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaHybrid propulsion

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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