Code Definition

P0A49 — Drive motor B position sensor signal intermittent

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0A49

P0A49 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0A49 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0A49 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Drive Motor B is one of the high voltage motor generators in the hybrid or electric drive system, and its position sensor (typically a resolver) reports rotor angle to the inverter for accurate commutation and torque control. DTC P0A49 sets when the motor control module detects an intermittent or erratic position signal that momentarily drops out or falls outside expected continuity during operation. Intermittent faults of this type are usually caused by loose or fretting connector terminals, chafed wiring, a damaged cable shield, or a marginal resolver that misbehaves with vibration or temper...

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