Powertrain, generic · Hybrid propulsion

P0A49 Drive Motor B Position Sensor Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A49 covers short dropouts or jumps in the motor B resolver signal that are too brief to count as a lasting loss, low or high fault. No manufacturer documents this code publicly. The motor A twin P0A43 is used by Stellantis on the Pacifica Hybrid, where dealers must check bulletins and reflash the hybrid control processor before replacing the power inverter module. GM shows on the Bolt that a slightly spread resolver terminal can cause brief signal loss and a sudden loss of drive, and forbids splicing resolver connectors because the circuits are sensitive. CARB 1968.2 requires detection of intermittent circuit faults of drive components. P0A45 is the permanent fault. Expect a warning that may clear after a restart.

Likely causes

Loose or spread terminal in the motor B resolver connector
Chafed or stretched resolver wiring near the rear axle or subframe
Moisture in the connector causing intermittent leakage
Hybrid control software needing an update

Symptoms

  • Hybrid warning or MIL that comes and goes
  • Brief loss of second-motor drive, often over bumps
  • Code stored as history without current symptoms

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor b position sensorwiring harnesshybrid control module

Related codes

P0A45P0A46P0A47P0A48P0A43

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.