P0A49Drive Motor B Position Sensor Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid warning or MIL that comes and goes
- Brief loss of second-motor drive, often over bumps
- Code stored as history without current symptoms
- Likely causes
- LikelyLoose or spread terminal in the motor B resolver connector
- PossibleChafed or stretched resolver wiring near the rear axle or subframe
- RareMoisture in the connector causing intermittent leakage
- RareHybrid control software needing an update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.