What P0A49 means
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.
How the engine computer detects it
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.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
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
Common causes
- Loose or spread terminal in the motor B resolver connector Most likely
- Chafed or stretched resolver wiring near the rear axle or subframe Possible
- Moisture in the connector causing intermittent leakage Less likely
- Hybrid control software needing an update Less likely
How to diagnose P0A49
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: drive motor b position sensor, wiring harness, hybrid control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- A
- Hybrid and electric propulsion
- 49
- Specific fault
Questions drivers ask
Can I drive with code P0A49?
If the car drives normally, drive gently to a shop that services hybrids. If it shows a hybrid system warning, loses power or won't go into Ready, pull over and have it towed. Never touch orange high-voltage cables.
Will my car pass an emissions inspection with P0A49?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.