P2BA3Starter/Generator Mechanical Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BA3 concerns the belt-driven starter-generator of mild-hybrid and stop-start engines: the controller has concluded that the machine does not turn the crankshaft or take torque from it as it should, although its electrics seem healthy. The exact detection rule is not published. FCA used the code on 2020 RAM 1500 and Jeep Wrangler 3.6 L eTorque models (bulletins 09-008-20 and 09-007-20), together with P0A92, after a batch of hydraulic belt tensioners let the belt slip; drivers saw the MIL and a flat battery. Audi lists P2BA300 for noisy or thrown belts on A4, A5, A6 and Q5 models and for squealing restarts on its 4.0 L V8 cars, where the generator itself was found intact and the tensioner damper is to be checked. Electrical faults of the machine have their own codes such as P2DC7.
- What you may notice
- Squealing, chirping or grinding from the belt drive, often at start
- Engine fails to restart after an automatic stop
- Battery runs flat because the machine no longer charges
- Electrical system warning or MIL on the instrument panel
- Likely causes
- LikelyWeak or defective belt tensioner or tensioner damper letting the belt slip
- LikelyWorn, misaligned or thrown poly-V belt
- PossibleDamaged idler or tensioner rollers
- RareMechanical damage in the starter-generator (bearing, pulley)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.