P2D58Generator B Mechanical Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P2D58 reports that generator B, the second alternator of a dual charging system, does not deliver as commanded for mechanical reasons, most often because its drive slips. Such machines often sit on their own belt and idler. GM's customer satisfaction program N192255140 for 2019 Silverado medium-duty trucks with secondary generator option KHB shows how sensitive that mounting is: a bolt that missed its clamp load could work loose, so dealers fitted a new bracket for the A/C compressor together with the idler and inspected the belt. No manufacturer documents P2D58 publicly. Infineon's LIN regulator TLE8881-3 recognises a broken belt or stalled alternator when the phase signal stops swinging above a cut-in speed. Check belt, tensioner, pulley and bearings first. Generator A: P065C.
- What you may notice
- Charge warning lamp, low charging voltage
- Belt squeal or noise from the second alternator
- Likely causes
- LikelyWorn, glazed or oil-soaked drive belt slipping
- PossibleWeak tensioner or loose idler pulley mounting
- PossibleStiff alternator bearing or faulty overrunning pulley
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.