P0EB4A/C Compressor Motor Phase U Current Sensor Range/Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EB4 concerns the plausibility of the phase U current reading of an electric A/C compressor. The value is in range but disagrees with what the controller can work out for itself: in a motor fed by three wires the phase currents must add up to roughly zero, and each phase should follow the commanded current pattern. A standing offset or a wrong gain while running are typical findings. No manufacturer documents P0EB4 publicly. GM's 2011 Volt looked for offsets on its compressor phases only with the motor stopped (plus or minus 68 A, older codes P0D7A and P0D7B). A weakening sensor element or inverter board is the usual cause, so the compressor assembly gets replaced. Electrical faults of phase U are P0EB1 to P0EB3.
- What you may notice
- Compressor runs roughly or noisily before switching off
- Reduced or intermittent cooling
- Likely causes
- LikelyOffset or gain drift of the phase U sensor
- PossibleAgeing measurement circuit on the inverter board
- RareWinding fault in the compressor motor distorting the currents
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.