P0A8A14 Volt Power Module Current Sensor A Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0A8A covers short dropouts or jumps in the signal of the current sensor in the 14 V power module, the DC/DC converter that charges the 12 V battery in hybrids and EVs. The signal is valid most of the time but briefly leaves its range or changes faster than physically possible. No manufacturer documents this code publicly; GM's APM tables only show the hard limits for the same sensor (P0A88 below 0.5 A, P0A89 above 22.5 A or 45.25 A), which indicates what the intermittent check guards against. Loose terminals, chafed wiring near the module and vibration are the usual suspects. Compared with P0A88/P0A89 the fault often clears and returns, which makes freeze-frame data valuable.
- What you may notice
- Warning lamp that comes and goes
- Occasional 12 V voltage fluctuations
- Likely causes
- LikelyLoose or fretted terminals at the module connector
- PossibleChafed wiring with intermittent short or open
- RareIntermittent internal fault of the current sensor
- 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 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.