P0AFAHybrid/EV Battery System Voltage Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0AFA protects the traction battery from deep discharge: the pack voltage, or in some versions any cell voltage, has fallen below a temperature-dependent limit. GM's 2016 and 2019 tables set it after 320 of 400 samples (about 10 s) for the pack or 112 of 140 for a cell, Type A, and latch it so that only a technician command can clear it. GM bulletins name causes: degraded cell groups in 2011-15 Volt and ELR (19-NA-117), a blown fuse in the Bolt EV manual disconnect lever (18-NA-225), cell contamination in the 2015 Spark EV (17-NA-131) and repeated cranking that empties the Malibu Hybrid pack (PIC6229). A Ram eTorque parts notice names it for the 48 V power pack. Expect a no-start.
- What you may notice
- Vehicle does not start; restart blocked while the code is latched
- Reduced or lost propulsion before the no-start
- Plug-in charging not possible
- Likely causes
- LikelyDegraded or self-discharging cell groups
- PossiblePack drained by repeated failed engine starts or long standing
- PossibleOpen high-voltage fuse or manual disconnect
- RareLoose or high-resistance ground on 48 V systems
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €9,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.