P0AFA code meaning
Hybrid/EV Battery System Voltage Low
Powertrain system Generic code P0Axx codes Check engine light
What P0AFA means
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.
P0AFA at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0AFA
- Vehicle does not start; restart blocked while the code is latched
- Reduced or lost propulsion before the no-start
- Plug-in charging not possible
Common causes of P0AFA
- Most likelyDegraded or self-discharging cell groups
- PossiblePack drained by repeated failed engine starts or long standing
- PossibleOpen high-voltage fuse or manual disconnect
- Less likelyLoose or high-resistance ground on 48 V systems
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv batteryBms
What each part of P0AFA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| FA | The exact fault in that area. |
What to do next
- Note P0AFA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0AFA
What does P0AFA mean?
P0AFA means "Hybrid/EV Battery System Voltage Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0AFA?
Drive gently and only to a workshop. With P0AFA the car can go into limp mode (reduced power) to protect itself.
Will P0AFA fail an emissions test?
Yes, it can. P0AFA is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0AFA to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P0AFA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.