P0AFCHybrid/EV Battery Pack Sensor Module
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some hybrid packs carry a separate sensor module that measures block voltages and passes them to the battery controller; Toyota calls it the battery voltage sensor or battery smart unit. P0AFC reports a fault of this module itself, such as a failed self-check or disturbed data transfer. Toyota documents it for the 2012-2015 Camry Hybrid in tech tip T-TT-0359-15 (repair manual entry P0AFC-123): an aftermarket antenna in the trunk, for example for CB radio, can set the code, and relocating it is the first step before following the regular diagnosis. CARB requires hybrid battery inputs to be monitored. Without valid block voltages the hybrid system usually shuts down or limits power.
- What you may notice
- MIL and check hybrid system warning on
- Hybrid drive disabled or reduced
- Code may return when the radio transmitter is used
- Likely causes
- LikelyRadio interference from an aftermarket antenna near the battery (Toyota Camry Hybrid)
- PossibleBattery voltage sensor module internally defective
- RareSupply or communication wiring of the sensor module faulty
- 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: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.