P0AD4Hybrid/EV Battery Pack Air Flow System Insufficient Air Flow
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0AD4 is a system-level check of air-cooled traction batteries: the controller concludes that too little air passes the cells, for example because the cell temperatures rise faster than the commanded fan level allows, as a Honda fan diagnosis patent describes. CARB 1968.2 asks for a functional check of the battery cooling performance where feasible. Stellantis lists P0AD4 for the 48 V eTorque battery of the Ram 1500 (TSBs 08-033/034/035-24, 2022-24) and cures some cases with a battery pack control module software update. Unlike the fan circuit codes, P0AD4 is often caused by a blocked intake or duct. Expect a warning lamp and limited assist or electric power.
- What you may notice
- Check engine or hybrid warning light
- Reduced electric assist or start-stop not available
- Battery fan runs loud for long periods
- Likely causes
- LikelyCabin air intake grille or duct of the battery blocked (bags, clothing, dust, pet hair)
- PossibleBattery air filter clogged, where fitted
- PossibleBattery fan running too slowly
- RareBattery controller software sets the code falsely (Ram eTorque, fixed by update)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.