P2173Throttle Actuator Control System - High Air Flow Detected
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2173 reports an air surplus that builds up gradually: across a longer stretch of driving the engine receives more air than the throttle model predicts, which points to a small leak, a cracked vent hose or a plate that no longer seals. FCA calls it High Airflow/Vacuum Leak Detected (Slow Accumulation). Bulletin 09-010-20 replaces the oil vapour inlet tube on the 2017-2018 Jeep Renegade with the 1.4 MultiAir turbo after leaks there set P2173-00 with jerking or limp mode, while 18-006-23 cures it on the 2019 Renegade 1.3 turbo with new PCM software, listed next to P2110. A Ram STAR case ties it to loose MAP connector terminals. A Ford patent shows how modelled and measured throttle flow are aligned. P2172 is the sudden version, P2175 the opposite deviation.
- What you may notice
- Check engine lamp after some driving
- Jerking or limp mode
- Start/stop system deactivated on some models
- Likely causes
- LikelyCracked or loose crankcase ventilation or oil vapour tube
- LikelySmall leak at an intake gasket or vacuum hose
- PossibleOutdated engine software (FCA reflash)
- RareMAP sensor connector with poor contact
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.