Powertrain, generic (extended)

P2173 Throttle Actuator Control System - High Air Flow Detected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Cracked or loose crankcase ventilation or oil vapour tube
Small leak at an intake gasket or vacuum hose
Outdated engine software (FCA reflash)
MAP sensor connector with poor contact

Symptoms

  • Check engine lamp after some driving
  • Jerking or limp mode
  • Start/stop system deactivated on some models

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–300
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

electronic throttle bodyintake manifoldpcv valve

Related codes

P2172P2175P0171P0174P2110

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, patents.google.com.