OBD-II code · Powertrain (generic, extended)
P2174 Throttle Actuator Control System - Sudden Low Air Flow Detected
A sudden, large drop in MAF/MAP signal not matched by a pedal change — typically intake restriction, MAF failure, or actively-stuck-closed throttle plate.
Is it safe to drive with P2174?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyIntake severely restricted
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Electronic Throttle Body, Mass Air Flow Sensor
Related codes
- P2172Throttle Actuator Control System - Sudden High Air Flow Detected
- P2171Exhaust Pressure Regulator Vent Solenoid Control Circuit High
- P2173High Airflow/Vacuum Leak Detected (Slow Accumulation)
- P2175Throttle Actuator Control System - Low Air Flow Detected
- P2176Throttle Actuator A Control System - Idle Position Not Learned
- P2177System Too Lean Off Idle Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.