P2199 code meaning
Intake Air Temperature Sensor 1/2 Correlation
Powertrain system Generic code P21xx codes Check engine light
What P2199 means
P2199 compares two intake air temperature readings that should be close, typically one in the air mass sensor and one further downstream in the intake manifold or a combined pressure and temperature sensor. Each circuit can be fine on its own; the fault is the disagreement. GM sets it when the two values differ by more than 55 °C in 40 of 50 samples taken every 100 ms, as a Type B code with MIL after two trips (2016 and 2018 tables). VW's 2014 Touareg uses a much tighter limit of 10 °C between the two manifold temperatures. CARB requires such rationality checks for input sensors under (e)(15). Stellantis lists it among the codes addressed by a PCM update for the 2020 RAM 1500 with the 3.0 EcoDiesel V6; there, check the software level first. Circuit faults are P0111 to P0114 (sensor 1) and P0096 to P0099 (sensor 2).
P2199 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2199
- Check engine light on
- Usually no noticeable driveability change
- Scan data shows two clearly different intake temperatures with the engine cold-soaked
Common causes of P2199
- Most likelyOne temperature sensor drifted or contaminated
- PossibleCorroded connector or added resistance in one sensor circuit
- PossibleCalibration issue fixed by a PCM update (e.g. RAM 1500 3.0 EcoDiesel 2020)
- Less likelyStrong heat soak or hot-air leak near one sensor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intake air temperature sensorIat wiring
What each part of P2199 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 99 | The exact fault in that area. |
What to do next
- Note P2199 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2199
What does P2199 mean?
P2199 means "Intake Air Temperature Sensor 1/2 Correlation". P2199 compares two intake air temperature readings that should be close, typically one in the air mass sensor and one further downstream in the intake manifold or a combined pressure and temperature sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2199?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2199 fail an emissions test?
Yes, it can. P2199 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2199 to fix?
Difficulty: easy. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2199 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.