P2199: Intake Air Temperature Sensor 1/2 Correlation

What does P2199 mean?

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).

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine light on
• Usually no noticeable driveability change
• Scan data shows two clearly different intake temperatures with the engine cold-soaked

Common causes

• High One temperature sensor drifted or contaminated
• Medium Corroded connector or added resistance in one sensor circuit
• Medium Calibration issue fixed by a PCM update (e.g. RAM 1500 3.0 EcoDiesel 2020)
• Low Strong heat soak or hot-air leak near one sensor

Likelihood is a general estimate across vehicles; your make and model may differ.