Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P2199: General Description
The powertrain control module (PCM) is equipped with two engine coolant temperature (ECT) sensors and two intake air temperature (IAT) sensors in order to measure engine temperature. The ECT sensor 1 / ECT sensor 2 and the IAT sensor 2 temperatures are nearly the same as the air temperature after sufficient time shut down to cool the system. Furthermore, the IAT sensor 1 / IAT sensor 2 values agree after starting the engine since they are located in the same air intake path. When the system is started after the prescribed time has elapsed, the IAT sensor 2 detects malfunction comparing the ECT sensor 1 and ECT sensor 2. When the sensors are normal, the PCM detects a malfunction in the IAT sensor 1 and stores a DTC comparing temperatures of the IAT 1 sensor and IAT 2 sensor after starting the engine.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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