What Does P2199 Mean?
The PCM is detecting inconsistent temperature readings between two intake air temperature sensors. This indicates one sensor is reading significantly different from the other, suggesting a sensor or circuit fault.
Common Causes
40%
Failed intake air temperature sensor (IAT1 or IAT2)
30%
Damaged wiring or connector corrosion to one of the IAT sensors
15%
IAT sensor contaminated with oil or debris causing inaccurate reading
10%
One sensor exposed to abnormal heat source (exhaust proximity, turbo heat)
5%
PCM software issue or calibration error
Diagnostic Steps
1
Step 1: Use scan tool to view live data for both IAT sensor readings and compare values (should be within 10°F of each other)
2
Step 2: Inspect both IAT sensor locations and connectors for damage, corrosion, or contamination
3
Step 3: Measure resistance of both sensors at ambient temperature and compare to temperature-resistance chart
4
Step 4: Check wiring continuity and resistance from sensors to PCM, looking for shorts or opens
5
Step 5: Swap sensors if possible or substitute known-good sensor to isolate faulty component
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The PCM is detecting inconsistent temperature readings between two intake air temperature sensors. This indicates one sensor is reading significantly different from the other, suggesting a sensor or circuit fault.
The most common cause of P2199 (Intake Air Temperature Sensor 1/2 Correlation) is: Failed intake air temperature sensor (IAT1 or IAT2)
Typical repair costs for P2199 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. May cause slight performance issues or fuel economy reduction as PCM uses default values.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2199 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Air Intake
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
