P0099 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0099 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0099 code.

OBD II Fault Code

• OBD II P0099

OBD-II Code Decreased engine performance is defined as a Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic

Diesel engines uses an Intake Air Temperature Sensor to measure the temperature of the air going into the charge air cooler. If the engine computer (PCM) determines that the reading from the sensor is not plausible, code P0099 will set.

Decreased engine performance Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P0099 Code

• Intake Air Temperature (IAC) sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue