2000 Chevrolet Malibu P0113 Code: What It Means, Causes, and How to Fix It

Nichole, you're likely dealing with either a failed Intake Air Temperature (IAT) sensor or an issue with the wiring circuit. A scan tool is essential to diagnose this properly. Start by checking the physical connections — ensure the sensor is securely plugged in and that no pins are bent or damaged. Wiring issues can often be found at the connector ends. If you go to a dealership, they may save you time and money since P0113 problems are most commonly caused by a faulty IAT sensor, though wiring faults or ECM issues could also play a role. Good luck with your diagnosis!

If you know where the IAT sensor is located, make sure it’s fully plugged in. Sometimes during air filter service, the connection gets missed and not reattached. While this sensor isn’t expensive — around $10 — it can fail over time. Without a scan tool or multimeter, diagnosing the issue accurately is nearly impossible.

The Intake Air Temperature (IAT) sensor is relatively easy and inexpensive to replace — typically under $10 with no special tools needed. I once had a faulty IAT on my 3.4L V6 Grand Am, where the issue was actually a broken wire inside the plug. The resistance was extremely high. To test: Use your AutoZone scan tool and run real-time data while the engine is running. A reading of around 239°F suggests an open circuit; -39°F indicates a short to ground. Inspect the IAT sensor connector — sometimes the wire insulation breaks at the edge of the plug. You can either splice in a plug from another car at a junkyard or replace the entire connector. Another possibility is a broken wire in the main engine harness. On one vehicle, a water temperature sensor showed 0°F because the cable had broken inside its connector. I fixed it by cutting and splicing the wire — problem solved. In your case, a broken wire or poor connection is likely.

Just a quick correction: an open circuit will typically read -39°F, not a shorted circuit. This is important for accurate diagnosis.

For more detailed information on P0113 code, visit: http://www.obd-codes.com/p0113

Skydrol — thanks for the correction! I mixed up open and short circuits. I now believe a poor connection is more likely than a sensor failure. Replacing the sensor itself is inexpensive and straightforward, but a proper diagnosis should first rule out wiring or connector issues.

Given that the IAT sensor is reporting high voltage (which corresponds to low temperature readings), can we narrow it down between a faulty sensor versus a poor electrical connection?

A quick diagnostic test: Connect your scan tool, check live data for the IAT sensor. When the engine is cold, it should read ambient air temperature. Disconnect the sensor — if the reading jumps to -39°F, that indicates an open circuit. Then bridge the two wires with a jumper — if the reading goes to around +240°F, then the sensor itself is faulty. If the test shows normal readings after disconnection and bridging, it’s likely a poor connection or wiring issue. If not, replace the sensor as a simple fix.

Thanks for the clear explanation, Greg Garage! This is very helpful for someone trying to troubleshoot without professional tools.