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2008-02-03 01:18:39
2008-02-03 01:18:39

I just came in from the cold, fixing the same problem you are talking about (P0113). My 3.4L V6 01 Alero was hard shifting with the Service Engine light on. The Diagnostic Trouble Code was P0113: Intake Air Temperature Circut, High Input. The Trouble Code P1111 is a similar problem: Intake Air Temperature sensor circut intermittent high voltage. Hoping for the easy fix I bought and installed a new IAT sensor (AKA: Air Charge Sensor) at AutoZone for $13.99, but it didn't help anything.

The problem was the wiring leading to the sensor had broken. The IAT sensor shares the same 5V reference voltage with the Coolant Sensor and the Throttle Position Sensor. When the wire broke at the IAT Sensor, the TPS signal got messed up telling the computer to up the transmission pressure to "protect" the transmission. (Even though it felt like it was destroying the transmission shifting that hard)

The solution to the problem was to order a new IAT Sensor connector pigtail, GM Part #12102620/ AC Delco Part #PT307/ PICO Part #5616. I found mine at for under $8.00 after shipping. Stagger your cuts on the pigtail wires, heat shrink both butt connectors, and re-apply some electrical tape and you'll be back to smooth shifting in no-time!


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a broken dip stick wont cause hard shifting... the engine does not do the any shifting... your problem would be the transmission... check transmission....

In the 2000 Alero, it is fuse 34 in the engine fuse box, which is located near the battery. You can check the same fuse for the 1999 Alero and see if that is it.

you check the system for trouble codes.

The first two steps are check the fluid and check the computer for trouble codes.

The check engine light comes on when the engine computer detects a malfunction and sets a trouble code.

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depends on the alero. some have the 3400 v6. some have the 2.4. some have the 2.2 ecotec. check for detailed info

The check engine light stays on when the engine computer has detected a malfunction and set a trouble code.

get a trouble code tester, autozone will check your car for free

yes check you vacum line in the back of your transmison

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I hade the same trouble with a 99 JGC with the 4.0 engine. I found it to be a solonoid inside the trans that kept it from shifting.

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If it came out of a Cavalier....Yes,they are the same. But other model's, like an Alero, No. This one has a different gear ratio and it will confuse the computer and set off trouble codes(check engine light)

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