# 1995 Chevrolet 2500 - Codes and sensors

**URL:** <https://community.cartalk.com/t/1995-chevrolet-2500-codes-and-sensors/163580>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [April 29, 2020, 9:28pm UTC](https://community.cartalk.com/t/1995-chevrolet-2500-codes-and-sensors/163580 "2020-04-29T21:28:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Christopher55](https://avatars.discourse-cdn.com/v4/letter/c/c77e96/32.png) [@Christopher55](https://community.cartalk.com/u/Christopher55)\
**Post date:** [April 29, 2020, 9:28pm UTC](https://community.cartalk.com/t/1995-chevrolet-2500-codes-and-sensors/163580/1 "2020-04-29T21:28:57Z")

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Check engine light on three codes one is iacv, put new one on, two tps put new one on and knock sensor put new one on transmission shifts hard from 1st to 2nd

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [April 30, 2020, 12:13am UTC](https://community.cartalk.com/t/1995-chevrolet-2500-codes-and-sensors/163580/2 "2020-04-30T00:13:02Z")

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Is the check engine light still on? The hard shift issue sounds transmission related. How long since the fluid was changed?