# 2008 Chevrolet Express Cargo Van - CEL and limp mode

**URL:** <https://community.cartalk.com/t/2008-chevrolet-express-cargo-van-cel-and-limp-mode/169974>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet\
**Created:** [September 15, 2020, 4:31am UTC](https://community.cartalk.com/t/2008-chevrolet-express-cargo-van-cel-and-limp-mode/169974 "2020-09-15T04:31:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Rich02](https://avatars.discourse-cdn.com/v4/letter/r/7feea3/32.png) [@Rich02](https://community.cartalk.com/u/Rich02)\
**Post date:** [September 15, 2020, 4:31am UTC](https://community.cartalk.com/t/2008-chevrolet-express-cargo-van-cel-and-limp-mode/169974/1 "2020-09-15T04:31:04Z")

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I have a 2008 3500 GMC cargo van engine light comes on says reduced engine power and all of a sudden I can’t drive more than about 20 miles an hour. We change the throttlebody,the gas pedal and the module. Do you have any ideas thank you

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [September 15, 2020, 7:54am UTC](https://community.cartalk.com/t/2008-chevrolet-express-cargo-van-cel-and-limp-mode/169974/2 "2020-09-15T07:54:03Z")

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Get the codes read and post them here.

As you have already found out, just replacing parts gets expensive, seeing that there was nothing wrong with those parts you replaced.

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [September 16, 2020, 1:45am UTC](https://community.cartalk.com/t/2008-chevrolet-express-cargo-van-cel-and-limp-mode/169974/3 "2020-09-16T01:45:40Z")

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Have you verified proper power and ground at the various parts of the electronic throttle system . . . ?!

I believe they all have 5V reference . . . have you verified it’s good?

Have you verified the grounds are all good?

By the way . . . did you even retrieve any fault codes?

Or did you just replace parts based on the “reduced engine power” warning message?