Where is the speed sensor located?

YOREY

MEMBER
2004 CHEVROLET TRAILBLAZER
2WD
AUTOMATIC
200,891 MILES

The vehicle runs descent until I stop and then try to go, very slowly to roll out. Sometimes when I'm at a stop it will cut off. I would like to know where speed sensor is located, oh yes, sometimes when driving I have to go to 1st gear then 2, 3 then drive. Thanks. Add images please.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

Anytime there is a power loss issue, the first thing I think of is a partially plugged catalytic converter. They can come apart internally and restrict airflow, causing power loss.

Take a look through this link and let me know if it mirrors what you experience:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Also, is the check engine light staying on while the engine is running? Let me know. Also, if it is and you haven't scanned it for codes, that is usually very helpful. Also, most parts stores will do it free of charge, so have it done and let me know what codes they retrieve.

Let me know.

Joe

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Friday, July 28th, 2023 AT 9:08 PM

YOREY

MEMBER
2 POSTS

Yes, engine light would be off then turn on and stay on now, I took it to auto parts store and it just had code for sensor. It was inspected in May 2023 and passed the exhaust test check. The light would come on at times then too but not as often. It didn’t come on during inspection.

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Friday, July 28th, 2023 AT 9:19 PM

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

Do you remember which sensor or what the code was?

Let me know.

Joe

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Saturday, July 29th, 2023 AT 8:14 PM

YOREY

MEMBER
2 POSTS

Don’t know what the code was, I will take it to the auto parts store and recheck. All gauges are good, but the back end of the SUV smells of a lot of fuel.

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Monday, July 31st, 2023 AT 5:42 PM

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

If you have a fuel leak, that can cause a power loss. Do you have anything under the vehicle that is wet or stained indicating a leak? The fuel line runs across the top of the fuel tank to the fuel filter. See pic below.

Let me know.

Joe

See pic below.

Image (Click to make bigger)