Question about GMC 2003 Envoy SLE

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2003 GMC Envoy speed sensor location

Need to know the location of the speed sensor on the transmission

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Most likely on the output shaft housing. It is most likely electronic and is usually the very furthest back electronic connector on the transmission. Since you did not provide the engine and whither it is 2WD or 4WD, I can't provide more exacting information.

Posted on Apr 22, 2014

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My envoy wont change from 2nd to 3nd and drive.changed 3 speed sensors no differents. Transmission reading 1700 rpms at neutral Please help

I always start simple, which means I would change the transmission fluid and filter and hope for the best.

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The hi speed is controlled by the fan relay located in the under hood fuse block. It isn't working.

May 16, 2014 | 2003 GMC Envoy

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Speed meter do not working

If the speedometer and odometer are not working, check the speed sensor in the transmission.

Aug 26, 2012 | 2003 GMC Envoy

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Where are sensors located on transmission of 2002 envoy

one in tail shaft which is speed sensor one on top temp sensor also one by shifter and two or three inside the pan at valve body

Apr 25, 2012 | GMC Vehicle Parts & Accessories

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Where is the transmission speed sensor located for a 2003 gmc envoy xl 4.3 v-6 4x4

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Jan 18, 2012 | 2003 GMC Envoy Xl

1 Answer

Delayed transmission shifting. Maybe a mechanical problem inside the transmission or problem with the on-board computer not communicating the correct timing through engine speed to the transmission....

Have you neglected the transmission or have you done regular services to it? Any Service Engine light? Slipping like that should show up and pop a code into it.

What you described sounds like the clutches are slipping.
Check the fluid level and smell it. Does it smell burnt and/or brown in color? That would be bad and the transmission may need a rebuild/replace.
If the level is low, top it off and hope for the best.

Sep 15, 2011 | 2003 GMC Envoy

1 Answer

I have a 2003 GMC Envoy and the check engine light comes on peridically. Auto Zone checked it and Code 0128 was the alleged issue. However, where is the sensor? No one seems to know the location of the...

This code relates to low coolant temperature not the 02 sensors. You should change your thermostat, it's stuck open and is not allowing the engine to properly heat up.

By the way, there are 2 92 sensors on Envoys and Trailblazers. One of them upstream is in the engine compartment right off the exhaust manifold, easy to replace. The other one downstream is next to the transmission drain plug in the exhaust pipe.

Oct 26, 2010 | 2002 GMC Envoy XL

1 Answer

I have a 2003 gmc envoy 4wd I have codes co237, co236 my abs light is on what does this mean

Codes indicate rear wheel speed sensor fault, this part of ABS system. A mechanic will need to inspect sensors.

Jul 07, 2010 | 2003 GMC Envoy

1 Answer

Where is coolant temp sensor located on 2003 gmc envoy v6? How do you replace it?

heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Jun 21, 2010 | 2003 GMC Envoy

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