Question about 2004 GMC Envoy

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Speedometer is reading incorrectly. need to replace the speed sensor on the transmission or some where else.

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  • GMC Master
  • 6,826 Answers

Yes, I would start at the speed sensor on the transmission called the VSS (Vehicle Speed Sensor).

Also, are the tires the right size for the vehicle as indicated by the placard on the inside of the door?

The following is the example for some GMC Envoys (I had to guess on the engine size):

Vehicle Speed Sensor Removal & Installation To Remove:

  1. Disconnect the vehicle speed sensor connector. Vehicle speed sensor (A), Retaining bolt (B), O-ring (C) speedometer is reading incorrectly. need to - vsssensor.gif

  2. Detach the vehicle speed sensor from the transfer case.
  3. Remove the o-ring from the vehicle speed sensor.
To Install:
  1. Apply transmission fluid to the o-ring.
  2. Install the o-ring onto the vehicle speed sensor.
  3. Attach the vehicle speed sensor to the transfer case. Torque the bolt to 97 in-lb (11 Nm).
  4. Connect the vehicle speed sensor connector.
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Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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SOURCE: speed sensor replacement

That sounds correct. What is the questions?

Posted on Feb 11, 2010

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input and out put speed sensors tell the TCM and the ECM the difference between engine rpms and transmission input roms so that the correct gear ratio can be selected
A speedo sensor reads the out put shaft (drive line ) shaft and refers to road speed for speed and odometer readings and to calculate the fuel consumption rate
it is possible that you have replaced the wrong sensor
Talk with an accredited transmission specialist shop and have the problem diagnosed

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Well i'm going 60 mph but my speedometer read 70 plus for avery mile that i travel the meter read 1 1/3 so my car is gona hit 1k if i still friving like that?


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1993 toyota camry le 4cl speedometer wount work?


It can be faulty vehicle speed sensor .The sensor connects to the differential.The sensor in the transmission that tells the instrument panel how fast the transmission is turning. Sometimes that sensor breaks.
There is a speed sensor on the transmission that sends a signal to the
speedometer control on the back of the instrument cluster, and diagnosis is
pretty straightforward. The On-board Diagnostics Generation II (OBD II)
scan tools used by professional technicians should have the ability to read
the signal generated by the transmission speed sensor and therefore check
the function of the speed sensor. Even if the technician's scan tool does
not have this capability, the sensor can be checked with a volt meter at the
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If the sensor is putting out the proper signal, then the next step would be
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bad, then the wiring between the sensor and speedometer control is bad. The
most time confusing part of doing all these checks would be removing the
instrument cluster to get at the speedometer control, about a half-hour
total for all the checks.----------
If the needle moves you have a broken pinion or counter gear.If not, then I would replace both speedometer cables.---------------Thank you.

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When car warms up the speedometer goes up and down and transmission shifts funny and the engine cuts off


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