Question about 2004 GMC Sierra
The stepper motors on the dash board instrument panel are bad. There was faulty motors and you can buy them on ebay. In order to replace them you have to take the instument panel out, (go to youtube for the video) then you need to unsolder the old motors and solder the new ones in. I had never done something like this and took about an hour to replace two motors one on the gas guage and the other on the speedometer. They take the same stepper motor.
Posted on Apr 26, 2011
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Posted on Jan 02, 2017
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Apr 03, 2013 | 1997 Chevrolet C1500
The Vehicle Speed
Sensor 1 (output shaft rotation sensor) is mounted to the extension case
(from the outside of the case). The sensor outputs a pulse signal which
is transmitted to the TCM where it is converted to vehicle speed.
The transfer clutch
drum is connected directly to the rear wheel driving propeller shaft.
Vehicle speed sensor 1 on the AWD model detects rear-wheel speed.
Speed Sensor 2 provides vehicle road speed information to the ECM. The
ECM uses this data to properly determine ignition and fuel delivery
curves. The sensor consists of a reed switch and magnetic rotor turned
by the speedometer cable.
One rotation of the
magnetic rotor opens and closes the reed switch four times, producing a
digital signal which is converted to vehicle speed by the ECM. The
sensor operates whenever the vehicle is moving with ignition ON. As the
transmission rotates, the speed sensor sends a pulsed on/off signal to
The speedometer uses VSS 2 for it's signal.
Hope this helps (remember to rate this answer).
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