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Pulled off what looked like a new speed sensor and tried a new speed sensor,no luck. Is there a speedometer gauge relay somewhere ?Pulled off what looked like a new speed sensor and tried a new speed sensor,no luck.
Is there a speedometer gauge relay somewhere ?
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Could be a few thing's . Hooking up a scan tool an checking for DTC'S - diagnostic trouble codes would be the first thing to do., viewing speed input data to the PCM - engine computer from the VSS - vehicle speed sensor . Also if the PCM see's this input it outputs this info on the class 2 serial data communication network to the instrument cluster . The instrument cluster has a microprocessor with logic programmed into it , an controls a electric motor to set the speedometer needle . GM had bad Stepper motors in their instrument clusters from 2003 to 2006 .
Does the vehicle shift ok , no running problems ? Any light's lit on the instrument cluster ? check engine etc.... How to repair GM Instrument Cluster Speedometer Gauge Stepper
if the odometer is working then the problem is with the speedometer head unit as the odometer gets its information from the same source as the speedometer. you can have the speedometer head checked and fixed if its fixable.
Its a connection problem. Also the sensor system in you blazer could be worn out. Too expensive to fix. Get a Garmen GPS. It tells you your current speed and all that other good stuff. Highly recomend.
The "cluster" means all of the things you see under the plastic cover in front of the driver, the 'gauges'. The term is a reference to the 'instrument cluster' including speedometer, tachometer, fuel gauge, idiot lights, temperature gauge, everything. Get a second independent opinion since this is very unusual. Most likely you have a blown fuse.
Check the sensor in your ******. most likely the only thing left. be sure to check the harness at your cluster for voltage to eliminate wiring or fuse faults.
GM had gauge cluster problems from 2000-2005. Bad stepper motors. On those units you have to replace the cluster or rebuild it with new stepper motors.
If it would of been only your speedometer I would of tell you to replace your speed sensor. But in this case you gas gauge stopped working as well so I would recommend taking your whole cluster to a mechanic he will try to fix those two items, otherwise you will need to replace the whole cluster, same thing happened to me. Good luck
The speed sensor can be tested with a scanner. Only take 10 minutes, If it works then your instrument cluster took a dive. Same thing with the RPM. If the scanner sees it then the cluster is bad. Getting it diagnosed properly is your best bet. You can get the cluster rebuilt for alot less than new. modulemaster.com does them.
My 96 did the same thing. The speed sensor is and was fine -- the problem is an open circuit in the wires inside the gauge itself.
The Chilton's manual has pretty good instructions on how to replace the instrument cluster. You can buy just the speedometer gauge, or an entire instrument cluster for $100 or so on eBay. Just be sure you get a cluster that matches your model and trim line -- the LX and DX have different clusters, and of course the automatic and the 5-speed are different as well.
Do be sure to disconnect the battery before you begin the project, as there's a (slim) chance you can discharge the airbags if you don't
Pulled off what looked like a new speed sensor and tried a new speed sensor,no luck.
Is there a speedometer gauge relay somewhere ?
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