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Discussion Starter #1
i just put a hypertech on my 04.5 gmc and it showed a few codes.

I looked for a code list but couldnt find one.

here they are
C0035
C0040
P0670

truck is running fine, i just guess they were ghost codes i hope. lol
 

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C0035
C0040

these are speed sensor trouble codes. 35 is left and 40 is right

measure the resistance of the LF WSS where it connects to the chassis harness by the upper shock mount. GM spec is 700-10,000 ohms. If its open or shorted replace it. If it tests ok pull off the rotor and look at your hub you probobly have some rust built up under the mounting surface of the sensor causing the sensor to pull away from the reluctor wheel which will give a weak signal. In that case replace the sensor and sand the hub until all the rust is gone, be carefull not to get anything in side the hub
 

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Discussion Starter #6
i think P0670 is the glowplug module


when i brought the truck, it had that code. The guy i brought the truck from put a new one on from the local dealer, so i guess us driving it from one place to another to install it, made it come up again.


Thanks guys
 
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