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Headlights,tail lights stay on heater works key off
Hello All. I am looking for opinions if I am in the right direction of diagnosis. The head lamps and tail lights stay on all the time. The heater is powered up with key out of ignition. If I hook up the tech 2 and go into pcm, there is no communication until k... Login to read more. 
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| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 GMC Sierra 2500 SL 6.0L
| Engine | 6.0 L |
| Trans | 4-speed Automatic (Electronic) |
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