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Old 05-23-2012, 05:57 PM   #10
BigPapa
 
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Name: BigPapa
Title: Truckless
Status: Not Here
Join Date: Jan 2008
Location: Springfield, TN
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Posts: 5,008
I was going to suggest checking the system charge but Dan beat me to it. Also try jumping the pressure switch. If the alternator is charging and the tach works the PCM should be calling for it. May also be the Climate Controls in the dash.
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Scott

2003 Avalanche Z71

Common sense is like deodorant. The people that need it most never use it.
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