I recently purchased a 2005 Winnebago sightseer. When driving it home the service engine light came on. I checked the code when I got home and it’s. P1633 which everything I’m finding on the web says it’s the pcm keep alive. I’ve checked the fuse with a volt meter and looked at connections at the pcm. Everything looks good. Can anyone give me some insight where to look? I thinking it’s a grounding issue but don’t know where to check.
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Disconnect battery, remove all 3 connectores on the pcm, apply a LIGHT coating of dielectric grease on all connectors,making sure that every little hole in the connectors has a tad bit of dielectric grease, thr this first,may fix it
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Remember that dielectric grease is an insulator meant to keep water out. It is not a quick fix for a bad connection
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
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RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
Disconnect battery, remove all 3 connectores on the pcm, apply a LIGHT coating of dielectric grease on all connectors,making sure that every little hole in the connectors has a tad bit of dielectric grease, thr this first,may fix it
I have done that already. Still there. I’ve noticed that I have a deep cycle battery on the chassis could that cause a problem ?