2002 ram 1500 4x4 with the 4.7 and 179,000 miles cel came on truck was running like hell, felt like rear ended coming out from under it, pulled the codes and only code was 1391, replaced cam position sensor, drove a total of 35-40 miles light comes on, same code, crank sensor was replaced last year. Truck runs great. Light was on a few weeks before it acted up. Should I have put the electrical grease on the plug? It did look damp/ wet when I unplugged it. Bought the sensor at orileys and crank sensor I believe from autozone. Any ideas?

 

Can I spray a degreaser in the plug or brake parts cleaner then use dielectric grease? Would the inside of the plug being damp cause intermittent loss?

 

Not sure on the newer trucks.... but.... the older fellers REALLY don't like aftermarket sensors in critical locations. They just don't seem to give the proper signals. I would be tempted to pick up genuine mopar sensors, see if that didn't improve its attitude.

 

Could dampness in harness cause it

 

Possibly.

 

I just picked up some dielectric grease, also I didn’t unhook battery before installing, was in a hurry since it was -12 but it’s unhooked now just waiting to hook back up

 

Light came back on just by letting it warm up

 

You can try resetting again, and see what happens, but, if it comes back, I would be real tempted to replace both the cam and crank sensors with genuine mopar pieces.

 

The cam sensor fixed the issue I was having, but I will be replacing crank sensor today and getting the grease in the pigtails, supposed to warm up here today instead of this - temps

 

Light back on, I’ve replaced both sensors, was out for about a week then back on, same p1391 code