2002 F250 2 wheel drive Powerstroke Diesel.

Trying to figure out what would cause the Gas Gauge and Alarm to stop working.

Basically I can't lock/unlock the doors via the remote.

Also it always thinks that the Door is ajar...

Checked fuses and have had it checked over by a mechanic, but to no avail...

check for a common ground under the dash it will be a bolt with a few wires going to it. may need cleaned or reconnected