20 Most Recent 2007 Dodge Ram 2500 Mega Cab Laramie Questions & Answers

Well, that sucks, for sure. The only commonality I can see between the engine, abs, brake light and speedometer is possibly a bad vehicle speed sensor. But when you throw in the codes for lost comm and cluster error, that muddied the water a bit. I am sure that there are separate fuses for the trailer wiring harness (my 04 chevy has separate fuses, surely an 09 dodge does) so I doubt trailer wiring could have done all this. A lost comm could be caused by a blown fuse. I would inspect every single fuse I could find in the entire vehicle, also, I have researched your problem a bit and have found a couple possible fixes. One is that the abs sensor on the rear differential is known to be sketchy and needs to be changed. The other is cleaning any ground cables that are connected to the fuse box on the front left fender. I hope this helps!

fan controler is bad .

Probably a bad connection to the engine computer. It's got two power feeds, switched/key and constant. The motor won't run without the switched key power on. Long story short, the computer can detect if the power leads aren't solid. Check the battery terminals, all the fuses, all the relays, and the PCM connector itself (if it's easily accessable).

Several things can cause this. On the inside. The controller could be bad. The wires could be shorted. a blown fuse. Under the hood. Wires could be bad. high and low sensors could be bad. LOW on refrigerant. Engine control module(ECM) could be bad. All of these will cause NO power to the clutch.

does the compressor clutch energize? this can be determined by listening in the engine compartment for the clutch to engage. there will be a clicking sound along with the engine adjusting rpm's for the added load of the compressor. check fuses and relays. if it is not engaging. the low pressure switch also may be faulty. it tells the compressor to turn on when pressure drops. which is normal. you can test it by using a paper clip to jumper the two terminals in the connector. it is located on the same a/c line as the low pressure fill port, between the evaporator, which is in the passenger compartment, and the compressor. if the fuses and relays are good, and the compressor doesn't cycle when the switch is jumped, change the low pressure switch. fuses and relays can be found in the owners manual. if you haven't got one, download one at dodge.com.

here's more info:

http://www.aa1car.com/air_conditioning.htm

Diesel or gas?

The owner's manual for the truck will have it. If you don't know where that is, look online. If you wait longenough, it will be cool enough to get by without it.

Dodge uses DC motors to actuate the doors on the HVAC system. Here's a link to a site that explains the problem and offers a series of potential solutions: http://www.heatertreater.net/Ram%2002-08%20Listing.html Hope this helps.

when was last service ? obviously something not right get the OBD code read as well

check the alternator make sure it is good,if good,then ground wire to light is shorting some where,probably pinched some where,have you done some work to car recently? that could be why

Check all the "spare" fuses in the fusebox. replace any that are empty with the proper grade fuse. If it pushes in like it's connecting, that may very well be your problem. If it just slides in and out, the slot is unused, and therefore, "spare".