Hello, I just picked up a 2003 Diesel, 3500 and I have been getting some things repaired. I ended up replacing all of the injectors last week to get it ready for the annual emissions test. I went to get it tested and tagged and they told me it failed with a P0111 / Air Intake Temp Sensor. The issue I have is the engine light is NOT on. Not really sure if that is an intermittent problem or what. Any suggestions would be appreciated. Thanks

 

Check the battery connections on the right side battery and remove and clean connectors, bad connections on battery. Also check connections on the solenoid for air intake heater.. Here is diagnostics but I seldom see IAT sensor go bad on these trucks.

 

On the second generation trucks, the IAT Sensor needed cleaning on a regular basis if you had an exhaust brake on the vehicle. I did not think this sensor was continued on the 3rd Gens as it's function was picked up by another sensor, I thought.

Had to edit my post again. They still sell the IAT for the 3rd Gen's. So I guess it still exists.

OH Yea, Welcome to the forum.



Dave

 

OK Thanks. I did check the battery terminals, and they were loose. I reset the codes and it has not reappeared yet. I will wait some key cycles and check them again. Thanks again for your help.

 

Is it possible the code would not clear on its own?

 

I had the same p0111 (with check engine light) fault come on today. I checked and cleaned the sensor to no avail, but I did notice that the right battery connections were a little corroded. Sure enough, cleaning the battery connections fixed it! BigIron70, I owe you a case of beer big-time. You just saved me $100 bucks.

 

Funny my code would not clear after tightening my terminals, but I guess with enough key cycles it did. Went through inspection just fine. Thanks for your help!

 

I use a small wire brush and mopar battery terminal cleaner. Remove both ground cables first, then positive. The battery terminal bolts are expensive so you don't want to let the corrosion go for too long before you clean them. After cleaning I use mopar battery terminal protector spray. Never let them get this bad

 

Yuck, looks like those batteries are ready for the garbage can.

 

I keep my engine compartment pretty clean, but I fought corrosion on the batteries almost since the truck was new. I finally replaced them with a set of Diehard Platinums and bingo, no more corrosion, zero, nada. I would have done it sooner if i would have known the difference it would make. The truck cranks over way better too. I guess since they are sealed, no corrosive gas floating around and growing the white stuff.

 

Yeah, some batteries are definitely worse than others for spewing out acid and making a mess everywhere, even when comparing different brands of lead-acid battery. It's a bit surprising that with all the advances in battery technology that lead-acid batteries are still so common on vehicles today. Cost is still the biggest drawback to the newer styles I guess.

 

Three weeks after my first P0111, my truck throws out P0111 (IAT circuit), P0107 (MAP sensor low input), P2509 (power down data lost), and P0073 (AAT sensor high voltage). So I checked my battery terminals again only to discover that the left (drivers side) battery was a little loose and just a little corroded. Cleaned it up and tightened it up and all the codes are gone! I hope that's all it was. Although the negative battery connection was a little loose, it didn't seem loose enough to cause the problems. I'm wondering if I'm just clearing the codes by disconnecting the battery and reconnecting, but I'm only doing one battery at a time so the power systems still have one battery to work from. ???