'02 six speed manual with 213000 miles
This is my first time posting here and would greatly appreciate any info I can get. I can't remember the code that started all of this six months ago but it came up that I needed a Throttle position sensor. I bought a new Cam bell unit with the TPS from O'Riellys because of the lifetime warranty. Shortly after the mechanic installed it I was getting a P0222 code (TPS 2 circuit low). The truck would run fine with once in a while a throttle catch that would bring up the check engine light and the 0222 code. Last week I got a second unit from ORiellys and had another mechanic put it in. I drove it 12 miles and shut it off. After starting again it went about 100 feet and no pedal. This time I get the p0121 code (TPS does not agree with map sensor). Loaded it on a tow truck and brought it home, unhooked the batteries overnight and this morning cleaned them up and put dialectric on them. I then tried the recalibration thing and nothing, still no throttle idle only. I would appreciate any help, I'm just looking for a starting point.
Thanks
Dave

 

Have the batteries checked by a good shop....most of these problems are voltage related...then check and clean all grounds you can find...free starting point and needs attention anyway.

 

Thank you Kurt. That is at the top of my list. I am over 70 so don't like to turn wrenches anymore and will take it to a good shop. I'm just trying to find out how deep I need to go in my budget. I love my Dodge.

 

At least for the 99 model year the +5V supply of the map sensor was also used for the tps sensor.
I fixed some trucks with erratic tps problems by changing the map sensor, if you can use a multi meter you can check the +5V sensor supply, if low unplug sensors until it comes up.

 

Thank you AlpineRam. There is a great shop in Homedale Idaho and I am going to take it to them as soon as they have an opening.

 

Dave, I too have a 2001.5 CTD HO 6 speed manual 2500 (close enough to yours) with 180K pretty much carefree miles. I bought it new thinking it would outlive me; and so far so good.
However, up jump da devil on a recent 22 state, 8300 mile truck camper tour of Leaf-Peeper country in the N.E. We live in on the west slope of the northern Sierra Nevada in California.
In Iowa, there were a couple slight jerks of the drivetrain. I've never felt that symptom before and quickly looked at my 'low fuel pressure idiot light' to see if i had lost either the lift pump or injector pump. No idiot on. I did notice that the check engine light had come on. I pulled over at a rest stop and pulled out my cheap engine analyzer tool and found the code that tripped the light was P0221. Except for an occasional code for "Turbo overboost", no check engine light has ever come on. We limped into a regional RAM truck dealer, luckily a few miles up the road which was supposed to have factory trained diesel mechanics on board and they quickly diagnosed the code P0221 (Mopar's diesel version of a TPS) as being a couple volts out of range. Not knowing anything about this since i never had to fix anything, they overnighted a new APP sensor from Chicago while we stayed in a hotel across the street from the shop. The APP sensor is simply a potentiometer on a stamped piece of steel with a plastic clip-on dust cover. With an oil change and the new part on, i parted with $1100 and drove on without incident for another 150 miles when, in the fast lane on I-90 westbound in S. Dakota, the engine went into the dredded, "Dead Pedal", where the engine returns to idle no matter what you do with the accelerator pedal. The check engine light was on again. Since we have a manual transmission with torque down to 300 rpm, I waited for a break in traffic and pulled over to the right hand shoulder idling in 1st gear. I turned the engine off and we called for a tow truck. In the meantime I called the dealer who put the APP sensor on and talked to the actual technician who told me, " Man, you're screwed." He said to wait a few minutes and the let the ECM re-adjust itself and allow you have pedal again. With out fixing the voltage irregularity, the code and dead pedal may return. Driving to the next RAM dealer we had a long afternoon waiting for the next report on what was wrong. The service manager said he has seen a lot of 2001-2002 Dodge HO 2500/3500's with 6 speed manual trannies come into his shop with this self same woe. Only those year? He had his hombre rub some dielectric grease on the plug on the APP sensor and recommended we try to get back to our home some 1800 miles away from there.
So, with bated breath, we camped and moteled our way home for 1800 miles expecting the other shoe to drop, but had NO FURTHER SYMPTOMS! I keep driving the truck hoping to have the symptom return to no avail. I did buy a spare aftermarket APP sensor from TMB Mechanical Service and Repair, 4816 Walters Hatchery Rd. Spring Grove PA 17362-7416 which is recommended to be much better and @ 1/4 the cost of the Mopar version i had installed. The strange twist on this story is the part that has not been talked about: the throttle pedal itself. When the code PO221 trips it is only the tip of the iceberg. There other circuits that are ganged to the APP sensor that don't register as separate. Since we live in the mountains, I never use the cruise control which is electrically up the pipeline from the APP sensor and the throttle pedal itself. The only time I've used it was on the freeway through IA and NE. I still think there is some kind of ground or voltage changing situation directly connected with the throttle pedal itself. It's just a hunch. I don't really know. Someone who does know can be found here: https://www.cumminsforum.com/forum/9...0122-code.html
Let me know what you come up with. jefe
I tried to edit this to say that we used the cruise control for a change and it is in the APP circuit. All I got above were a string of green parallelograms.
On the trip home i purposesly did not use the cruise control.

 

jefe4x4, thank you for the info. m going to do with it at this point.