Approx two months ago, the check engine light came on with a p0121, (tps related). I removed the connector, ran the wiring harness for nicks, chaffing, etc, and ohm'd out the sensor, everything checked out fine, including the reference voltage. I cleared the code, replugged the sensor connector, and the thing ran great till Dec 23, where at 70mph, there was a few hiccups, and the p0121 came back. Repeat diagnostics and all checked out OK, but I replaced the TPS with an Echlin module from NAPA. Ran great Til today, when it bucked, sneezed, and had a multitude of running issues, with a p0121. The running issues include: delayed 1-2 shift, downshift from OD lockup to 2nd gear (at 60mph) causing an rpm spike to 4500, and it would not upshift until I stopped and turned off the ignition; erratic choppy accelleration, gear hunting between 2, 3, OD, lockup and non-lockup. Also the auto door locks would lock at variety of speeds, not 15mph as usual.

When I got home, I pulled the connectors on the PCM to check for issues, and there were no outward signs (battery connected, ignition off). Interestingly, when I reconnected the PCM, the code was cleared and the Jeep started right up, with the CEL extinguished.

The battery is approx two years old. Ground straps look good. There is a DEI remote start module in the Jeep, which seems to function normally. Weather has been clear, no rain or snow, approx 25deg.

What is the consensus on this issue? I know the p0121 can also refer to the Map and TPS not agreeing. Is this a common path issue?

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05 Liberty Rocky Mtn.
02 Renny...Traded for 2010 F150, 8200 GVWR, Plow prep, Max tow
1983 Husq. Model 61, modded
Husq 335 XPT, trail saw, modded

Well, after having the computer scanned, and every inch of wiring checked, I have found a way to solve the problem....I traded it in on a new F150. Diagnostics pointed to a PCM and BCM issue. Now, this Rene has not lead the charmed life, so i cannot complain about it's service.

The F150 is much better suited to the way I use a vehicle, especially towing.

I still have my 05 KJ, which has about 95k trouble free miles.

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05 Liberty Rocky Mtn.
02 Renny...Traded for 2010 F150, 8200 GVWR, Plow prep, Max tow
1983 Husq. Model 61, modded
Husq 335 XPT, trail saw, modded

Had to replace the BCM in my 06 KJ. Poo Poo is what that is... Poo poo.

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Mike Smith
06 KJ Sport - PA - ONSFARI

OME 926/948 w/ OME Shocks, 3/8 Boiler, 1" LTT, a bit of Clevis lift
MOPAR Skids, Custom trans skid
Valley Roof Basket with Extension (when required), Homemade fence post crossbars with Thule system to compliment
Mastercraft A\T Something or another...