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| Code p0121, 02 Lib Rene, 68k miles http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=58113 |
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| Author: | Straight6Jeff [ Sun Jan 09, 2011 9:12 pm ] |
| Post subject: | Code p0121, 02 Lib Rene, 68k miles |
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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| Author: | Straight6Jeff [ Mon Jan 24, 2011 3:40 pm ] |
| Post subject: | Re: Code p0121, 02 Lib Rene, 68k miles |
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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| Author: | bunkermonkeycw [ Mon Jan 24, 2011 4:18 pm ] |
| Post subject: | Re: Code p0121, 02 Lib Rene, 68k miles |
Had to replace the BCM in my 06 KJ. Poo Poo is what that is... Poo poo. |
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