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8 Posts
Hello everybody, I have a 2006 grand Cherokee overland, 5.7 hemi. A few months after I bought it, I started noticing funny quirks from time to time. Now, a couple years later, I'm thinking I have some computer problems but not too sure where to look.
Problem now: I have a TCM low input signal code. The jeep is acting fine at this point. It started dying on me last week, would run fine for 3 seconds then shut down. Battery was low so I replaced it, but still intermittently died on me. Cleaned the mass air flow sensor and that problem went away.
In the past:
So a common problem I've had is the trans temp light goes on randomly, and kicks the fans up. Usually it's after driving a bit. A few months after I bought it this started happening. I did find some trans cooler lines were seeping so I ended up hacking those off and putting hoses in their place. Fluid is fine now, but still have the trans temp issue. It doesn't happen much in winter, and since it happens after driving, I assumed my trans was overheating... but then it happened a few times when idling after starting a cold engine. Kept checking the fluid, no problems can be found, and it's been like that for 2 years now.
Other problems:
I've started getting service messages on the dash... service 4x4 system, and it won't shift into 4 wheel low because of that (quadra drive trans.) Also, it only happened one time but it scared the daylights out of me, one time I started it, and when I threw it in drive it didn't shift. Then, when I shifted into park, it began grinding loudly. I shut it off, restarted fine, when I shifted this time it began grinding again. I shifted again and again, the grinding got quieter, i looked underneath and the sound was coming from the trans pan, so I cut it off asap. Waited a bit, checked fluids, started it up and drove away... that never happened again.
Im a pretty handy guy... but I don't know that much at all about transmissions. It seems to me it would be something with the TCM either getting or giving the wrong signals. What I don't know is, how can I figure it out and how do I fix it.
My plan:
I've been doing some reading... I'm going to clean (or replace) the shifter control module, and probably the ignition switch while I'm at it. I've also read that dirt and corrosion can build up in the TCM terminals and relays, so I'm going to pull/ clean all the fuses, relays, tcm and pcm terminals (there is a notable amount of corrosion on the fuses.) I'll have to learn how to test for a short at the TCM terminal.... I'm hoping by the time I get this far the problem will be gone, but I'm not that confident.
Anything else? I'm sure I'm missing some easy troubleshooting steps...I would really appreciate any advice, tips, thoughts, ideas, suggestions... any info would help me ALOT!! Thanks
Problem now: I have a TCM low input signal code. The jeep is acting fine at this point. It started dying on me last week, would run fine for 3 seconds then shut down. Battery was low so I replaced it, but still intermittently died on me. Cleaned the mass air flow sensor and that problem went away.
In the past:
So a common problem I've had is the trans temp light goes on randomly, and kicks the fans up. Usually it's after driving a bit. A few months after I bought it this started happening. I did find some trans cooler lines were seeping so I ended up hacking those off and putting hoses in their place. Fluid is fine now, but still have the trans temp issue. It doesn't happen much in winter, and since it happens after driving, I assumed my trans was overheating... but then it happened a few times when idling after starting a cold engine. Kept checking the fluid, no problems can be found, and it's been like that for 2 years now.
Other problems:
I've started getting service messages on the dash... service 4x4 system, and it won't shift into 4 wheel low because of that (quadra drive trans.) Also, it only happened one time but it scared the daylights out of me, one time I started it, and when I threw it in drive it didn't shift. Then, when I shifted into park, it began grinding loudly. I shut it off, restarted fine, when I shifted this time it began grinding again. I shifted again and again, the grinding got quieter, i looked underneath and the sound was coming from the trans pan, so I cut it off asap. Waited a bit, checked fluids, started it up and drove away... that never happened again.
Im a pretty handy guy... but I don't know that much at all about transmissions. It seems to me it would be something with the TCM either getting or giving the wrong signals. What I don't know is, how can I figure it out and how do I fix it.
My plan:
I've been doing some reading... I'm going to clean (or replace) the shifter control module, and probably the ignition switch while I'm at it. I've also read that dirt and corrosion can build up in the TCM terminals and relays, so I'm going to pull/ clean all the fuses, relays, tcm and pcm terminals (there is a notable amount of corrosion on the fuses.) I'll have to learn how to test for a short at the TCM terminal.... I'm hoping by the time I get this far the problem will be gone, but I'm not that confident.
Anything else? I'm sure I'm missing some easy troubleshooting steps...I would really appreciate any advice, tips, thoughts, ideas, suggestions... any info would help me ALOT!! Thanks
