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Old 01-06-2015, 05:16 PM
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Need advice on my 2006 GC Laredo

I purchased my 2006 Laredo four years ago with about 40k miles. Today, it has 138k miles and has been an awesome vehicle! Of course, there have been a few minor, normal, repairs (battery, alternator, starter), but all in all, I have no complaints. Except, when it rains, it pours apparently!

I've had a P0137 code (O2 sensors) for quite some time and have put off replacing them because, well, I assume it's not a huge deal based on what a few mechanics have told me. Not a major issue, but one that needs to be addressed.

A couple weeks ago, I was driving and all of the gear lights lit with a square around them and the truck didn't want to shift. I shut it off, restarted it, and all was fine. Took it to see if a code came up and got U0404. This happens every few days and fortunately, only once while on the highway. I've done a ton of reading on it and see that it's possible that the contacts on the shifter bezel may need to be cleaned, or, I may have to replace it. Ugh.

Yesterday, my battery light came on while driving. I stopped and had the battery checked and it was low, but good. They tested the alternator too and that came up and said "Volt Reg Failed" and "Diodes Passed". In doing my research, I see that there's no voltage regulator on this truck and that it's part of the PCM (oh yay....not).

So, all this to say, I'd love some input and advice. I just dropped the truck off at the stealership to have them tell me exactly what I need to have done so I don't guess at things. I know worst case scenario is that I will need both the shifter bezel replaced and a new PCM, but even the service writer said that he's doubtful the PCM is bad because they rarely fail. I found that to be a plus, and am hoping that maybe the alternator is just failing even though it's only a couple years old.

Any thoughts, opinions, advice from anyone??

Thanks in advance for your input!

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Old 01-07-2015, 10:42 AM
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Re: Need advice on my 2006 GC Laredo

I'm not sure about the bezel being cleaned, so I won't respond on that. But if you got a cheap remanufactured alternator from advanced or autozone, then I'm betting it's your alternator. From my experience, it's hit or miss with them.
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Old 01-07-2015, 04:09 PM
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Re: Need advice on my 2006 GC Laredo

Welcome to the forum. A few comments, FWIW.

First, if the O2's are bad/going bad, IMO, IT IS A BIG DEAL. You may not notice a big difference in the way the vehicle runs (other than poor fuel economy), but if you let the O2's continue to malfunction for very long (they usually fail to the rich side), you'll be replacing the O2's and the catalytic converters. Here's a thread I did a few years ago after I had an O2 Sensor problem. Maybe you can glean a little info. from it, as I did. Oxygen Sensors and Their Role in Engine Management--A Primer

Second, you may want to do a forum search to find the instructions for repairing the electronic shift module. This is a fairly common problem and, in most cases, is easily repaired by taking it apart and cleaning it. The stealer will gouge you bad, as they'll sell you a new one instead of cleaning it. This is understandable, as they would have to warrant the job.

Third, on the alternator, I'd check all the connections to the alternator, the battery, and the PCM. If all was well I'd do a conductance and load test on the battery to verify it is good. Then I'd check the alternator output voltage. Like simplejoe said, some of the budget rebuilds are junk.

Forth, on your comment, "I just dropped the truck off at the stealership to have them tell me exactly what I need to have done so I don't guess at things." Many of the dealers around the country (see numerous writeups on all Jeep forums) do exactly that....."guess at things", and they'll do it at your expense. There are many writeups where they just keep replacing parts until they stumble on the real problem. In many cases they're banking on the fact that you may not be knowledgeable enough to challenge any of their BS. Many will just read the code(s) and replace the indicated item WITHOUT properly troubleshooting the issue as per the FSM.

Again, welcome, and let us know what happens.
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Old 01-15-2015, 05:58 PM
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Re: Need advice on my 2006 GC Laredo

I have an 06 3.7L and had the same exact problem you are describing. Bad O2 sensor that I let go, then one day on the expressway I went to step on the gas and the car wouldn't move and started throwing up idiot lights. I had the codes check and it was the O2, shift bezel, and trans temp sensor. After I replaced the O2 sensor about 2 months ago I haven't had any of these issues reoccur.

Just a heads up, at least on my engine, I found the front O2 sensors to be a PITA to replace. I would have easily paid $50 per side (if not more) to have them done. If you have little hands and skinny arms it might be easier though.
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