TCM Codes and Limp Mode Questions - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 4 (permalink) Old 09-29-2019, 12:35 AM Thread Starter
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TCM Codes and Limp Mode Questions

Hello there, like many of us I am experiencing issues with Limp Mode about once every two weeks ONLY on startup on my 06 Commander. I’ve read every thread on this but nothing seems like a common fox out there. I’ve gotten a number of TCM codes like low voltage, speed sensors and trans over temp. I’ve replaced the TCM relay, starter relays, speed sensors and even the alternator thinking the low input was caused by not enough charge on the battery.

My battery is good but I am starting to wonder if my issue could be related to a faulty starter or the corroded yellow wire people commonly have? I just recently have turned the key and experienced nothing happen but if I keep cranking and it starts (this has happened about 3-4 times).

I know others have fixed their Limp Mode with the shifter bezel cleaning, silinoid packs and valve bodies but could those be problems if this is happening ONLY on startup and not ever when the car is driving?

I really need some advice as the dealership and independent shops have been unable to help due to the intermittent nature. I appreciate your time!
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post #2 of 4 (permalink) Old 09-29-2019, 10:49 AM
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Sounds like a corroded or loose ground strap some place. After all of those have been cleaned and snugged I would inspect the harness.
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post #3 of 4 (permalink) Old 09-30-2019, 05:19 PM Thread Starter
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Thanks for the advice. I looked at all the grounds around the top of the engine compartment today and cleaned and tightened everything but not sure where the additional ground straps are under the vehicle? Nothing seemed loose or hanging that was obvious.

I also checked my starter yellow wire and noticed a little bubble on the connector so I added some dielectric grease and think this could have been what was causing no cranking at times on the starter (unless the starter is starting to go out itself). I don’t know if that could cause any issues with TCM codes by it pulling too much power from it during startup and sending it into Limp Mode? I’ve also heard people spraying the TCM connectors with grease but it surely can’t be that easy.
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post #4 of 4 (permalink) Old 09-30-2019, 08:34 PM
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Quote:
Originally Posted by curtiscorcoran View Post
Thanks for the advice. I looked at all the grounds around the top of the engine compartment today and cleaned and tightened everything but not sure where the additional ground straps are under the vehicle? Nothing seemed loose or hanging that was obvious.

I also checked my starter yellow wire and noticed a little bubble on the connector so I added some dielectric grease and think this could have been what was causing no cranking at times on the starter (unless the starter is starting to go out itself). I don’t know if that could cause any issues with TCM codes by it pulling too much power from it during startup and sending it into Limp Mode? I’ve also heard people spraying the TCM connectors with grease but it surely can’t be that easy.
@curtiscorcoran; Please complete your user profile as directed below to comply with the forum rules for membership. Thank you.

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Last edited by Big Blue; 09-30-2019 at 08:51 PM.
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