If yours appears to have never been replaced, your best bet is to contact the manufacturer and ask about the replacement process. 3) TCM Module RecallĪllison transmissions built in the mid-2000s had a recall issued for their TCM module. If there’s anything out of place, switch them back and try again to see if you can duplicate the problem. If your transmission is installed in an older vehicle, check the vacuum lines and other parts connected to the transmission. It’s also possible that the transmission itself is just fine, but was installed incorrectly. This will also improve your vehicle’s overall functionality! 2) Hooked Up Incorrectly Pro Tip: Keep your Allison transmission well-maintained to avoid accidentally triggering limp mode. If you find yourself stuck in third gear with this model of transmission, it’s probably time to have it rebuilt. ![]() Unfortunately, a driver can’t reverse limp mode. This mode is triggered by anything that could cause severe damage to the transmission, including severe overheating or towing a very heavy load. The Allison transmission 1000 model has a feature called “limp mode”, in which the transmission locks itself into third gear. ![]() Which of these potential problems apply to your situation? However, you may actually be experiencing a failsafe instead. Your Allison transmission could be experiencing a part failure, in which case your best bet is to take advantage of the provider’s warranty. What Might be Wrong with Your Transmission
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