![]() ![]() What truck and what horsepower engine? What shift selector do you have? If it’s a new enough one you can pull codes through it. Posted 22:53 (#8560674 - in reply to #8560216) Subject: RE: 6 speed Allison transmission problems Also, check for blown fuses and replace them as needed.You are logged in as a guest. ![]() If that doesn’t work, pry open the housing around the wires and reconnect or replace any dislodged or broken wires. First, try disconnecting the power cable going into the selector and plugging it back again.Other than that, having no power and the shift selector flashing are the two other common problems I’ve seen people run into. And the fix often lies within the transmission fluid, often needing a top-up or replacement. Delayed or hard shifting is the obvious top among those, just like in every other automatic transmission. I’ve seen many faces of Allison transmission shift selector problems over the years. Only proper maintenance can prevent it in the first place. You’ll either have to replace it entirely or ask the company for a rebuild. Unfortunately, you’ve got nothing to do once your truck gets stuck in the limp mode. The problem is this switch is external and sensitive enough to read the gear ratio where it isn’t supposed to when struggling to cope with heavy loads. Its range switch connects to the solenoid valve bodies, switching between Park, Reverse, Neutral, and Drive 2, 1, and 3. This eventually leads to the transmission getting stuck in limp mode.Īnd inspecting the Allison 1000 multiple times, I’ve found a flaw in its design, which can often play a big part in leading to this sort of problem. However, the problem is the range sensor often misreads the ratio due to slips caused by excessive pressure and overheating. Basically, it was meant to lock the transmission into the third gear when potentially severe damage is detected, which is good. Stuck in Limp ModeĪllison introduced the limp mode feature in the 1000 transmissions in the mid-2000s. However, carrying out this replacement is no DIY job, and you must seek professional help to ensure proper installation. The latter is the former’s direct substitute with a heavier finned rear output shaft housing, which is much stronger and handles higher acceleration forces without trouble. The best fix I’ve found is replacing the 5-speed transmission’s weaker housing with that of a newer 6-speed one. It just isn’t strong enough to withstand high torque or acceleration, which may cause it to crack easily. I’ll only blame the housing’s design for this. You’ll want to ensure the blue and red connectors are firmly pressed against the bottom of the lock guide, which is the clear and red thing, and firmly into the pins.Īnd guess what? With no fluid in your transmission pan, the Allison 1000 is destined to fail.Due to the vibration and jerks of the truck, it pulls the pin past the lock, causing an intermittent connection.Your truck will likely have wiring harnesses up against the fan shroud with wires at a tight 90-degree angle. ![]() Just check the harness and the blue and red connectors. Well, all I do to be sure whether I need a new module or I just need to fix the wiring is check the harness. And they don’t even need replacements, either. ![]() But the funny thing is, I usually find the issue mainly with the wiring rather than the module. I get lots of visits from truck owners complaining about their Allison 1000’s control module going bad. Below, I’ve listed common problems I’ve encountered the most throughout the years and how to address them. Understanding the signs of Allison transmission going out is the key to diagnosing and resolving them. Troubleshooting Allison 1000 Transmission Problems troubleshooting Allison 1000 Transmission Problems. ![]()
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