Allison automatic transmission troubleshooting

This short guide is will hopefully help you diagnose simpler Allison Transmission problems. Allison Transmissions have been around for a hundred years and have set the industry standard for durability.

Modern Allison Transmissions come with a limp mode installed. This is a different shift table that allows the transmission to protect itself from catastrophic failure. This limp mode locks the transmission into third gear, and keeps the torque converter from locking up.

It also keeps the transmission from going into reverse! Keep that in mind. The limp mode is often activated by things an excessive of slippage by the transmission.

Here are some common conditions that can trigger a limp mode situation. Third gear should pull a load fast enough on the highway, but it can be challenging to get a load moving. If you are noticing this problem during hotter weather, you may be able to keep it from happening by installing a transmission cooler. Heat issues are the number one killer of this transmission. Do your best to protect the investment. Even just a little bit extra slip put into the tune, and an Allison Transmission can have problems.

It should solve the issue for you. It could be a false positive.

3 Common Allison Transmission Problems

The best way to do so is to get a code scanner and scan the code to wipe it. Modern transmissions are computer controlled, but if you are working on your tank they made transmissions for them in WWII or your classic vehicle you may wish to take a look at the vacuum lines.

If it feels like it is shifting toward the engine red line you could have it hooked to the wrong port. GM sent a letter to customers advising them to bring it in and get it replaced. Amazon has a pretty good compatibility chart on their TCM listing if you would like to check it out. Neutral safety backup switch issues are another common Allison Transmission problem on the GM Duramax versions. It is part number Make sure that you are performing the scheduled maintenance in order to get the most out of your transmission.

Most GM automatics come from the factory with non-synthetic fluid. You should make sure that you are using Allison approved fluids and changing them when they recommend. If you do that you may never even have Allison Transmission problems!!! Common Allison Transmission Problems Modern transmissions are computer controlled, but if you are working on your tank they made transmissions for them in WWII or your classic vehicle you may wish to take a look at the vacuum lines.Once logged in and you have uploaded your resume, it takes only a single click to bookmark any type of our content.

Mechanics Hub - November 25, Bookmark this Unfortunately you need to be logged-in to use bookmark system. Login Register. We will trace the exiting wire from the ECU that provides our Vehicle Speed Signal since that is the code and the speedometer is operating normally. Various operations are accomplished through this module like the exhaust brake, back up lights, neutral start, high idle and of course our vehicle speed signal runs through here to the Engine ECU.

After checking this out there is no connection between the Trans. I'll run a new wire to repair the open circuit, an easy fix. It's nice to get a gimme once in awhile! In the VIM you'll notice a series of relays and 2 fuses. If you experience a dead keypad and there is battery voltage to the VIM then check these fuses.

The other vehicle speed signal wire [tan wire ] comes from the trans ECU directly to the speedo. The speed signal to the VIM is the same number [tan wire ] since it comes from a different plug. This is where it all begins from the output shaft housing of the transmission. There is a toothed wheel rotating inside the housing that creates the signal to the sensor. The Allison Automatic Transmission is a very reliable unit when maintained properly. The wiring problems come and go but are easy to trace and repair with the right tools and wiring diagrams.

A Guide to Building a Mechanic Resume.Discussion in ' Trucks [ Eighteen Wheelers ] ' started by fatherof5Jan 10, Log in or Sign up. Find Trucking Jobs. Allison RDS, Any thoughts?

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Jan 10, 1. Just trying to get some feedback on this tranny in an OTR tractor application grossing 80k. Thinking about putting it behind the ISX Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided.

There is no charge for this service, but standard message and data rates may apply.

ALLISON AT Troubleshooting, Diagnostic Help!

Jan 10, 2. Go for it, you will not be diappointed. Though, you should look into the bigger ISX. What vehicle are you going to be getting this in? You would have much better luck with a Detroit and Allison combo. Remember, if you go to a Detroit Allison shop its a one stop shop. Let us know what you find.

allison automatic transmission troubleshooting

More information would help, thanks. Jan 10, 3. The ISX I'm specing a T with 38" Aerocab and weight is the motivating factor behind the smaller engine. I've been told the Allison can compensate for a lower horsepower engine but I don't understand how. My concern is the tranny shifting up and down with every Lil' hill and wearing out before trade time. Wondering if anybody has actual seat time in a similar spec, Thanx. Jan 10, 4. The torque converter will help launch the vehicle and compensates for reduced power starting off.

I don't know of anyone running an Allison OTR, most are using an automated manual if they want automatic shifting, but you don't get the torque multiplication with an automated that you get with a true automatic. What does the dealer say about it? Jan 10, 5. We are starting to see more Allison's in more bigger trucks in aus.

I havnt seen one on a highway truck but some truck and dogs run them. I own 8 Allison's, 6and 2 series. Myself I don't really like them, they run hot, use alot more fuel and they can't really handle partial throttle, they seem to hunt and can't make up there mind what gear they want to be in. They are quick, real quick. They keep the engine on boost during up shifts so they don't place a lot of strain on the driveline. They are easy to drive, any monkey can drive one, and they are really hard to break.

That's the reason we buy them.Typical problems of an Allison transmission include abnormal shifts, abnormal stall check speeds, slipping of the clutch and abnormal responses.

Other problems include the transmission throwing fluid out of the fill tube, excessive engine flares, intermittent noises and the retarder not functioning properly. Abnormal shifts in an Allison transmission happen during shifting at high and low speeds. At high shifting, this problem may be caused by a malfunctioning governor valve, leaking vacuum hose or broken mechanical actuator cable.

allison automatic transmission troubleshooting

A loose valve spring adjustment or stuck modulator valve causes problems during low and rough shifting. Leaking oil in the converter housing originates from a defective real oil seal, spoiled input charging pump or cracked converter assembly weld. A defective clutch, leaking clutching pistons and transmission fluid leaking past the control valve are the probable causes of the clutch slipping and chattering in only one range. Low fluid levels, broken seal rings on the front support hub and open lubrication valves cause slipping of the clutch in all forward ranges.

If the shift selector linkage is unhooked, it may cause abnormal responses in the transmission. Failure to engage the shift selector at the selector valve also causes unresponsive movement of the selector lever. High transmission fluid levels and a failed vacuum modulator may throw fluid out in an Allison transmission.

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A loose dipstick, clogged breather, improper dipstick marking and water in the transmission are also probable causes of the problem. Weak trimmer valves and leaking forward clutch seals may cause excessive engine flares. Lack of air supply, leaking air lines, malfunctioning check valves and a sticking pressure regulator valve are probable causes of a faulty retarder. Home World View. What Causes a Clutch to Burn Out?We make every effort to keep our service information current and accurate.

Because of the time lag involved with writing and printing processes, the transmission TCM may report a code that has not yet been added to this document. If you encounter a code that is not yet in this publication, please call Allison Transmission.

Go to the Table of Contents. Allison Transmission, Inc. Box Indianapolis, Indiana www. Description of the electronic control system components. Description of diagnostic codes, system responses to faults, and troubleshooting.

Wire, terminal, and connector repair information. Specific instructions for using many of the available or required service tools and equipment are not included in this manual. The service tool manufacturer will furnish instructions for using the tools or equipment.

Pushbutton Shift Selector Training Video (FULL)

Additional information may be published from time to time in Service Information Letters SIL and will be included in future revisions of this and other manuals.

This publication is revised periodically to include improvements, new models, special tools, and procedures. A revision is indicated by a new date on the title page and in the lower left corner of the rear cover. Check with your Allison Transmission service outlet for the currently applicable publication. Additional copies of this publication may be purchased from authorized Allison Transmission service outlets.

Look in your telephone directory under the heading of Transmissions Truck, Tractor, etc.

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Take time to review the Table of Contents and the manual. Reviewing the Table of Contents will aid you in quickly locating information. Allison Transmission is providing for service of wiring harnesses and wiring harness components as follows: Repair parts for the internal wiring harness and for wiring harness components attached to the.

Allison Transmission AT is responsible for warranty on these parts.Your automatic transmission is a critical system in your vehicle and needs proper care and attention by you to ensure long lasting operation. Many people are unaware that the automatic transmission can cost more to replace than an engine.

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This makes it important that you pay attention to the following symptoms and problems on this page if you want to avoid a major repair.

This article may ease your mind, or it may make alarm bells go off in your head. Either way we aim to help you with the information below. Armed with the right knowledge, you can make a well-informed decision about what to do if anything. Your Automatic transmission is a very complex mechanical and computer driven system.

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Because of that your automatic transmission can be more expensive to repair than your engine depending on your particular car. That means you are better off paying attention if one of these symptoms appear rather than ignoring or waiting for it to go away. It can cost you a lot of inconvenience and money if you neglect its service.

Your automatic transmission normally operates smoothly when shifting from gear to gear. You shouldn't feel any grinding, slipping or shaking sensations as your car switches gears.

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When a transmission is starting to have problems, these symptoms can seem insignificant. But, it is best to pay attention at this point because it will likely become worse with use. If you are already feeling pretty jarring sensations when the car shifts, it's time to get it in have us look at it.

Normally when automatic transmissions have damaged gears they progressively get worse. Summary: This is a more serious problem and time is very important. Be sure to get your car to a qualified automatic transmission specialist soon. When you put your car into drive or reverse does it respond immediately or is there a delay?

Does the car's transmission not engage at all when you put it in drive or reverse? These are both issues that may signal a problem. It could indicate a problem with your fluid whose protective properties have degraded and has become thick.

In this case a good fluid exchange could help you.Allison transmissions are custom-designed for several different industries and provide valuable power and work. However, even these revolutionary pieces of equipment can have problems. Do you know how to identify and deal with an issue that may arise with your Allison transmission?

Is your Allison transmission giving you trouble? Learn what might be happening and how to fix it here. However, you may actually be experiencing a failsafe instead. Which of these potential problems apply to your situation? This mode is triggered by anything that could cause severe damage to the transmission, including severe overheating or towing a very heavy load.

Pro Tip: Keep your Allison transmission well-maintained to avoid accidentally triggering limp mode. If your transmission is installed in an older vehicle, check the vacuum lines and other parts connected to the transmission. Allison transmissions built in the mids had a recall issued for their TCM module. If yours appears to have never been replaced, your best bet is to contact the manufacturer and ask about the replacement process.

Allison Transmission Fault Codes, Troubleshooting

With proper maintenance and normal usage, Allison transmissions will last you a very long time with few problems. But things may go wrong rather unexpectedly. Take advantage of our extensive warranty coverage to have your transmissions fixed or replaced with new models.

Connect with us to stay up-to-date on the latest in Allison transmission technology and maintenance advice.

allison automatic transmission troubleshooting