Diesel Place Since 2003 A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more! Common issue fix with the allison 5 speed tcm. Check the wiring to the tcm first. The pins are prone to falling out of the lock and backing out of the connec. The transmission of a vehicle which has suffered a transmission problem will send the P0700 code to the vehicle engine control module (ECM), which triggers the check engine light. It does not specify the problem, only that a problem has occurred. The A50 Transmission Control Module found in the 2009-2015 2500/3500 Duramax is prone to failure. The internal circuit board fails and is not serviceable. When this failure occurs you may observe messages such as Range Shift Inhibited, Service Brake System, Service stabilatrak, or might experience loss of gear shift indicator on dash, slamming.
One of the most common problems with the GMC Sierra is when it throws the P0700trouble code. A trouble code is a code thrown out by an automatic transmission whenever it detects that there is an issue going on. In the case of the P0700, it is a general code. This means that it should be accompanied by some other code that should tell you the specific problem. It is a OBDII code and not just a GM code. If you get no other code it means that there is probably something wrong, but there is no further information. Below you'll find some of the common causes for the P0700 in your Sierra. Good luck!
P0700: Fault Within The Transmission Control System
Sierra P0700 Code Explained
If you are scanning your vehicle right now, you should be looking for a second code that tells you what is actually wrong. Think about it like this.
- P0700 Says– 'Hey there's something wrong with this transmission.
- The Next Code(s) Say– 'I'm the actual problem going on with the transmission. I'm what you're looking for.'
The code will trigger the service engine soon light and may put the vehicle into limp mode. If your vehicle has gone into limp mode, it won't come back out until the computer detects that everything is operating within normal specifications. Here's more on what causes limp mode or how to fix limp mode.
GMC Sierra P0700 Causes and Symptoms
Since the P0700 doesn't indicate a problem (it indicates that there is a problem) here are some common problems that will cause the code to be thrown, as well as some of the more common symptoms that something is wrong with the transmission. If you feel there might be something wrong with the transmission, check out GMC Sierra transmission problems. There's way more on problems with it there.
Sierra P0700 Causes
- Bad transmission control module
- Faulty shift solenoid
- Low fluid
- Short circuit
- Bad valve body
GMC Sierra P0700 Symptoms:
- Transmission having a difficult time shifting
- Limp mode activated
- Service engine soon light/transmission light
- Don't get all the available gears
- Engine dying or running bad
What Does a P0700 Code Mean?
The code could mean any number of problems with the transmission. You may need to have the vehicle scanned further to figure out what is exactly wrong. Does the vehicle feel different? Or is it a situation where you wouldn't know anything was wrong if the light wasn't on.
Before you take it in to be looked at by a mechanic, you should at least check and make sure that the transmission isn't low on fluid. If you have felt a change in the way the vehicle has been driving, make sure you know the signs of low transmission fluid…
You don't want to end up spending a ton of money on taking it to a transmission repair specialist to find out that it could have been fixed just by adding some transmission fluid.
Sierra P0700 Code Explained
If you are scanning your vehicle right now, you should be looking for a second code that tells you what is actually wrong. Think about it like this.
- P0700 Says– 'Hey there's something wrong with this transmission.
- The Next Code(s) Say– 'I'm the actual problem going on with the transmission. I'm what you're looking for.'
The code will trigger the service engine soon light and may put the vehicle into limp mode. If your vehicle has gone into limp mode, it won't come back out until the computer detects that everything is operating within normal specifications. Here's more on what causes limp mode or how to fix limp mode.
GMC Sierra P0700 Causes and Symptoms
Since the P0700 doesn't indicate a problem (it indicates that there is a problem) here are some common problems that will cause the code to be thrown, as well as some of the more common symptoms that something is wrong with the transmission. If you feel there might be something wrong with the transmission, check out GMC Sierra transmission problems. There's way more on problems with it there.
Sierra P0700 Causes
- Bad transmission control module
- Faulty shift solenoid
- Low fluid
- Short circuit
- Bad valve body
GMC Sierra P0700 Symptoms:
- Transmission having a difficult time shifting
- Limp mode activated
- Service engine soon light/transmission light
- Don't get all the available gears
- Engine dying or running bad
What Does a P0700 Code Mean?
The code could mean any number of problems with the transmission. You may need to have the vehicle scanned further to figure out what is exactly wrong. Does the vehicle feel different? Or is it a situation where you wouldn't know anything was wrong if the light wasn't on.
Before you take it in to be looked at by a mechanic, you should at least check and make sure that the transmission isn't low on fluid. If you have felt a change in the way the vehicle has been driving, make sure you know the signs of low transmission fluid…
You don't want to end up spending a ton of money on taking it to a transmission repair specialist to find out that it could have been fixed just by adding some transmission fluid.
How to Check for the P0700 Code
The easiest way to check for any trouble code with a vehicle is to get a OBD2 scanner. They are cheap and worth their weight in gold. Otherwise, you can always take your car to the nearest discount auto parts store (Autozone, NAPA, etc..) and they'll be happy to go ahead and run the test for you.
Remember, once you find the code, it's not time to stop scanning. Let the scanner tell you all of the trouble codes that the vehicles ECM has and google them, just like you googled this one.
What To Do, or What Your Mechanic Will Do
The first thing that the mechanic will do is plug-in their OBDII scanner and see what code accompanies the P0700. As stated above, it can be anything. But, it's often thrown when there are shift solenoid issues.
After that they'll go ahead and clear the code and take the vehicle for a road test. This is normal. They want to recreate the problem. If it was a one-off thing, there's no reason to replace the part yet. If there is a real problem, the code will almost certainly throw again immediately.
Before you take it in, make sure that you check the transmission fluid. It's also a good idea to go ahead and have a look at the fluid itself. If the fluid is a rough color, or worse you find metal flakes in it, that can be a sign that the transmission is going out.
2001 Duramax P0700 Transmission Code
Here's how to tell what the color of your transmission fluid is telling you.
P0700 2005 Duramax
Conclusion
The Code is almost always accompanied by another code. There are vehicle specific trouble codes and there are codes specifically for your manufacturer. Good luck fixing your issue.
