P0700 Duramax

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  • The P0700 code is informational. The code points to a general fault, not a direct fault. To correctly identify the problem, you will need to have a scan tool that communicates with the TCM to determine the problem in the transmission. When the P0700 code is present, the malfunction indicator lamp (MIL) may be illuminated. You may be seeing poor gas mileage or have transmission shifting problems.
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  • This video explains how to permanently fix the P0700 Transmission Malfunction error code. We explain what causes the problem, symptoms and then top 5 fixes.

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

Chevy/GM Duramax Diagnostic Trouble Codes (DTC) Diagnostic trouble codes (or fault codes) are codes that are stored by the on-board computer diagnostic system. These are stored in response to a problem found in the truck by the system. Here is a list of Chevy Duramax diagnostic codes to help you in figuring out what is wrong with your vehicle.

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
P07002003 duramax p0700

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.

Duramax

P0700 P0735 Duramax

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.

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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.

P0700 Duramax

Here’s how to tell what the color of your transmission fluid is telling you.

P0700 Chevy Duramax

Conclusion

P0700 Fault Code

The Code is almost always accompanied by another code. There are vehicle specific trouble codes and there are codes specifically for your manufacturer. Wps excel app. Good luck fixing your issue.