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P0600

Serial Communication Link

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By
KBB Service Advisor
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Reviewed by
Gary Hardesty

What Is the P0600 Code?

Symptoms
Causes
Seriousness
Can I Still Drive?
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Difficulty of Inspecting
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The P0600 code indicates that there’s an issue with communication between the powertrain control module (PCM) and one or more of the control modules that it communicates with. This is a very generic trouble code and only generally indicates that the system has noticed a communication issue with a control module; it doesn’t indicate which module it is or what impact that might be having on your system.

More About the P0600 Code

The P0600 code is not a code stored for every vehicle. In fact, many vehicles don’t include this code in their libraries and may give an array of other codes to indicate exactly what communication issue you’re experiencing. Many of these codes may exist within the U series codes, which tend to indicate network issues, showcasing a communication failure.

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What Are the Symptoms of a P0600 Code?

The P0600 code can cause a wide array of problems. The check engine light is the most common problem, but you might also notice other problems, such as general performance and shifting issues, an overall decrease in fuel efficiency, and sometimes no-start conditions or the vehicle stuck in the Limp Home mode. Again, symptoms vary widely, so don’t assume you know the underlying problem based on the symptoms.

What Are Some Causes of a P0600 Code?

Sometimes, the P0600 code occurs simply because there are issues with the vehicle’s wire connections. It may also be due to an issue with the software; you might need to run an update for your PCM, for example. In some cases, the P0600 code is due to generalized issues with the PCM, which may require a complete replacement. It’s important to do all the right investigations here so that you know the actual problem and don’t waste time replacing those that don’t actually have any problems.

How Serious Is the P0600 Code?

The P0600 code can be very serious, especially depending on the control module that it’s having difficulties communicating with. In some cases, the P0600 code can result in serious damage to the engine or in potentially hazardous driving conditions, like your vehicle suddenly having a difficult time shifting or steering. You should fix this code as soon as possible.

Can I Still Drive with a P0600 Code?

Some people are still able to drive with a P0600 code. In rare cases, you may not actually notice significant drivability issues. However, even if you are technically able to drive your vehicle, experts don’t recommend ignoring this code. Vehicle communication is paramount; it’s the main component of your vehicle’s proper functioning. If you’re having any issues with communication, then it’s vital that you fix them.

How Easy Is It to Diagnose a P0600 Code?

The diagnosis process for a P0600 code can be very difficult. This is mostly because there are a variety of issues that might be causing the P0600 code, but some of these issues are very expensive and difficult to fix. You need to be able to use specialty tools to determine the actual problem, which you may not have access to or knowledge of. An expert will be your best choice to fix these issues.

How Difficult Is It to Inspect a P0600 Code?

Inspection for the P0600 code is often very complex. To understand how the PCM is communicating with other elements of your engine, you need to have tools that can give you this information, which may not be something you’re able to do at home. It’s best to instead get help from an expert who will be able to help you understand and fix the problem.

Need Additional Help with Your P0600 Code?

An expert will always be the best option for getting help with your P0600 code. When you give the problem over to an expert, they’ll be able to understand the underlying problem, determine what’s actually happening, and give you a solution to fix it.

The first step should be to find a repair shop in your area. This can be especially important with the P0600 code, which can make it difficult or even impossible to drive, potentially requiring you to get a tow truck to tow your vehicle to the repair shop.

Additionally, especially if your vehicle is throwing more than just this code, the KBB OBD-II database can be a helpful resource. This resource is a great starting point if you’re just learning how OBD codes work in a vehicle or if you want some more insight into different codes.

P0600 Q&A

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