P0600: Serial Communication Link Malfunction

When the Check Engine light illuminates on your dashboard, it’s time to use an OBD-II scanner to figure out why. There are a number of diagnostic trouble codes that could be the source of the problem. One of them might be the P0600 code.

What Does the P0600 Code Mean?

Code P0600 stands for “Serial Communication Link Malfunction .” Depending on the vehicle, the code may indicate an internal failure of the powertrain control module (PCM) or the inability of the PCM (or transmission control module) to communicate over the data network.

A Quick Note About Network Codes

Most network codes are “U” series codes (e.g., U1000). It’s important to note that many vehicles don’t even include the P0600 code in their libraries, but when it is a listed code, it typically means one of the modules related to the control of the engine or transmission has lost its ability to communicate with the other modules on the network, most specifically, P06xx codes relate to the PCM when it is responsible for the engine and the transmission.

Typically, transmission module codes will be formatted as P07xx codes as a rule of thumb. There may or may not be symptoms beyond the code itself, depending on the platform.

Note: The definition of code P0600 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What Are Possible Causes of P0600?

A PCM Serial Communication Link Malfunction might occur due to the following:

• Internal module hardware failure
• Module software in need of an update
• Circuit problems, such as damaged wires or poor connections
• Data network problems

What Are the Common Symptoms of the P0600 Code?

A vehicle diagnosed with the P0600 code might exhibit the following symptoms:

• Illuminated warning lights (check engine, transmission malfunction indicator, etc.)
• Engine performance problems, such as rough running and stalling
• Vehicle refuses to start
• Vehicle stuck in “limp mode”

How to Diagnose the P0600 Code

Diagnosing a diagnostic trouble code can be a headache for owners who aren’t car-savvy. Check out this informative video for an idea of what might be involved with diagnosing the code.

How to Fix the P0600 Code

Attempting to fix the P0600 code on your own might not be a good idea if you don’t have the tools and expertise needed for the job. That’s why we recommend hiring a professional technician or mechanic who knows how to get the job done. However, if you do have the necessary DIY skills, you could try to deal with the code yourself with the help of a repair manual or online repair database.

Other Notes About the P0600 Code

Professional technicians on Identifix have encountered the P0600 code in a variety of vehicles, including some from  Mercedes-Benz. For example, on one2010 Mercedes-Benz S63 AMG 6.3L, t, the scan tool and other modules could not communicate with the transmission. The P0600 code may also affect Subaru, Nissan, and Ford vehicles.

Where to Get a Replacement Powertrain Control Module

Internal failures in your PCM may cause the P0600 code to set. A faulty PCM can cause a lot of problems since it’s essential to most of your vehicle’s systems functioning properly. Naturally, you should replace a faulty PCM immediately. If you need a new PCM, you can turn to CarParts.com.

CarParts.com is dedicated to helping you find the parts you need at the best prices. We have a ton of great deals just for you. If you ever need help finding the best options for your vehicle, reach out to our friendly and helpful customer support team. They’re available around the clock to answer your questions. They’ll even tell you more about our price match and lifetime replacement guarantees.

It’s dangerous to drive around with a faulty PCM, so make sure to replace yours as soon as possible. Buy a new powertrain control module from CarParts.com now.