Skip the auto shop - Our mechanics make house calls

P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction

check engine light

P0608 code definition

The P0608 code is related to the control module for the vehicle speed sensor A, and it indicates that there is a malfunction.

What the P0608 code means

When the powertrain control module, or one of the many other modules in the vehicle, detects that there is a malfunction in the vehicle speed sensor output, this code will be stored. Some of the other modules that could detect and store this code include the transmission control module, the body control module, turbo control module, anti-theft module, antilock brake control module, and the fuel injection control module.

What causes the P0608 code?

The following are the main causes for the P0608 code to appear:

What are the symptoms of the P0608 code?

In many cases, the Check Engine Light will come on, but if the code is still pending in the vehicle, this light will not illuminate yet. Many drivers will notice that there are quite a few drivability issues with their vehicle when the code is present as well. The vehicle might be more difficult to shift, and it might have poor acceleration. It could run rough when idling as well.

How does a mechanic diagnose the P0608 code?

Mechanics who are diagnosing the P0608 code will use an OBD-II scanner and connect it to the vehicle’s onboard computer. This will show them more about the code and the issues with the vehicle. They will also reset the code to see if it comes back. If it does, then it generally indicates there is an actual problem. Unlike with other codes, the powertrain control module might actually be the issue for the code’s appearance. It is important to do a thorough diagnosis.

Common mistakes when diagnosing the P0608 code

Often, there are other codes that are present when the P0608 code appears. These could include engine misfires, fuel injector codes, transmission codes, and more. The technicians focus on these repairs, and they do not take care of the P0608 code, which has likely contributed to all of those other codes appearing.

How serious is the P0608 code?

The P0608 code can be a big problem. Not only can the issues it denotes cause other issues with the vehicle, you will also suffer from drivability issues with your vehicle until you have it repaired. It is very important to take your vehicle in for service whenever you notice anything out of place. In addition, you will want to take the vehicle in for regular check-ups to make sure there are no issues that you have missed.

What repairs can fix the P0608 code?

The following are some of the repairs that can be used for the P0608 code:

Additional comments for consideration regarding the P0608 code

One of the interesting things about the P0608 code is the fact that when it appears there is actually a good chance that it is due to a problem with the powertrain control module. With other codes, this is very rare. Regardless of what it is that is causing the code to appear and be stored in your vehicle, it is important that you do not ignore the problem or think that it will go away. The longer you wait the more other issues could crop up with the car or truck. Your best course of action is to work with a qualified mechanic who can diagnose the vehicle and repair the problem so you can get back on the road with the peace of mind you deserve.

Need help with a P3484 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: Cranks but won't start

This may happen for many reasons. There are in fact modes in your truck's computer that will trigger the ECU to shut the engine down in the event of some kind of failure that may cause major damage. This is...

Q: Check Engine Light is on 2004 Toyota Camry

Hi there. The Check Engine Light is an indicator that you have a problem in one or more systems of your car. You would need to have the computer scanned to see what codes are stored and have them diagnosed...

Q: The RPM is racing up and down when in park. Dashboard lights come on one at a time and then the car runs badly

Hi there. I understand your situation and concern. Fist we need the codes that are stored when the Check Engine Light comes on. Any diagnostic scan tool should be able to give us the codes that are set and give...