P0609 OBD-II Trouble Code: Control Module VSS Output "B" Malfunction

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0609 code

P0609 is a diagnostic trouble code (DTC) for "Control Module VSS Output "B" Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0609 DIAGNOSTIC Get a fair and transparent estimate upfront

P0609 code definition

The P0609 code means that there was a malfunction detected in a vehicle speed sensor output from the PCM or many supporting control modules, such as the TCM, the body control module, the instrument panel control module, the fuel injection control module, and several others.

What the P0609 code means

Many systems within a vehicle must monitor vehicle speed, and they use this information to calculate values related to their own function. These systems may be controlled by the PCM, powertrain control module, or they may be controlled by their own specific control module. If any of these modules detects that the data from a vehicle speed sensor is incorrect or inconsistent, the system will register a malfunction, and will store the code P0609 in the PCM.

What causes the P0609 code?

Most of the time, a faulty PCM is a very rare event. However, in the case of the P0609 code, a defective PCM driver could be the root cause. Other causes may include:

  • Poor connection in the electrical components of the PCM
  • Corroded, shorted, or open wiring, or faulty connectors, in the CAN bus harness
  • Loose control module ground strap
  • Broken control module ground wire
  • Defective CAN bus

What are the symptoms of the P0609 code?

If the P0609 code is detected by an OBD-II scanner, it is probable that the vehicle has had performance issues. Harsh shifting, stalling engine, decreased fuel economy, rough idling, and difficulty accelerating may all be experienced. The Check Engine Light will be illuminated after several drive cycles.

How does a mechanic diagnose the P0609 code?

After an OBD-II scanner detects the P0609 code, a technician should begin with a visual inspection of all the wiring, connectors, and other electrical components related to the CAN. Any damaged elements should be replaced, reconnected, or repaired as necessary. They should then clear the code and retest the system, to be sure that the Check Engine Light does not reappear. If the code is restored after this test, the mechanic can move on to further repairs.

Common mistakes when diagnosing the P0609 code

Often when communication codes, such as the P0609 code, are stored, it can cause a chain reaction that results in many other codes being stored in the PCM memory. If these codes are addressed out of order, starting with the most recently stored first, it can result in unnecessary repairs. Mechanics should use the freeze frame data in the PCM memory and begin diagnosing and repairing the oldest code first; they may find that clearing one code will cause many others to disappear.

How serious is the P0609 code?

If the P0609 code is detected, it is considered a moderately serious issue that should be addressed. While the vehicle should still be operational, and there may be no serious ramifications of putting off the repair, it can still have an effect on the vehicle’s operation, making it more difficult to accelerate or shift smoothly, and causing decreased fuel economy.

What repairs can fix the P0609 code?

Repairing the cause of a P0609 code may take many forms. These include:

  • Inspecting and repairing the electrical components related to the CAN bus.
  • Using a specialty scanner to check the various elements of the CAN bus, to pinpoint the exact issue.
  • Testing control module ground circuits for continuity and repairing any malfunctions.
  • Repairing or replacing faulty PCM drivers.
  • Manually testing the voltage between controller connectors, and repairing open or shorted circuits as necessary.
  • In extreme circumstances, disconnecting all control modules and testing for continuity.

Need help with a P0609 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.

trouble codes
P0609
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0609 code.

SCHEDULE P0609 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,156

Rating Summary
4,752
196
50
27
131
4,752
196
50
27
131

Al

21 years of experience
14 reviews
Al
21 years of experience
Nissan Pathfinder - Check Engine Light is on - Atlanta, Georgia
Al, was cool and very knowledgeable. Being direct and upfront always works. Al, is a credit to the company.

Xavier

10 years of experience
20 reviews
Xavier
10 years of experience
Chevrolet Equinox - Check Engine Light is on - Frisco, Texas
Xavier was GREAT!!! He made sure that I understood everything that he did to my vehicle and answered all my questions. Very thorough and even worked thru the light rain that we had. When I have to use this service again, I hope to be able to request him!

Luis

14 years of experience
52 reviews
Luis
14 years of experience
Kia Sorento - Check Engine Light is on - Las Vegas, Nevada
Luis did an excellent job in determining that this was a warranty issue on bad parts. He has integrity and is good at what he does. I would highly recommend him for any auto repairs that come up.

Reginald

36 years of experience
32 reviews
Reginald
36 years of experience
BMW 325i - Check Engine Light is on - Los Angeles, California
Reginald was incredibly helpful in helping me to diagnose several issues in my car, as well as repair issues to help me pass a break and light test. He even went so far as to come to the brake and light testing location so that he could ensure that the car passed and be there if anything else needed to be fixed on the spot. Absolutely would recommend him to anyone who is looking for an honest and knowledgeable mechanic!


More related articles

P0552 OBD-II Trouble Code: Power Steering Pressure Sensor Circuit Low Input
P0552 means there is an issue with the power steering pressure sensor circuit often cause by failure of the steering pump or poor wiring/connection.
P0107 OBD-II Trouble Code: Manifold Air Pressure (MAP) Barometric Pressure Sensor Circuit Low Voltage Input Problem
P0107 Trouble code definition Manifold Air Pressure (MAP) Barometric Pressure Sensor Circuit Low Voltage Input Problem What the P0107 code means P0107...
P2253 OBD-II Trouble Code: O2 (Oxygen) Sensor Negative Current Control Circuit High Bank1 Sensor 1
P2253 P2253 code definition O2 (Oxygen) Sensor Negative Current Control Circuit High Bank1 Sensor 1 What the P2253 code means P2253 is a generic OBD2 diagnostic trouble code (DTC) indicating a fault with the bank 1 sensor 1 O2 sensor....

Related questions

What are some inexpensive possible solutions for a P2506 code?

A good way to protect yourself in a used car transaction is to request a pre-purchase vehicle inspection. That inspection, carried out by a certified Mechanic, dispatched to your location, will give you very specific data regarding any current problems...

The code read P0341, how do I know if it's the chain or the cam sensor?

There is a technical service bulletin for the Acura TSX stating that the code may be caused from the timing chain getting stretched until the tensioner cannot keep it tight any longer. This is a result of not getting oil...

I have the check engine light on and checked for DTC's it says ECM set and CEM set

Hi there, thanks for writing in about your Volvo. There should be specific alpha numeric "codes" displayed on the Code Reader. Do you see/have those "codes"? These will help pinpoint any faults and assess the issue. I would recommend having...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com