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 for $0.0 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $0.0 $20.0
Toyota $0.0 $20.0
BMW $0.0 $20.0
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.

Check Engine Light
trouble codes
P0609

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

(6869)

Rating Summary
6369
240
54
37
169
6369
240
54
37
169
 at YourMechanic

John

27 years of experience
926 reviews
John
27 years of experience
Volkswagen Beetle L4-1.8L - Check Engine Light is on - Alvin, Texas
John Conner knows what he’s all about. There’s no give up in him. He will look, look and keeps on looking until he finds the problem with your vehicle. Let me put it this way, if I have any other problem with my car, I will definitely call John. If anyone of my family or friends ask me if I know a mechanic. I will definitely recommend, John Conner. Thank You, John. You put a smile on my face.
 at YourMechanic

Mathew

6 years of experience
15 reviews
Mathew
6 years of experience
Honda Odyssey V6-3.5L - Check Engine Light is on Inspection - Philadelphia, Pennsylvania
He was very pleasant and understanding about what was going on with my car and the options on how and what to do to get it fixed. I will be calling to have it repaired
 at YourMechanic

Jordan

8 years of experience
29 reviews
Jordan
8 years of experience
Mitsubishi Outlander V6-3.0L - Check Engine Light is on - Lakeland, Florida
Great person and mechanic had the tools and knowledge to get to the malfunction quickly and accurately. Thanks
 at YourMechanic

Nicholas

11 years of experience
534 reviews
Nicholas
11 years of experience
Honda Accord V6-3.5L - Check Engine Light is on - Raleigh, North Carolina
Nicholas was very professional, considerate and he explains things very well and gave me some preventative measures to keep my car healthy. I highly recommend him!


More related articles

P0715 OBD-II Trouble Code: Input/Turbine Speed Sensor Circuit Malfunction
P0715 means the transmission will not be able to read the engine RPMs to shift properly causing transmission to shift hard or erratic.
P0776 OBD-II Trouble Code: Pressure Control Solenoid B Performance
P0776 code means there is an abnormality within either the electronic pressure control circuit or solenoid often due too dirty fluids or faulty parts.
P2296 OBD-II Trouble Code: Fuel Press Regulator 2 Control Circuit High
P2296 P2296 code definition Fuel Press Regulator 2 Control Circuit High What the P2296 code means P2296 is an OBD-II code for the engine control module (ECM) detecting the number 2 fuel pressure regulator control circuit is high indicating a...

Related questions

Can a exhaust leak trigger service engine light

An exhaust leak can trigger a Check Engine Light due to the fact that depending on the location of the leak, the leak itself is introducing more oxygen into the exhaust gases. As you may know the oxygen sensors which...

Does the VIN number have to be in the ECM for the vehicle to run?

Some new ECMs will give you a certain amount of free starts before it will not start unless the VIN is added. I am not sure if this is the case with your ECM but you have a dealer telling...

What is the best fix for a catalyst system efficiency below threshold (bank 2)

Trouble code P0430 is for a catalyst on the drivers side. The sensor after the converter may be bad and not responsive enough or the catalyst itself may be bad. The catalyst should be replaced if the converter rattles, there...

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