Skip the auto shop - Our mechanics make house calls

P3485 OBD-II Trouble Code: Cylinder 11 Exhaust Valve Control Malfunction

check engine light

P3485 code definition

P3485 is the universal code for Cylinder 11 Exhaust Valve Ctrl Circuit/Open, denoting a problem detected in cylinder 11. Other cylinder exhaust valve codes may be present as well.

What the P3485 code means

Engine cylinders typically have either two or four valves each – intake valves bring fuel to the engine, while exhaust valves carry fuel vapors away. The timing of these valves opening and closing is closely controlled and monitored by the computer’s engine, either a PCM (powertrain control module) or ECM (engine control module).

The computer receives messages from the valves, in the form of voltage signals. When cylinder 11’s exhaust valve control circuit sends a signal outside of the expected parameters, the vehicle will set code P3485.

What causes the P3485 code?

A number of conditions may cause this DTC to set:

  • A bad cylinder 11 exhaust valve control solenoid
  • A loose connection in the circuitry
  • An open or short in the solenoid wiring
  • Clogs or dirt in the oil passages
  • A maladjusted timing chain or belt
  • A camshaft actuator fault
  • Compromised oil pressure as the result of low oil levels

While it is possible that any DTC could be a side effect of a faulty PCM or ECM, this is a rare occurrence. The cause is most frequently related to things like wiring or solenoid issues.

What are the symptoms of the P3485 code?

The Check Engine or Service Engine Soon Light typically illuminates. Other symptoms may include decreased fuel economy and sluggish acceleration. If your vehicle has variable valve timing (VVT), a mechanism which alters the timing of the valves opening in order to increase performance and decrease emissions, this function will probably be disabled as long as the code persists.

How does a mechanic diagnose the P3485 code?

The diagnostic procedure for this code may include:

  • Recording freeze frame data using a scanner, and checking for other stored codes
  • Clearing all codes, followed by road testing the vehicle to see if they return
  • Diagnosing and repairing any other events which occurred before P3485
  • Visually inspecting the exhaust valve control circuitry for corroded wires or loose or damaged connectors
  • Testing the resistance and voltage in the exhaust valve control solenoid and sensor

How serious is the P3485 code?

The vehicle will typically still operate when this code is stored, however engine performance may be affected. If you experienced compromised power or acceleration, this could cause a dangerous situation while driving. The best choice is to have the problem assessed and repaired by a qualified technician as soon as possible. This will help to not only prevent hazardous events while driving, but also to curtail any potential damage to other parts of the engine.

What repairs can fix the P3485 code?

In order to resolve this DTC, your mechanic may perform the following repairs:

Additional comments for consideration regarding the P3485 code

Diagnosing an engine code can involve a considerable amount of time, energy, and specialized tools. If you’re not sure you have the skill and equipment you need to complete the job, it’s best to let a trained technician handle the repair.

Not only do qualified professionals have the expertise and equipment needed to do the job efficiently and effectively, but they also know what to look for first in specific makes and models. Certain issues are common in particular vehicles and your qualified mechanic will know how to identify these quickly and easily.

Need help with a P3485 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

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...

Related questions

Q: power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The...

Q: Turbo wastegate stuck closed. Need solution.

Hello. P2261 is the code for an issue with the vehicle's turbocharger bypass valve, also known as the wastegate. If the computer detects an issue with the wastegate circuit or signal it will activate the Check Engine Light in order...

Q: How do I replace the airflow sensor on my 1985 olds 98

You definitely want to reset the computer when you make a repair like this. Resetting the computer will allow it to check the new component for proper operation and set a Diagnostic Trouble Code if there is still a problem....