Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P3471 OBD-II Trouble Code: Cylinder 9 Exhaust Valve Control Circuit Low

P3471 OBD-II Trouble Code: Cylinder 9 Exhaust Valve Control Circuit Low

Check Engine Light

P3471 code definition

The P3471 code indicates that the PCM has detected a voltage reading from the cylinder 9 exhaust valve control circuit that is too low in comparison to the manufacturer’s specifications. Like the P3469 code, this code may be found alongside other 3400 series codes.

What the P3471 code means

In order to expel fuel vapors from the engine, each cylinder has valves that are controlled by the ECM. The function and timing of these valves are monitored closely, and any abnormality in the performance results in a signal being sent to the PCM. If the PCM sets the P3471 code, it means that the voltage reading from cylinder 9’s exhaust valve circuit was too low.

What causes the P3471 code?

There are several causes that could be behind the P3471 code. They include:

  • Faulty exhaust valve control solenoid
  • Low oil pressure
  • Clogged oil passages
  • Faulty camshaft actuator
  • Misadjusted timing chain or timing belt
  • Faulty PCM or ECM, in rare cases
  • Faulty, loose, corroded, or damaged electrical elements within the solenoid, such as wiring, connectors, and harnesses

What are the symptoms of the P3471 code?

In addition to the illumination of the Check Engine Light, the vehicle may run sluggishly, and the fuel economy may decrease.

How does a mechanic diagnose the P3471 code?

After an OBD-II scanner detects the P3471 code, the technician should repair any faulty electrical components first. These are common faults behind the P3471 code, and should not be overlooked. After this, and any subsequent repair, the code should be cleared from the system, and the system should be retested.

If the code returns to the PCM, the mechanic should test the exhaust valve control solenoid and sensor, and follow any procedures necessary to test all potentially faulty components until the cause is found.

How serious is the P3471 code?

While this code will not affect the immediate drivability of the vehicle, it can create an unsafe driving condition should the driver need a lot of engine power to make sudden maneuvers or pull heavy loads. This code should be addressed as soon as possible to ensure that no further damage is done to any components within the exhaust valve circuit.

What repairs can fix the P3471 code?

There are many ways that a technician can address a P3471 code detection. They include:

Need help with a P3471 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

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.


More related articles

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...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...

Related questions

Q: I had the catalyst converter replaced last year. Now the Check Engine Light is on again for O2 sensor. What do I do?

You may want to have a professional inspect the catalytic converter. When the Check Engine Light comes on for this, it does not necessarily mean that the catalytic converter has failed. This may be related to many other things as...

Q: Po155cnf bank 2 sensor heater circuit P1620cnf Also code

The P0155 is the oxygen sensor located on the rear bank of cylinders and before the catalytic converter. Given your mileage, both oxygen sensors (pre-catalytic converter) should be replaced. The pre-cat sensors have the most affect on fuel mixture, saving...

Q: Q: Stalling

Hi there: The EVAP system is comprised of multiple components. Although the gas cap removal is the easiest job to complete and the source of many of these problems, another common issue is caused by the EVAP vent solenoid. When...