Skip the auto shop - Our mechanics make house calls

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
Icon-warranty_badge-02

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.

GET A QUOTE

More related articles

P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...


Related questions

Q: Code is P02990 what does it mean?

Hello, thanks for writing in about your Buick Cascada. Trouble code P0990 is a transmission fluid pressure fault. Possibly an internal fault in the transmission or there is a fluid leak. If the car didn't make it home, I suggest...

Q: Check engine light came on, car drives normally ?

Hi There, Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad...

Q: I scanned my mercedes ML 250 CDI 4Matic W166 with icarsoft MB 2 scanner. Its showing trouble code U144f00. What does it mean ?

The fault being reported is within a Controller Area Network (CAN) function (wiring or device) but the code itself is generic. According to MB, the particular scanner that you are using will have an accompanying description of the code as...