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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.

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