Cylinder Deactivation System Bank 2
This code indicates that the engine control module (ECM) has detected a malfunction in the cylinder deactivation system for engine Bank 2. The code is set when the system fails to properly engage or disengage the cylinders, often due to incorrect oil pressure or a faulty control solenoid.
While the vehicle is usually safe to drive in the short term, prolonged driving with this code can lead to poor fuel economy, rough running, and potential internal engine wear. It should be diagnosed soon to prevent further damage to the valvetrain.
Common symptoms
- Illuminated Check Engine Light
- Noticeable decrease in fuel economy
- Engine runs rough or misfires
- Hesitation or lack of power during acceleration
- Abnormal ticking noises from the engine valvetrain
Likely causes
- Low engine oil level or incorrect oil viscosity
- Dirty or degraded engine oil
- Faulty cylinder deactivation solenoid on Bank 2
- Restricted oil passages in the engine block or cylinder head
- Faulty oil pressure sensor
- Damaged wiring or poor electrical connection to the solenoid
What to check before replacing parts
Check the engine oil level and condition.
Look for: Look for oil that is low, excessively dirty, or of the wrong viscosity, as the deactivation system relies heavily on proper oil pressure.
Scan the ECM for any other related diagnostic trouble codes.
Look for: Look for codes related to low oil pressure, misfires, or variable valve timing, which can help isolate the root cause.
Perform a mechanical engine oil pressure test.
Look for: Look for oil pressure readings that fall below the manufacturer's minimum specifications, indicating a mechanical oil supply issue.
Inspect and test the Bank 2 cylinder deactivation solenoid.
Look for: Look for proper resistance across the solenoid terminals and ensure it clicks when manually energized with a fused jumper wire.
Inspect the wiring harness and connectors for the Bank 2 solenoid.
Look for: Look for frayed wires, corroded pins, or loose connections that could interrupt the signal from the ECM.
This page explains the generic P3497 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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