Cylinder Deactivation System Bank 2 Malfunction
The P3497 code indicates a problem with the cylinder deactivation system on Bank 2 of the engine. This system, also known as Active Fuel Management (AFM) or Displacement on Demand (DoD), shuts down cylinders under light load to improve fuel economy. The code is triggered when the powertrain control module (PCM) detects a malfunction in the deactivation mechanism, such as stuck or faulty solenoids, oil pressure issues, or mechanical binding in the valve lifters. Bank 2 refers to the side of the engine opposite cylinder #1, typically the passenger side on V8 engines.
01. Most Common Causes
- Faulty cylinder deactivation solenoid on Bank 2
- Low engine oil level or pressure
- Clogged oil passages to the deactivation lifters
- Mechanical failure of the deactivation lifters or camshaft
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Reduced fuel economy
- Loss of power or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P3497 is present. Check for additional codes like misfire codes.
Step 2: Inspect engine oil level and condition; low or dirty oil can cause deactivation issues.
Step 3: Use a bidirectional scan tool to command cylinder deactivation on/off and listen for solenoid clicks.
Step 4: Perform a cylinder power balance test to identify which cylinder(s) are not deactivating properly.
Step 5: Visually inspect wiring and connectors to the deactivation solenoids on Bank 2 for damage or corrosion.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the issue can cause engine misfire, reduced performance, and potential damage to the catalytic converter or engine internals.
How much does it cost to fix?▼
Costs vary widely depending on the root cause. Simple fixes like an oil change or solenoid replacement can be $150-$300, while replacing lifters or camshaft can exceed $800.