Fix P3497: Mechanic’s solutions that WORKED

The code P3497: “VPS Stuck Off Bank 2” indicates a malfunction in the Variable Cylinder Management (VCM) system, specifically related to the deactivation of cylinders on the second bank of the engine. This issue is typically caused by problems within the VCM system, such as a faulty oil pressure switch, inadequate engine oil, or electrical issues.

P3497 quick overview

Meaning	P3497: “VPS Stuck Off Bank 2”
Is it serious?	Yes, it can impact the engine’s performance and fuel economy.
Possible causes	– Faulty Variable Cylinder Management (VCM) system – Malfunctioning oil pressure switch – Inadequate engine oil level or quality – Defective VCM solenoids – Electrical issues in the VCM circuit – Problems with the Powertrain Control Module (PCM)
How to diagnose?	1. Review any Technical Service Bulletins (TSBs) related to P3497. 2. Verify the engine oil level and quality, replacing if necessary. 3. Inspect and test the oil pressure switch, replacing if defective. 4. Check the wiring and connectors for damage or corrosion. 5. Evaluate the VCM solenoids for proper function. 6. If necessary, seek professional assistance for PCM diagnosis.
What is VPS?	VPS (Variable Cylinder Management or Variable Cylinder System) is a technology that improves fuel efficiency by deactivating some of the engine’s cylinders when full power isn’t needed and reactivating them when more power is required.

In simple terms, the P3497 code means that part of the system that helps your car save fuel by turning off some engine cylinders when they’re not needed isn’t working correctly. This could be due to a sensor problem, not enough or dirty engine oil, or an electrical issue. It’s important to get this checked out because it can affect how your car runs and uses fuel.

How to fix P3497 – learn from mechanics

I looked into P3497 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Honda

Vehicle Information 2008 Honda Odyssey Touring 3.5L

Issue + Repair History

• MIL with codes P3497 and P3400 indicating cylinder deactivation system problems
• Replaced bank 2 cylinder deactivation solenoid unit
• Replaced bank 1 oil switch and both solenoids on deactivation unit
• Code P3400 returned after each repair

Other OBD2 Codes + Test Results

• No additional codes or test results mentioned

What Are People Suggesting to Fix Issue

• Check oil pressure
• Replace VVT solenoids
• Check oil pressure at the switch and follow specific steps for testing
• Reflash the PCM
• Use OEM parts instead of aftermarket
• Check the oil level and change oil with a reliable filter
• Check for vacuum leaks with a smoke test
• Replace the oil pressure switch with an OEM part
• Replace the spool valve assembly
• Check oil pressure manually or via data PID
• Inspect cams for damage and consider internal clearance issues

What Was the Final Fix

• The vehicle was not fixed; the owner needed it back. The technician changed the oil with a reliable filter and switched pressure switches, but only code P3400 for the rear bank persisted. The car may be brought back for further inspection.

Case #2: Dodge

ňVehicle Information 2006 Dodge Durango SLT 5.7L

Issue + Repair History

• MIL with code P3497 indicating MDS Rationality Bank 2
• MDS solenoid actuation test performed, all solenoids activated
• Code cleared, reappeared after test drive with mechanical rattle from engine

What Are People Suggesting to Fix Issue

• Ensure the use of 5W20 or 0W20 synthetic oil
• Check for restricted or low oil pressure
• Inspect for sticking MDS lifter
• Look at freeze frame data for clues
• Check for rodent nests under the intake chewing the wires
• Ensure the engine is clean and free of sludge
• Use only 5W20 oil and change oil at 4000 miles max
• Check for MDS solenoid wiring/harness chaffing

What Was the Final Fix

No further issues reported after the oil change

Advised the customer to use synthetic 5W20 or 0W20 oil

Case #3: Honda

Vehicle Information 2010 Honda Odyssey EX-L 3.5L

Issue + Repair History

• Poor Idle Quality, Misfire, MIL with code P3497 (VPS fault)
• Recent repairs: timing belt service, valve cover gaskets, front spool valve gasket, oil service, transmission cooler lines and hoses
• Issue arose shortly after repairs (about 40 miles)
• Swapped pressure sensors and spool valves without resolution
• Oil pressure tests and electrical tests conducted

What Are People Suggesting to Fix Issue

• Avoid Dorman parts, use OEM Honda parts
• Replace both front and rear oil pressure switches
• Check oil pressure when fully hot
• Replace the spool valve assembly with OEM parts
• Ensure no sludge behind the oil filter housing

What Was the Final Fix

• Replaced the rear switch, the front spool valve and switch assembly (excluding the lower housing), oil and filter with all Honda parts
• Cleared codes and conducted a 100-mile road test with no issues or check engine lights
• Emphasized the importance of using OEM Honda parts for these repairs

Computer Codes & Descriptions

• P3497: VPS fault

Additional Insights

• Valve adjustment is unlikely to cause these codes
• Aftermarket parts, especially Dorman, are discouraged due to potential quality issues
• TSB 20-023 may provide relevant guidance
• Ensure proper torque and no use of sealers (RTV) when replacing parts
• Sludge behind the oil filter housing can be a common issue and should be cleaned if present

Case #4: Honda

Vehicle Information 2008 Honda Odyssey EX-L 3.5L

Issue

• MIL with code P3400 (VPS off bank 1)
• Code returns as temporary as soon as the engine starts and sets as permanent after 2-3 miles
• ECO light fluctuates until code sets permanently
• Solenoids do not respond when activated with a scan tool
• Bench testing of solenoids shows movement
• Voltage at the control side of the solenoid harness is 3.3 volts during scan tool test
• Unplugging solenoids causes rough running, plugging in smoothens it

What Are People Suggesting to Fix Issue

• Replace the oil pressure switch for the VCM
• Refer to TSB for “MIL COMES ON WITH DTC P3400 AND/OR P3497”
• Ensure clean and full Honda oil and oil filter
• Check oil pressure switches and wiring
• Update software as per Honda TSB for oil consumption

What Was the Final Fix

• Replaced the oil pressure switch as per TSB information
• Ensured access to current information and TSBs for future repairs

Computer Codes & Descriptions

• P3400: VPS off bank 1

Additional Insights

• The front and/or rear rocker arm oil pressure switch may fail intermittently
• Verify oil quality and level
• Oil pressure switches should read ON with 35 to 50 PSI of oil pressure
• Cylinder deactivation solenoids are 12v feed duty cycled; best to use a scope for patterns
• Both oil pressure switches should be changed and software updated as per TSB for oil consumption issues

Common Advice	Diagnostic Step Description
Replace Oil Pressure Switch	The oil pressure switch for the VCM is often the culprit and should be replaced as a first step.
Refer to TSBs	Check for Technical Service Bulletins (TSBs) related to the DTC P3400 and/or P3497 for guidance on repairs.
Verify Oil Quality and Level	Ensure the engine oil is clean, of good quality, and at the correct level, as the system relies on oil pressure.
Check Oil Pressure Switches and Wiring	Inspect the oil pressure switches and their wiring for proper operation and connectivity.
Update Software	Update the vehicle’s software as per Honda’s TSBs, especially if there are known issues with oil consumption.
Use OEM Parts	Preferably use original equipment manufacturer (OEM) parts for replacements to avoid compatibility issues.