OBD-II Hybrid Error Code P3425: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P3425
Brand
OBD-II Hybrid
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P3425 indicates a problem with the cylinder 9 deactivation actuator in your hybrid vehicle. This actuator controls cylinder deactivation to improve fuel economy, and a fault can cause rough idling, reduced power, or a check engine light. Most fixes involve wiring, solenoid replacement, or software updates.
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Tools You'll Need

How to Fix Error Code P3425

  1. Check Wiring and Connectors

    Disconnect the hybrid battery service plug and wait 10 minutes for high-voltage discharge before working on any actuator wiring.

  2. Test Actuator Solenoid Resistance

  3. Replace Cylinder Deactivation Actuator

    Ensure engine is cool and oil is drained if actuator is near oil passages.

  4. Clear Code and Test Drive

  5. Check Engine Control Module (ECM) Software

    ECM reprogramming requires professional tools and knowledge; do not attempt unless trained.

Parts You May Need

Cylinder deactivation actuator solenoid
Check Price on Amazon
O-ring for actuator
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Cylinder deactivation actuator solenoid
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O-ring for actuator
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Cylinder deactivation actuator solenoid
Check Price on Amazon
O-ring for actuator
Check Price on Amazon
Cylinder deactivation actuator solenoid
Check Price on Amazon
O-ring for actuator
Check Price on Amazon
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When to Call a Professional

If the wiring is damaged in inaccessible areas, the ECM needs reprogramming, or the code persists after replacing the actuator, take the vehicle to a certified hybrid mechanic.

Frequently Asked Questions

Can I drive with error code P3425?
You can drive short distances, but it may cause reduced fuel economy, rough idling, or potential engine damage. It's best to diagnose and fix promptly.
How much does it cost to fix P3425?
DIY cost for a solenoid is $50-$150. Professional repair including labor and diagnostics can range from $200 to $500.
What tools do I need to fix P3425?
You'll need an OBD-II scanner, multimeter, socket set, torque wrench, and safety equipment. A hybrid service plug disconnect tool may be required.
Will a bad battery cause P3425?
Unlikely. P3425 is specific to the cylinder deactivation actuator. However, a weak 12V battery can cause erratic ECM behavior; check battery voltage first.

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