OBD-II Hybrid Error Code P3428: How to Fix It

Q: Can I still drive my car with a P3428 code?

In many cases the vehicle will remain drivable with a P3428 code, but it is not recommended to drive it long-term without addressing the fault. The cylinder deactivation system will likely be disabled by the ECM as a safety measure, reducing fuel economy. If other symptoms appear such as rough idle, misfires, knocking, or oil pressure warning lights, stop driving immediately and have the vehicle inspected.

Q: What causes the P3428 cylinder deactivation actuator fault?

The most common causes are low or dirty engine oil, low oil pressure, a failed or stuck deactivation solenoid actuator, damaged wiring or a corroded connector at the actuator, and in some cases an ECM software issue. Infrequent oil changes are a leading contributor because sludge can clog the small oil passages that operate these actuators.

Q: How much does it cost to fix a P3428 code?

If the fix is simply an oil change, cost is typically $30–$100. A replacement cylinder deactivation actuator solenoid generally costs $50–$200 for the part, with labor adding $100–$400 depending on accessibility and shop rates. If the issue involves wiring repair or ECM reprogramming, costs can rise to $300–$800 or more.

Q: Will a P3428 code cause a failed emissions test?

A stored P3428 code will illuminate the Check Engine Light, which will cause an automatic failure in most OBD2-based emissions inspections. The fault must be properly repaired and the readiness monitors must complete a full drive cycle before the vehicle will pass an emissions test.

Q: Does P3428 only appear on hybrid vehicles?

No. While this guide is framed around hybrid platforms, P3428 is a generic OBD2 code that can appear on any vehicle with a multi-cylinder engine equipped with active fuel management or cylinder deactivation technology, including many conventional gasoline V8, V10, and V12 engines. The diagnosis and repair approach is essentially the same across platforms.

Abstract

Error code P3428 indicates a fault with the Cylinder 10 deactivation actuator in your hybrid vehicle's variable displacement or cylinder deactivation system. This system allows the engine to shut off select cylinders under light load to improve fuel economy, and when the actuator controlling Cylinder 10 fails or receives an unexpected signal, the ECM logs this code. While the vehicle may still be drivable, ignoring this fault can lead to rough running, reduced fuel efficiency, and potential engine damage over time.