P3478
- Powertrain
- Manufacturer-specific
- Emissions
- Safety
Stop driving
Continuing to drive risks injury or major mechanical damage. Shut the engine off when it is safe to do so.
Cylinder Deactivation Oil Pressure Switch Bank 2 Performance
This code is in our catalogue but has not yet been through editorial review, so the guidance below is limited to what our structured data supports. We publish deeper diagnostic content only after a code has been reviewed — here is why.
The engine control module has detected a rationality fault between commanded oil pressure and the bank 2 cylinder deactivation oil pressure switch state. The switch fails to change state at the expected pressure threshold during deactivation transitions on bank 2.
A trouble code records what a control module measured. It does not identify which part failed. Test before replacing anything.
- Safe to drive
- Continuing to drive risks injury or major mechanical damage. Shut the engine off when it is safe to do so.
- Urgency
- Stop driving
- Will it pass emissions
- No
- Check engine light
- Solid
- Clearing the light
- A completed drive cycle is normally required before the monitor re-runs and the light can clear.
| # | Cause | How often | Component |
|---|---|---|---|
| 1 | Pressure switch sticky or contaminated | Very common | — |
| 2 | Oil control valve slow to respond | Common | — |
| 3 | Low system oil pressure | Occasional | — |
Ordering reflects how often each cause is responsible in general, not a probability for your vehicle. Confirm by testing.
- Oil Pressure Switch
- Oil Control Valve
- Definition
- Generic code set (SAE J2012 / ISO 15031-6) via the OBDexopen database, dedicated to the public domain under CC0-1.0.
- Diagnostic guidance
- Written and reviewed in-house. See our editorial policy.
- Review status
- Awaiting review
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