P2663 — Low voltage in rocker arm actuator circuit bank 2

The engine's variable valve timing system on bank 2 is not receiving proper voltage, causing poor control of the rocker arm actuator. This can affect engine performance and efficiency. The code appears when the control module detects a low electrical signal or circuit fault in this actuator's control wiring.

Common causes

The cause is almost always one of a few things. Here they are — P2663 rarely comes from anything outside this list:

• Faulty rocker arm actuator solenoid
• Damaged or corroded wiring/connectors in actuator circuit
• Low battery voltage or charging system issues
• Faulty engine control module (rare)
• Oil contamination or low oil pressure affecting actuator

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and clean wiring connectors for corrosion or damage
2. Test battery and charging system voltage
3. Inspect and replace rocker arm actuator solenoid if faulty
4. Check engine oil level and quality, change if dirty
5. Replace engine control module only if all else fails

That is what holds for P2663 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.