P2648 Fault Code

A Rocker Arm Actuator Control Circuit Low Bank 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2648 fault code indicates an issue with the rocker arm actuator control circuit, specifically for Bank 1. This code suggests that the control circuit voltage is lower than expected, which can affect the timing and operation of the variable valve timing system. If not addressed, this issue can lead to poor engine performance and reduced fuel efficiency.

What are the symptoms of the P2648 code?

When the P2648 code is present, you may experience:

• Engine misfires or rough idling
• Reduced power and acceleration
• Decreased fuel efficiency
• An illuminated check engine light on the dashboard
• Unusual engine noises from the valve train area.

What causes the P2648 code?

The root causes of the P2648 code can vary and may include:

• A defective rocker arm actuator
• Damaged wiring or connectors in the control circuit
• A faulty engine control module (ECM)
• Low oil pressure affecting the actuator's operation
• Contaminated oil impacting the actuator's functionality.

How to fix P2648?

To resolve the P2648 code, the following steps should be taken:

1. Inspect the rocker arm actuator and its connections for any visible damage or disconnections.
2. Check the wiring for signs of wear, corrosion, or short circuits.
3. Test the actuator's resistance and voltage to ensure it is operating correctly.
4. If necessary, replace the faulty rocker arm actuator or repair any damaged wiring.
5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.