P2649 code definition
‘A’ Rocker Arm Actuator Control Circuit High Bank 1
What the P2649 code mean
P2649 is an OBD-II code for the engine control module (ECM) detecting the ‘A’ rocker arm actuator control circuit for bank 1 has voltage is high. This indicates a short to power in the actuator circuit.
What causes the P2649 code?
The ECM detects a short circuit signal from the 'A' rocker arm actuator and sets the code in memory. The engine light will then be turned on.
The connection to the actuator or the actuator has an short circuit.
What are the symptoms of the P2649 code?
The engine may run erratic or power will be affected.
The engine may lose power.
The engine may not run smooth when the two banks of the engine are in different valve positions.
The Check Engine Light will be illuminated.
How does a mechanic diagnose the P2649 code?
Scans for codes and documents the code in the ECM, and then views the freeze frame data for the code.
Checks the wiring and connector to the actuator to make sure it is okay.
Performs the manufacture pinpoint test on the ‘A’ rocker arm actuator to verify if the failed actuator or wiring is shorted to power.
Common mistakes when diagnosing the P2649 code
Replacing the actuator without verifying the actuator is shorted or the circuit is shorted
Failing to clear the ECM codes after the system is repaired
Replacing parts when the wiring is shorted to power on the return circuit to ECM
How serious is the P2649 code?
Code P2649 is a code for the 'A' rocker arm control circuit, and will cause the engine to run erratic and have power loss issues.
What repairs can fix the P2649 code?
- Replacing the 'A' rocker arm actuator
- Repairing the wiring harness or connector to the actuator
- Following the manufacture pinpoint test to isolate faults in the system
Additional comments for consideration regarding the P2649 code
Code P2649 is not a very common code since most vehicles do not have actuators for the rocker arms of the engines they manufacture. The actuators are the most common failure that causes the short in the circuit causing the code.
Need help with a P2649 code?
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