P2646 – Rocker Actuator System Performance ‘A’ / Row 1 Stuck

P2646 Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator ‘A’
Rocker arm actuator ‘A’ circuit is open or shorted
Poor electrical connection in the rocker arm actuator ‘A’ circuit

How to Fix Code P2646

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2646 Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust the engine’s valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets the OBDII code when the rocker arm actuator ‘A’ circuit is outside factory specifications.

P2647 – Rocker Actuator System “A” Stuck on Row 1

P2647 Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator ‘A’
Rocker arm actuator ‘A’ circuit is open or shorted
Poor electrical connection in rocker arm actuator ‘A’ circuit

How to Fix Code P2647

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P2647 Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets the OBDII code when the rocker arm actuator ‘A’ circuit is outside factory specifications.

P2648 – Rocker Actuator ‘A’ Control Circuit, Bank 1 Low

P2648 Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator ‘A’
Rocker arm actuator ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator ‘A’ circuit

How to Fix Code P2648

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2648 Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets the OBDII code when the rocker arm actuator ‘A’ circuit is outside factory specifications.

P2649 – Rocker Actuator Control Circuit High ‘A’, Bank 1

P2649 Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator ‘A’
Rocker arm actuator ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator ‘A’ circuit

How to Fix Code P2649

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2649 Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets the OBDII code when the rocker arm actuator ‘A’ circuit is outside factory specifications.

P264A – Rocker Actuator Position Sensor Circuit ‘A’, Bank 1

P264A Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator sensor ‘A’
Rocker arm actuator sensor ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator sensor ‘A’ circuit

How to Fix Code P264A

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P264A Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets the OBDII code when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.

P264B – Rocker Actuator “A” Position Sensor Circuit Range/Performance, Bank 1

P264B Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator sensor ‘A’
Rocker arm actuator sensor ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator sensor ‘A’ circuit

How to Fix Code P264B

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P264B Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets the OBDII code when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.

P264C – Actuator Rocker Position Sensor Circuit ‘A’, Bank 1

P264C Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator sensor ‘A’
Rocker arm actuator sensor ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator sensor ‘A’ circuit

How to Fix Code P264C

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P264C Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets the OBDII code when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.

P264D – Actuator Rocker Arm ‘A’ Position Sensor Circuit, Bank 1

P264D Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator sensor ‘A’
Rocker arm actuator sensor ‘A’ circuit open or shorted
Poor electrical connection in rocker arm actuator sensor ‘A’ circuit

How to Fix Code P264D

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P264D Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets the OBDII code when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.

P264E – Rocker Arm Actuator Control Circuit ‘A’, Intermittent/Erratic, Bank 1

P264E Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator sensor ‘A’
Open or short circuit in rocker arm actuator sensor ‘A’ harness
Poor electrical connection in rocker arm actuator sensor ‘A’ circuit

How to Fix Code P264E

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P264E Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets the OBDII code when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.

P2650 – Actuator ‘B’ Rocker Control Circuit / Bank Open 1

P2650 Possible Causes

Low or overfilled engine oil
Incorrect engine oil type
Faulty rocker arm actuator “B”
Rocker arm actuator “B” circuit open or shorted
Poor electrical connection in rocker arm actuator “B” circuit

How to Fix Code P2650

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2650 Meaning

The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the Variable Valve Timing system to adjust engine valve timing. The Variable Valve Timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator circuit and sets the OBDII code when the rocker arm actuator “B” circuit is outside factory specifications.