P2666 Fault Code

Fuel Shutoff Valve B Control Circuit Low

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

The P2666 fault code indicates a problem with the Fuel Shutoff Valve B Control Circuit being too low. This can lead to issues with fuel delivery, affecting engine performance and efficiency. Checking and repairing this circuit is crucial for the proper functioning of the engine and to avoid potential damage.

What are the symptoms of the P2666 code?

Common symptoms associated with a P2666 code include:

• Engine may not start or has difficulty starting
• Poor engine performance, such as reduced power or hesitation
• Stalling or rough idling
• Frequent engine misfires
• Dashboard engine light illuminated

What causes the P2666 code?

Several factors can trigger this fault code, including:

• Faulty wiring or connectors in the fuel shutoff valve circuit
• A malfunctioning fuel shutoff valve itself
• Issues with the Engine Control Module (ECM) not sending the correct signals
• Short circuits or open circuits in the control circuit
• Poor ground connections

How to fix P2666?

To resolve the P2666 error, take these steps:

• Inspect the wiring and connectors for the fuel shutoff valve for damage or corrosion
• Test the fuel shutoff valve to ensure it operates correctly; replace if defective
• Check the ECM for proper operation and update if necessary
• Repair any shorts or open circuits in the control circuit
• Clear the fault code and test drive the vehicle to see if it reoccurs