P0649 Code - Speed Control Lamp Control Circuit

What Does P0649 Mean?

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions. When you see P0649 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0649 ?

• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Faulty IMRC actuator relay (if equipped)
• Some aftermarket accessories and performance modifications

How do you troubleshoot P0649 ?

• Repairing a P0649 trouble code requires a mechanic to perform the following repairs:
• Replace any damaged or faulty wiring, connectors, or components.
• Replace any blown fuses. The mechanic should also test the system to see what is making the fuses blow in the first place and repair that as well.
• Replace any defective wiring within the CAN Bus harness, though it is sometimes easier to replace a section of defective wiring completely as opposed to replacing individual wires and connectors.
• Replace the speed control lamp bulb if blown. If the speed control lamp circuit is at fault, replace that component.
• The mechanic should perform an inspection to ensure that all engine and transmission ground cables, straps, and wires are properly connected.

Searches related to P0649 Code - Speed Control Lamp Control Circuit

• P0649
• P0650