P0649 Fault Code

Speed Control Lamp Control Circuit

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

The P0649 fault code relates to the Speed Control Lamp Control Circuit, which is an essential component of the vehicle's cruise control system. This code indicates that there is an issue with the electrical circuit that controls the speed control lamp, which is responsible for indicating when cruise control is active. Proper function of this circuit is crucial for the effective operation of the cruise control feature, ensuring both safety and driver convenience.

What are the symptoms of the P0649 code?

Common symptoms associated with the P0649 fault code may include:

• The cruise control feature may not engage or disengage properly
• The speed control lamp on the dashboard may not illuminate when cruise control is activated
• Possible warning lights on the dashboard indicating cruise control issues
• Erratic or unpredictable performance of the cruise control system.

What causes the P0649 code?

Possible causes for the P0649 fault code may include:

• A malfunctioning speed control switch
• A damaged or corroded wiring harness
• Faulty connectors that affect the circuit
• Issues with the vehicle's Engine Control Unit (ECU) that may interfere with signal processing
• A blown fuse associated with the cruise control system.

How to fix P0649?

To resolve the P0649 fault code, consider the following steps:

• Inspect the speed control switch for any signs of malfunction or wear
• Check the wiring harness and connectors for damage or corrosion, and repair or replace as necessary
• Look for blown fuses that may be related to the cruise control circuit and replace them
• If the wiring and components are in good shape, examine the ECU for potential issues, and consider reprogramming or replacing it if necessary.