AutoCodes – Generic – P0649

P0649 Code - Speed Control Lamp Control Circuit

Quick Answer

The Engine Control Module (ECM) monitors the Speed Control Lamp Control Circuit. Common causes include Faulty Speed Control Lamp, Speed Control Lamp harness is open or shorted, Speed Control Lamp circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0649 indicates Speed Control Lamp Control Circuit.
Common causes: Common causes include Faulty Speed Control Lamp, Speed Control Lamp harness is open or shorted, Speed Control Lamp circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 8,794

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0649 Description

The Engine Control Module (ECM) monitors the Speed Control Lamp Control Circuit. The ECM sets the OBDII code when the Speed Control Lamp Control Circuit is not to factory specifications.

OBDII Code P0649 - Speed Control Lamp Control Circuit - AutoCodes.com — P0649 Code - Speed Control Lamp Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0649?

Faulty Speed Control Lamp
Speed Control Lamp harness is open or shorted
Speed Control Lamp circuit poor electrical connection

How to Fix the DTC P0649?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0649 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0649 code?

Need more information on how to fix the P0649 code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0649 Code

1. What are the common symptoms of OBDII code P0649 (Speed Control Lamp Control Circuit)?

- The common symptoms include the speed control system malfunctioning, the speed control light not illuminating, and potential issues with the cruise control system.

2. What are the possible causes of OBDII code P0649?

- Possible causes of this code include a faulty speed control switch, damaged wiring or connectors in the speed control lamp circuit, or a malfunctioning speed control module.

3. How does a malfunction in the speed control lamp control circuit affect vehicle performance?

- A malfunction in the speed control lamp control circuit may not directly impact the drivability of the vehicle, but it can affect the functionality of the cruise control system and may lead to the speed control light not working properly.

4. How can I diagnose OBDII code P0649 at home?

- To diagnose this code, you can start by checking the speed control switch and its wiring for any visible damage. Using a multimeter to test the continuity of the circuit can also help pinpoint the issue.

5. Can I still drive my vehicle with OBDII code P0649 present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent any potential problems with the cruise control system.

6. What are some repair tips for fixing OBDII code P0649?

- Repair tips may include inspecting and repairing any damaged wiring or connectors in the speed control lamp circuit, replacing a faulty speed control switch, or addressing any issues with the speed control module.

7. How much does it typically cost to repair OBDII code P0649?

- The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates in your area, and whether you choose to do the repairs yourself or take your vehicle to a mechanic.

8. Is OBDII code P0649 a common issue in certain vehicle makes and models?

- This code can occur in various vehicle makes and models that are equipped with a speed control system, but it may be more common in vehicles with older or worn-out components.

9. Can resetting the OBDII system clear the P0649 code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain period.

10. How urgent is it to address OBDII code P0649 once it appears?

- While it may not be an emergency, it is recommended to address the issue in a timely manner to prevent potential problems with the cruise control system and ensure the proper functioning of the speed control lamp.