What Does P0649 Mean?
The speed control (cruise control) indicator lamp circuit has a malfunction. The ECM or body control module has detected that the circuit controlling the cruise control warning/status light on the dashboard is not functioning correctly. The driver may notice the cruise control light not turning on when cruise is engaged, or staying on continuously regardless of cruise control status.
Common Causes
30%
Burned-out bulb or failed LED in the instrument cluster for the cruise control indicator
25%
Open or shorted wiring between the cruise control module and instrument cluster
20%
Faulty cruise control module or speed control servo
15%
ECM or BCM internal lamp driver failure
10%
Corroded ground connection for the lamp circuit
Diagnostic Steps
1
Review freeze frame data and check for additional cruise control codes (P0565-P0575). Note whether cruise control actually functions or is completely inoperative.
2
At the instrument cluster connector, back-probe the cruise control lamp circuit wire. Activate cruise control and verify the ECM/BCM is sending the lamp command signal (typically a ground-side switch).
3
If no signal is present at the cluster connector, trace the wire back to the ECM/BCM. Check for continuity through the entire circuit, including any inline connectors or splices.
4
Test the instrument cluster lamp directly by applying appropriate voltage/ground to the cruise lamp pin. If the lamp does not respond, the cluster needs repair.
5
If wiring and lamp are good, use a bidirectional scan tool to command the cruise control lamp on/off. If the ECM cannot toggle the lamp, the ECM output driver may be faulty.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The speed control (cruise control) indicator lamp circuit has a malfunction. The ECM or body control module has detected that the circuit controlling the cruise control warning/status light on the dashboard is not functioning correctly. The driver may notice the cruise control light not turning on w...
The most common cause of P0649 (Speed Control Lamp Control Circuit) is: Burned-out bulb or failed LED in the instrument cluster for the cruise control indicator
Typical repair costs for P0649 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. This code only affects the cruise control indicator lamp, not the cruise control function itself. However, if cruise control is also inoperative, have it checked to ensure the system is not unexpectedly engaging or failing to disengage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0649 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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