P0649Speed Control Lamp Control Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- The engine module switches this hard-wired output with its own driver and checks the circuit electrically (open, short to ground or voltage) – it cannot see whether the lamp lights; on CAN-based cars such faults appear as U codes. P0649 concerns the cruise control ('speed control') indicator where the engine module drives it by wire. No manufacturer document available to us uses this code; the description follows CARB and the component. CARB names cruise control as an example of a function outside the test cycles, and GM rates its cruise control diagnostics as emission neutral without the check engine light. The indicator then does not work or stays on; whether cruise control is also disabled depends on the maker. Cruise control inputs and switches have their own codes (P0564–P0581).
- What you may notice
- Cruise control indicator not working or stays on
- Cruise control possibly disabled (depending on the maker)
- Code stored
- Likely causes
- LikelyWire or connector between module and receiver open, corroded or shorted
- PossibleBulb/LED or instrument cluster faulty
- PossibleInstrument cluster faulty
- RareOutput driver in the module faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.