P0649

Speed Control Lamp Control Circuit

Severity: Low
Driving: Drivable — book it in

A fault in the control circuit for the cruise control lamp - the lamp that shows when cruise control is active. The system behind it may be working perfectly; what has failed is the indication. That still matters, because a warning lamp that cannot light is a warning you will not get.

Possible causes

CommonBlown indicator bulb
CommonWiring or connector fault between the module and the cluster
PossibleFailed instrument cluster lamp driver
PossibleCorroded connector behind the cluster
RareFailed control module output driver

What you might notice

The lamp not lighting when it should
The lamp permanently on
Check engine light on
The system itself working normally

What to check, in order

Check whether the lamp lights during the ignition-on bulb check. If it never lights there, start with the bulb or the cluster.
Confirm the system behind the lamp still works, so you know whether this is only an indication fault.
Check the wiring between the module and the cluster.
Do not dismiss this as cosmetic. The engine hot lamp in particular is how you find out about overheating before it becomes expensive.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

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Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication

Computer output circuits and control module