P0593

Cruise Control Multi-Function Input "B" Circuit High

Severity: Low
Driving: No driving restriction

The cruise control multi-function input "B" is reading high - typically shorted to voltage or an open circuit.

Possible causes

CommonFailed cruise control switch or stalk
CommonWiring fault in the steering column or console
CommonDamaged clock spring, on steering-wheel-mounted controls
CommonCorroded or disturbed connector
PossibleBrake or clutch switch fault preventing cruise from engaging
RareFailed control module input

What you might notice

Cruise control will not engage
Cruise control cancelling on its own
Set, resume or cancel not responding
Cruise warning message
Check engine light on

What to check, in order

Watch the cruise control switch states on the live data screen while operating each control.
Check the brake and clutch switches. Cruise control will not engage while the module thinks the brake is pressed, so a brake switch fault presents as a cruise control fault.
On steering-wheel controls, suspect the clock spring - horn or airbag faults alongside confirm it.
Inspect the connector if the column or console has been worked on.
Confirm ordinary driving is unaffected, in which case this can wait.

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

Vehicle speed control, idle control and auxiliary inputs