What it means
The control module monitors the electrical input from the cruise-control multifunction switch B and checks whether its signal is within the expected range for the switch position. It sets this code when the input is present but its value or behavior falls outside the expected range.
At a glance
- Usually lights the check-engine light
How it works
The cruise-control module checks the electrical signal from multifunction switch input B against the expected value for each switch position. This code sets when the signal is present but its value or behavior falls outside the expected range or performance.
Common causes
Most likely first.
- Faulty cruise-control switch or stalk
- Resistor or signal drift in the switch
- Damaged or corroded wiring or connectors
- Poor electrical connection
Symptoms
- Cruise-control buttons may respond inconsistently
- Cruise control may be unavailable or disengage
- Check-engine light
How to diagnose it
- Record freeze-frame data and watch input B live data while operating and releasing each cruise-control switch position.
- Inspect the switch or stalk for wear, poor movement, or a control that does not consistently return to its rest position.
- Check the switch connector and input B wiring for corrosion, loose terminals, chafing, or intermittent contact.
- Test the switch signal and circuit continuity using the wiring diagram and the manufacturer's specifications, paying attention to changes between positions.
- If the switch and wiring pass, check the cruise-control module connector and input interpretation before considering module replacement.
Common fixes
- Clean and secure a loose or corroded switch connector.
- Repair intermittent or damaged wiring in the input B circuit.
- Replace a switch or stalk whose signal drifts or falls outside the manufacturer's specification.
- Repair or replace the cruise-control module if its input processing is confirmed faulty.
Can I keep driving?
You can usually drive with cruise control disabled, but avoid relying on it while its commands are inconsistent. Control speed manually, particularly in traffic or on hilly roads.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.