What it means
This code identifies a fault associated with TCS mode control. The specific failure depends on the diagnostic subtype.
How it works
The TCS mode control switch lets the driver select among traction-control modes offered by the vehicle. The control module monitors the mode switch input and sets this subfault when the selected-mode signal is not recognized or fails the subtype-specific check.
Common causes
Most likely first.
- Mode switch fault
Symptoms
- Traction-control warning light
- Selected TCS mode may not work as expected
How to diagnose it
- Read the diagnostic subtype and freeze-frame data, and record which TCS mode is selected and what warning appears.
- Operate each available TCS mode setting and note whether the displayed or reported selection changes reliably.
- Inspect the mode switch for damage or sticking and check its connector and nearby wiring for looseness, corrosion, or chafing.
- Use a scan tool to monitor the TCS mode input while changing settings, checking whether the module sees the same selection as the driver.
- Test the switch and mode-control circuit against the manufacturer's specification before considering a control-module fault.
Common fixes
- Clean and secure the mode switch connector or repair damaged wiring.
- Replace a faulty or sticking TCS mode switch.
- Correct a poor power, ground, or signal connection in the mode-control circuit.
- Repair or replace the control module if circuit checks establish an internal input fault.
Can I keep driving?
The selected traction-control mode may not take effect, and traction control could remain in a default mode or become unavailable. Use cautious throttle on slippery or loose surfaces and do not assume a mode change succeeded based only on pressing the switch.
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.