What it means
The upshift switch (paddle or steering-wheel button on Tiptronic-style controls) signal is implausible. Stuck or noisy contacts.
At a glance
- Usually lights the check-engine light
How it works
The upshift switch, often a paddle or steering-wheel button in manual shift mode, sends a request for a higher gear. The transmission controller monitors whether the switch signal is plausible as the control is operated. This code sets when that signal is outside its expected range or behaves inconsistently, such as from worn or contaminated contacts.
Common causes
Most likely first.
- Contamination on switch contacts
- Worn switch contacts
- Sensor element aged beyond calibration window
Symptoms
- Check engine or transmission warning light may be on
- Upshifts may not respond to the switch
- Manual shift mode may behave unpredictably
How to diagnose it
- Save freeze-frame data and check related transmission codes and available upshift-switch status before clearing the fault.
- With the vehicle safely parked, operate the upshift control and check whether scan-tool switch status changes cleanly each time.
- Inspect the upshift button or paddle and its accessible connectors for contamination, damage, or a loose connection.
- If the control is on the steering wheel, inspect the accessible steering-wheel wiring connectors and look for signal changes while gently moving the harness.
- Test the upshift switch circuit and contacts using the manufacturer’s wiring diagram and specification.
Common fixes
- Clean the upshift switch contacts if contamination is causing erratic operation and cleaning is permitted by the manufacturer.
- Secure a loose connector at the switch or steering-wheel harness.
- Repair damaged wiring in the upshift switch circuit.
- Replace the upshift switch if its contacts fail testing.
Can I keep driving?
If the vehicle shifts normally in automatic mode, you can usually drive gently while avoiding reliance on manual upshift requests. Stop using the switch if it triggers unexpected shifts, and have the circuit checked before driving in conditions where predictable gear selection matters.
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.