What it means
The up/down shift switch reports a range/performance fault. Manual shift requests via paddle or selector cannot be reliably interpreted.
At a glance
- Usually lights the check-engine light
How it works
The up and down shift switch, often built into a paddle or selector, sends the driver's manual shift requests to the transmission controls. This code sets when the switch signal is outside its expected range or does not respond consistently enough to interpret the request reliably.
Common causes
Most likely first.
- Switch contacts aged
- High-resistance contact
- Sensor element aged beyond calibration window
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and check for related transmission or switch codes before clearing anything.
- Use live scan-tool data to operate the upshift and downshift controls and see whether each request changes state consistently.
- Inspect the paddle or selector switch and its connector for sticking, wear, looseness, corrosion, or fluid contamination.
- Check the switch wiring for damage or high resistance, especially where it moves with the steering wheel or selector.
- Test the switch signal across its operating range against the manufacturer's specification to distinguish worn contacts from a wiring fault.
Common fixes
- Clean and secure the switch connector.
- Repair damaged or high-resistance wiring in the shift-switch circuit.
- Replace the worn up/down shift switch or paddle assembly if its signal is inconsistent.
- Recalibrate the switch only if the manufacturer's procedure calls for it.
Can I keep driving?
If normal automatic shifting remains predictable, a short cautious trip for diagnosis may be possible, but do not rely on manual paddle or selector requests. Avoid driving if shifts become harsh, delayed, or unpredictable.
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.