P071C
Transmission Mode Switch A Circuit High
Transmission mode switch
Generic OBD-II
High
What it means
P071C means the transmission mode switch — the control that selects driving modes such as normal, sport, economy, or tow — is sending a higher-than-expected signal, usually from an open circuit, a short-to-power, or a bad switch. The car still drives and shifts normally in its default pattern; you just lose the ability to change modes until it's repaired.
High
Can I keep driving? Yes — the car drives normally; you may just lose the sport/economy/tow mode selection until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Sport/economy/tow driving mode won't select or won't change
- Mode indicator light not working correctly
- Transmission stays in its default shift pattern
Common causes
Most likely first
- Faulty transmission mode switchLikely
- Open or short-to-power in the mode switch circuitCommon
- Corroded or loose switch connectorCommon
- Failed TCM/PCM switch inputLess often
How to diagnose & fix
Work through it in order
- Scan and confirm the high-input fault is on the mode switch circuit.
- Operate the mode switch while watching its state on a scan tool.
- Inspect the switch wiring and connector for an open, short-to-power, or corrosion.
- Test or replace the mode switch, then check the PCM connection, clear, and re-test.
FAQ
Quick answers
Is it safe to drive with P071C?+
Yes. This switch only selects driving modes like sport or economy; the transmission still shifts in its default pattern. It's a convenience fault, not a safety one.
Can I just clear P071C?+
It returns if the mode switch or its wiring is still open or shorted high.
Related codes
Often seen with P071C
Read & clear P071C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX