P071FTransmission Mode Switch B Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- A transmission mode switch selects an alternative shift schedule such as sport, winter or tow/haul; J2012 does not define which button is A or B. No manufacturer document available to us uses P071A–P071F: GM monitors its analog drive mode switch under its own codes (low below 21–29 % of 5 V, high from 94 %, 200 of 250 samples, two trips), which shows how such buttons are read as coded voltages. P071F means the signal of mode switch B is above its upper limit – an open circuit or short to positive. Mode B then cannot be selected. The opposite is P071E.
- What you may notice
- Mode B cannot be selected or stays active
- Mode indicator missing or flashing
- Transmission stays on the normal shift schedule
- Likely causes
- LikelyWire or connector to the button open
- PossibleButton open internally
- RareSignal wire shorted to positive
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.