Powertrain, generic · Transmission
P071F Transmission Mode Switch B Circuit High
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
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.
Likely causes
Wire or connector to the button open
Button open internally
Signal wire shorted to positive
Symptoms
- Mode B cannot be selected or stays active
- Mode indicator missing or flashing
- Transmission stays on the normal shift schedule
Repair estimate
DifficultyEasyDIY possible
Parts and labour€30–300
Time0.3–1.5 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
transmission mode switchswitch wiringtransmission control module
Related codes
References: law.cornell.edu, gsi.ext.gm.com.