OBD-II code · Powertrain (generic)
P071F Transmission Mode Switch B Circuit High
Same as P071C on switch B. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P071F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Transmission Mode Switch B
Related codes
- P071CTransmission Mode Switch A Circuit High
- P07CDTransmission Mode Switch C Circuit High
- P07D0Transmission Mode Switch D Circuit High
- P07D3Transmission Mode Switch E Circuit High
- P07D6Transmission Mode Switch F Circuit High
- P071DTransmission Mode Switch B Circuit
- P071ETransmission Mode Switch B Circuit Low
- P0720Output Speed Sensor Circuit Malfunction
- P0721Output Speed Sensor Circuit Range/Performance
- P0722Output Speed Sensor Circuit No Signal
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.