P071E
Transmission Mode Switch B Circuit Low
Automatic transmission
Generic OBD-II
High
What it means
P071E means the control module detected low voltage (a short to ground) on the "B" circuit of the transmission mode switch — the switch that selects driving modes such as normal, sport, or tow/haul. A fault here affects mode selection rather than core shifting, so the transmission usually falls back to its default mode.
High
Can I keep driving? Driveable — this affects the drive-mode selector (e.g. normal/sport/tow), not core shifting; the transmission typically defaults to its normal mode.
Common symptoms
What you'll notice
- Check-engine light on
- Drive-mode selector not responding or stuck in the default mode
- No change in shift behavior when switching modes
Common causes
Most likely first
- Short to ground (low voltage) in the mode switch B circuitLikely
- Faulty transmission mode switchCommon
- Corroded or loose connector at the switchCommon
- Faulty transmission/powertrain control moduleLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the fault.
- Visually inspect the mode switch for corrosion or liquid intrusion.
- Inspect the switch B circuit wiring and connector for a short to ground.
- Test the switch operation and signal across each mode position.
- Replace the switch if faulty, clear the code, and re-test.
FAQ
Quick answers
Is it safe to drive with P071E?+
Yes. It affects the selectable drive mode, not the transmission's core operation. It will generally run in its default mode.
Can I just clear P071E?+
It returns until the switch or its wiring is repaired. Clearing won't restore mode selection.
Related codes
Often seen with P071E
Read & clear P071E 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