P071B
Transmission Mode Switch A Circuit Low
P071B is an OBD-II diagnostic trouble code meaning: Transmission Mode Switch A Circuit Low. Common causes: faulty automatic transmission mode switch, open or short circuit in switch circuit. Estimated repair cost: $17–89.
Symptoms
- The car goes into automatic transmission emergency mode
- Unable to change gears
- There is no indication of the selected mode on the dashboard
- Automatic transmission fault indicator flashes
- The vehicle may not start in 'P' or 'N' position
Causes
- Faulty automatic transmission mode switch
- Open or short circuit in switch circuit
- Poor contact connection or corrosion
- Problems with the relay or circuit fuse
- Transmission ECU malfunction
How to Fix
- Check the condition of fuses and relays
- Inspect switch connections and wiring
- Check the resistance of the mode switch
- Scan the voltage in the switch circuit
- If necessary, replace the automatic transmission mode switch
Related codes
Error P071B by Vehicle Brand
FAQ
What does the P071B code mean?
P071B is an OBD-II diagnostic trouble code that indicates: Transmission Mode Switch A Circuit Low
What causes a P071B error code?
The most common causes of P071B include: Faulty automatic transmission mode switch; Open or short circuit in switch circuit; Poor contact connection or corrosion; Problems with the relay or circuit fuse.
How do I fix a P071B diagnostic trouble code?
To fix P071B: Check the condition of fuses and relays. Inspect switch connections and wiring. Check the resistance of the mode switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P071B?
Do not drive — repair immediately
How much does it cost to fix P071B?
The estimated repair cost for P071B is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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