P071B

Transmission Mode Switch A Circuit Low

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–89 (est.)

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

P071A P071C P0705