P0751 Fault Code in Nissan: Causes, Symptoms, and Fixes

Diagnostic Trouble Code (DTC) P0751 indicates that Shift Solenoid “A” is not performing as expected—specifically, it’s stuck in the OFF position or not responding properly when commanded by the Transmission Control Module (TCM). This solenoid controls fluid flow for gear shifting in an automatic transmission. Being stuck “OFF” can cause the transmission to remain in the wrong gear or shift harshly.

Common Causes:

1. Faulty shift solenoid “A”
2. Solenoid stuck due to debris or varnish
3. Dirty or low transmission fluid
4. Damaged wiring or connectors in solenoid circuit
5. Faulty TCM
6. Internal transmission failure (valve body, clutches)

Common Symptoms:

1. Harsh or delayed gear shifts
2. Transmission slipping
3. Stuck in limp mode or fails to upshift/downshift
4. Poor fuel efficiency
5. Check Engine Light (CEL) illuminated

How to Diagnose & Fix:

1. Check Transmission Fluid:
2. Inspect Wiring & Connectors:
3. Test Solenoid:
4. Replace Solenoid A:
5. Flush Transmission Fluid:
6. Check TCM:

Affected Vehicles:

This is a generic OBD-II code, seen in many automatic vehicles, including:
1. Toyota / Lexus
2. Honda / Acura
3. Nissan
4. Ford
5. GM (Chevy, GMC)
6. Hyundai / Kia