Fault code P0750 – a step-by-step guide to diagnosing and fixing it

Error code P0750 is displayed and the check engine light is on - what does this mean?

The DTC P0750 is recognized by the OBD system if there is a problem with the shift solenoid A of the automatic transmission. This error code indicates a fault in the electrical circuit of the shift solenoid A, which is responsible for the gear shift. This code can be interpreted slightly differently by different manufacturers, but always refers to the first shift solenoid valve.

What causes can this error code have?

• Defective shift solenoid valve A
• Damaged wiring to the solenoid valve
• Corroded or loose plug connections
• Defective transmission control unit (TCM)
• Low transmission oil level
• Contaminated or burnt transmission oil
• Internal transmission damage
• Clogged transmission oil filter
• Defective fuse in the transmission circuit

What symptoms occur in parallel with fault code P0750?

• Shifting problems: The automatic transmission shifts jerkily or gets stuck in a gear
• Emergency running program: The transmission switches to limp mode and only uses a few gears
• Starting problems: The vehicle may not be able to be shifted out of park
• Increased fuel consumption: Fuel consumption increases significantly due to inefficient gear changes
• Unusual noises: Rattling or grinding from the transmission area
• Delayed response: The transmission reacts sluggishly to accelerator pedal changes

How can the problem with error code P0750 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Replacement of the defective shift solenoid valve A after removing the transmission oil pan and locating the corresponding valve
• Repair or replace damaged cables between the transmission control unit and solenoid valve, including insulation and plug connections
• Cleaning corroded plug connections with contact spray and ensuring tight connections
• Transmission oil change with filter change if the oil is contaminated or burnt in accordance with the manufacturer's specifications
• Replacing the transmission control unit if the TCM is defective following professional diagnosis
• Filling the transmission oil to the correct level after checking for leaks
• Replacing blown fuses in the transmission circuit and checking the cause
• Professional transmission repair for internal damage by a specialist workshop