Fault code P1745 – a step-by-step guide to diagnosing and fixing it

Error code P1745 is displayed and the check engine light is on - what does this mean?

The DTC P1745 is a manufacturer-specific fault code that is recognized by the OBD system and indicates problems with the transmission control unit. This trouble code typically refers to malfunctions in the electronic pressure control system of the automatic transmission. This fault code can have different meanings for different manufacturers, but usually relates to the transmission hydraulics or solenoid valves.

What causes can this fault code have?

• Defective solenoid valve in the transmission control unit
• Contaminated or clogged transmission oil
• Damaged wiring to the transmission control unit
• Loose or corroded plug connections
• Defective transmission oil pressure sensor
• Mechanical problems in the transmission hydraulics
• Faulty transmission control unit (TCM)
• Transmission oil level too low

What symptoms occur in parallel with fault code P1745?

• Shifting problems: The transmission shifts jerkily or with a delay between gears
• Emergency running program: The vehicle gets "stuck" in a gear and no longer shifts
• Loss of power: Reduced engine power and poor acceleration
• Irregular shifting behavior: Unpredictable gear changes or failure to shift gears
• Increased fuel consumption: Due to inefficient transmission control
• Vibrations: Noticeable vibrations while driving or shifting gears

How to fix the problem of error code P1745?

• Repairing the P1745 error code requires a systematic approach to identify the root cause.
• Change the transmission oil and filter completely, as contaminated oil is often the cause of solenoid valve problems
• Check the wiring and plug connections to the transmission control unit for damage, corrosion or loose contacts and repair them
• Replace transmission oil pressure sensor if pressure measurements are out of specification
• Identify and replace defective solenoid valves in the transmission control block
• Reprogram transmission control module (TCM) or replace if irreparably defective
• Clean or overhaul the transmission hydraulic block if there are mechanical blockages