Error code P0746 is displayed and the check engine light is on - what does this mean?
The OBD/EOBD system has detected that there is a problem with the solenoid valve for the pressure control of the automatic transmission. This DTC P0746 refers specifically to a fault in the pressure control valve solenoid A of the transmission. For various manufacturers, this trouble code can also be referred to as "Pressure Control Solenoid A Performance".
What causes can this error code have?
- Defective pressure control solenoid valve A
- Damaged or corroded wiring to the solenoid valve
- Loose or dirty plug connections
- Blocked hydraulic channels in the transmission housing
- Low or contaminated transmission oil level
- Defective transmission control unit (TCM)
- Mechanical damage to the valve body
- Electrical short circuits or interruptions
What symptoms occur in parallel with fault code P0746?
- Shifting problems: The transmission shifts jerkily or with a delay between gears
- Transmission in emergency mode: The vehicle gets "stuck" in a gear and no longer shifts
- Increased fuel consumption: Fuel consumption increases significantly due to inefficient gear changes
- Vibrations: Noticeable vibrations while driving, especially when accelerating
- Overheating: The transmission can overheat and switch to protection mode
- Starting problems: In severe cases, the vehicle can no longer be started
How to fix the problem of fault code P0746?
- Repairing this fault code requires a systematic approach to the transmission technology.
- Change the transmission oil and filter completely, as contaminated oil can block the solenoid valves
- Remove pressure control valve solenoid valve A, clean or replace completely if defective
- Check all electrical connections to the solenoid valve and repair or replace damaged cables
- Clean plug connections, check for corrosion and treat with contact spray
- Remove the valve body and have the hydraulic channels professionally cleaned
- Diagnose transmission control unit and replace or reprogram if defective
- Carry out a complete transmission flush to remove all deposits
FAQ - Frequently asked questions about DTC P0746
Can I continue driving with error code P0746?
Short journeys are possible, but code P0746 can lead to serious damage to the transmission. The vehicle should be taken to a workshop as soon as possible, as the transmission is operating in emergency mode and can overheat.
How much does it cost to repair error code P0746?
The costs vary between 150-800 euros depending on the cause. A simple oil change costs around 150-250 euros, while replacing the solenoid valve can cost 300-500 euros and a valve body repair can cost up to 800 euros.
How can I delete error code P0746 myself?
The DTC P0746 can be deleted with an OBD scanner, but will return if the cause has not been rectified. Permanent deletion requires the underlying problem on the transmission to be repaired.
Is the error code P0746 manufacturer-specific?
No, P0746 is a standardized EOBD code that has the same meaning for all manufacturers. However, the specific repair procedures and solenoid valve positions may vary depending on the vehicle model.
Can bad transmission fluid cause code P0746?
Yes, old or contaminated transmission fluid is a common cause of this trouble code. Deposits can block the solenoid valves and lead to malfunctions in the hydraulic system.
How long does it take to repair error code P0746?
Depending on the cause, the repair takes 2-8 hours. A simple oil change takes around 2 hours, while removing the valve body can take an entire working day.
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