Error code P0771 is displayed and the check engine light is on - what does this mean?
The OBD system detects a fault in the shift solenoid A of the automatic transmission, which is responsible for shifting into reverse and certain forward gears. This DTC P0771 affects the automatic transmission and can occur with different manufacturers, whereby the specific symptoms can vary depending on the vehicle model.
What can cause this fault code?
- Defective shift solenoid A in the automatic transmission
- Dirty or blocked hydraulic channels
- Damaged wiring harness to the shift solenoid
- Loose or corroded plug connections
- Defective transmission control unit (TCM)
- Contaminated or used transmission oil
- Mechanical wear of the shift valves
- Defective pressure sensors in the transmission
- Overheating of the automatic transmission
What symptoms occur in parallel with fault code P0771?
- Shifting problems: The transmission shifts jerkily or with a delay
- Reverse gear does not work: Reverse gear cannot be engaged
- Transmission remains in emergency mode: The vehicle only drives in one gear
- Increased fuel consumption: Due to inefficient gear changes
- Unusual noises: Rattling or knocking when changing gear
- Transmission overheating: Transmission temperature warning light comes on
How can the problem with error code P0771 be rectified?
- The repair usually requires a systematic diagnosis to identify the exact cause.
- Change the transmission oil and filter, as contaminated oil can block the solenoid valves
- Replace shift solenoid A if it is electrically defective or mechanically blocked
- Check and repair the wiring harness and plug connections to the transmission
- Diagnose transmission control unit (TCM) and replace or reprogram if necessary
- Clean the hydraulic block of the transmission or have it overhauled
- Carry out a complete transmission overhaul if several internal components are damaged
FAQ - Frequently asked questions about DTC P0771
Can I continue driving with error code P0771?
Continuing to drive with P0771 is only possible to a limited extent, as the transmission is operating in emergency mode. You should visit a workshop immediately to avoid major damage.
How much does it cost to repair error code P0771?
The repair costs vary between 200-2000 euros, depending on the cause. A simple oil change costs around 200-300 euros, while a transmission overhaul can cost up to 2000 euros.
How can I delete error code P0771 myself?
The code P0771 can be deleted with an OBD scanner, but will return if the problem has not been rectified. Professional diagnosis is recommended.
Is fault code P0771 the same for all manufacturers?
Yes, P0771 is a standardized EOBD code that has the same meaning for all manufacturers - problem with the shift solenoid A of the automatic transmission.
Can bad transmission oil cause fault code P0771?
Yes, contaminated or used transmission oil can block the shift magnets and trigger trouble code P0771. It is therefore important to change the oil regularly.
How long does it take to repair fault code P0771?
The repair time is 2-8 hours, depending on the cause. A simple solenoid valve replacement takes around 2-3 hours, while a transmission overhaul can take several days.