BMW DTC P0777 – Pressure Control Solenoid ‘B’ Stuck On
DTC P0777 meaning on BMW
DTC P0777 indicates an issue with the Pressure Control Solenoid ‘B’ in the transmission of a BMW vehicle. This code specifically points to the solenoid being stuck in the on position, which can lead to improper pressure control within the transmission system.
BMW DTC P0777 symptoms
Symptoms of DTC P0777 in a BMW may include harsh shifting, delayed engagement when shifting gears, transmission slipping, decreased fuel efficiency, and in some cases, the transmission may go into a fail-safe or limp mode.
BMW DTC P0777 causes
The common causes of DTC P0777 in a BMW include a faulty pressure control solenoid ‘B’, wiring issues, low transmission fluid level, dirty or contaminated transmission fluid, or internal transmission problems.
BMW DTC P0777 seriousness
Ignoring DTC P0777 in a BMW can lead to further damage to the transmission system, potentially resulting in costly repairs. It is important to address this issue promptly to prevent any long-term damage to the vehicle.
How to diagnose DTC P0777 on BMW
To diagnose DTC P0777 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes from the vehicle’s computer system. They would then perform a visual inspection of the transmission components, check the wiring harness for any damage, and test the pressure control solenoid ‘B’ for proper operation.
How to fix DTC P0777 on BMW
Fixing DTC P0777 on a BMW may involve replacing the pressure control solenoid ‘B’, repairing any damaged wiring, ensuring the transmission fluid is at the correct level and in good condition, and addressing any other underlying issues that may have caused the fault code.
How to erase DTC P0777 on BMW
Once the underlying issue causing DTC P0777 has been fixed, the fault code can be cleared using a diagnostic scanner. This will reset the vehicle’s computer system and turn off the check engine light. It is important to ensure that the repair has been successful before clearing the fault code.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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