BMW DTC P0779 – Pressure Control Solenoid ‘B’ Intermittent
DTC P0779 meaning on BMW
DTC P0779 indicates an intermittent issue with the Pressure Control Solenoid ‘B’ in the transmission of a BMW vehicle. The Powertrain Control Module (PCM) has detected that the signal from the pressure control solenoid ‘B’ is intermittent or lost, affecting the proper operation of the transmission.
BMW DTC P0779 symptoms
Symptoms of DTC P0779 in a BMW may include erratic shifting, harsh shifting, transmission slipping, delayed engagement when shifting gears, and in some cases, the transmission may go into a limp mode where it operates in a single gear only.
BMW DTC P0779 causes
The common causes of DTC P0779 in a BMW include a faulty pressure control solenoid ‘B’, wiring issues such as loose connections or damaged wiring harness, low transmission fluid level or dirty transmission fluid, or a malfunctioning PCM.
BMW DTC P0779 seriousness
Ignoring DTC P0779 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 P0779 on BMW
To diagnose DTC P0779 on a BMW, a mechanic would typically start by using a scan tool to retrieve the fault codes from the PCM. They would then inspect the pressure control solenoid ‘B’ and its wiring for any visible damage. Testing the solenoid’s resistance and checking the transmission fluid level and condition are also common diagnostic steps.
How to fix DTC P0779 on BMW
Fixing DTC P0779 on a BMW usually involves replacing the faulty pressure control solenoid ‘B’ and addressing any wiring issues if present. Additionally, ensuring the transmission fluid is at the correct level and in good condition is essential. After the repairs are made, the vehicle should be test-driven to confirm that the issue has been resolved.
How to erase DTC P0779 on BMW
Once the underlying issue causing DTC P0779 on a BMW has been fixed, the fault codes can be cleared using a scan tool. This will erase the DTC P0779 code from the PCM’s memory. It is important to verify that the repair was successful by checking for any recurring fault codes or symptoms after clearing the 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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