BMW DTC P0799 – Pressure Control Solenoid ‘C’ Intermittent
DTC P0799 meaning on BMW
The Diagnostic Trouble Code (DTC) P0799 for BMW refers to an intermittent issue with the Pressure Control Solenoid ‘C’. This code indicates that the vehicle’s engine control module (ECM) has detected a problem with the operation of the pressure control solenoid ‘C’ in the transmission control system.
BMW DTC P0799 symptoms
Symptoms of a DTC P0799 on a BMW may include erratic shifting behavior, harsh or delayed gear changes, transmission slipping, and in some cases, the transmission may go into a limp mode where it operates in a single gear only.
BMW DTC P0799 causes
The intermittent nature of the DTC P0799 can be caused by various factors, including a faulty pressure control solenoid ‘C’, wiring or connector issues, low transmission fluid level, dirty or contaminated transmission fluid, or internal transmission problems.
BMW DTC P0799 seriousness
Ignoring a DTC P0799 on a BMW can lead to further transmission damage and potentially unsafe driving conditions. It is important to address this issue promptly to prevent more severe transmission problems and ensure the vehicle’s drivability and safety.
How to diagnose DTC P0799 on BMW
To diagnose a DTC P0799 on a BMW, a mechanic would typically start by using a diagnostic scan tool to retrieve the fault code and check for any related codes. They may then inspect the pressure control solenoid ‘C’, test the wiring and connectors for continuity and proper voltage, check the transmission fluid level and condition, and perform a thorough visual inspection of the transmission components.
How to fix DTC P0799 on BMW
Fixing a DTC P0799 on a BMW may involve replacing the pressure control solenoid ‘C’ if it is found to be faulty, repairing any damaged wiring or connectors, performing a transmission fluid flush and filter replacement, or addressing any internal transmission issues. It is recommended to follow the manufacturer’s repair procedures and use quality replacement parts to ensure a proper fix.
How to erase DTC P0799 on BMW
Once the underlying issue causing the DTC P0799 on a BMW has been diagnosed and fixed, the fault code can be cleared using a diagnostic scan tool. This will reset the ECM’s memory and turn off the Check Engine Light. It is important to verify that the issue has been resolved before clearing the code to prevent it from reoccurring.
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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