BMW DTC P0999 – Shift Solenoid ‘F’ Control Circuit High
DTC P0999 meaning on BMW
The Diagnostic Trouble Code (DTC) P0999 for BMW refers to the Shift Solenoid ‘F’ Control Circuit High. This code indicates that the transmission control module has detected an electrical fault in the circuit that controls the Shift Solenoid ‘F’. The Shift Solenoid ‘F’ is responsible for regulating the flow of transmission fluid to engage or disengage specific gears in the transmission.
BMW DTC P0999 symptoms
Symptoms of DTC P0999 on a BMW may include harsh shifting, delayed shifting, transmission slipping, transmission overheating, and in some cases, the transmission may go into a limp mode where it operates in a single gear only.
BMW DTC P0999 causes
The common causes of DTC P0999 on a BMW include a faulty Shift Solenoid ‘F’, damaged wiring or connectors in the control circuit, low transmission fluid level, contaminated transmission fluid, or a malfunctioning transmission control module.
BMW DTC P0999 seriousness
Ignoring or neglecting DTC P0999 on 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 transmission components.
How to diagnose DTC P0999 on BMW
To diagnose DTC P0999 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes stored in the transmission control module. They would then inspect the Shift Solenoid ‘F’, check the wiring and connectors for any damage, and perform a transmission fluid level and condition check.
How to fix DTC P0999 on BMW
Fixing DTC P0999 on a BMW may involve replacing the faulty Shift Solenoid ‘F’, repairing or replacing damaged wiring or connectors, ensuring the transmission fluid level is correct and free of contaminants, and resetting the transmission control module.
How to erase DTC P0999 on BMW
Once the underlying issue causing DTC P0999 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will erase the DTC P0999 code from the transmission control module’s memory and reset the system for normal operation.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.