BMW DTC P099A – Shift Solenoid ‘G’ Control Circuit Range/Performance
DTC P099A meaning on BMW
The Diagnostic Trouble Code (DTC) P099A for BMW refers to a Shift Solenoid ‘G’ Control Circuit Range/Performance issue. This code indicates that there is a problem with the control circuit of the Shift Solenoid ‘G’ in the transmission system of the vehicle.
BMW DTC P099A symptoms
Symptoms of the DTC P099A on a BMW may include:
- Harsh shifting between gears
- Transmission slipping
- Transmission not shifting properly
- Check Engine Light illuminated on the dashboard
BMW DTC P099A causes
Common causes of the DTC P099A on a BMW include:
- Faulty Shift Solenoid ‘G’
- Wiring or connector issues in the control circuit
- Low transmission fluid level
- Internal transmission problems
BMW DTC P099A seriousness
The DTC P099A should not be ignored as it can lead to further transmission issues if left unresolved. Driving with this fault can cause damage to the transmission components and may result in costly repairs.
How to diagnose DTC P099A on BMW
To diagnose the DTC P099A on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the Shift Solenoid ‘G’ and its wiring for any visible damage
- Check the transmission fluid level and condition
- Perform a test drive to observe the shifting behavior
How to fix DTC P099A on BMW
To fix the DTC P099A on a BMW, the following steps may be taken:
- Replace the faulty Shift Solenoid ‘G’
- Repair any damaged wiring or connectors in the control circuit
- Ensure the transmission fluid level is correct and top up if necessary
- If internal transmission issues are found, a transmission rebuild or replacement may be required
How to erase DTC P099A on BMW
After the issue causing the DTC P099A has been fixed, the fault codes can be cleared using a diagnostic scanner. This will erase the DTC P099A code from the vehicle’s memory and turn off the Check Engine Light.
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.