BMW DTC P099C – Shift Solenoid ‘G’ Control Circuit High
DTC P099C meaning on BMW
The Diagnostic Trouble Code (DTC) P099C for BMW refers to a Shift Solenoid ‘G’ Control Circuit High. This code indicates that the control circuit for the Shift Solenoid ‘G’ is experiencing a high voltage condition, which can lead to improper shifting behavior in the transmission system.
BMW DTC P099C symptoms
Symptoms associated with the BMW DTC P099C may include harsh shifting, delayed shifting, transmission slipping, or the transmission not shifting at all. Additionally, the vehicle’s Check Engine Light may illuminate to indicate a problem with the transmission system.
BMW DTC P099C causes
The causes of the DTC P099C on a BMW can vary, but common reasons include a faulty Shift Solenoid ‘G’, damaged wiring or connectors in the control circuit, or issues with the transmission control module.
BMW DTC P099C seriousness
Ignoring the DTC P099C on a BMW can lead to further damage to the transmission system and potentially result in drivability issues. It is important to address this code promptly to prevent more severe transmission problems.
How to diagnose DTC P099C on BMW
To diagnose the DTC P099C on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the code and then perform a thorough inspection of the Shift Solenoid ‘G’, wiring, connectors, and transmission control module. Testing the electrical components and conducting a visual inspection can help pinpoint the exact cause of the issue.
How to fix DTC P099C on BMW
Fixing the DTC P099C on a BMW may involve replacing the faulty Shift Solenoid ‘G’, repairing damaged wiring or connectors, or addressing any issues with the transmission control module. It is recommended to follow the manufacturer’s repair procedures and use quality replacement parts to ensure proper functionality of the transmission system.
How to erase DTC P099C on BMW
Once the underlying issue causing the DTC P099C on a BMW has been resolved, the code can be erased using a diagnostic scanner. By clearing the code, the Check Engine Light should turn off, indicating that the problem has been addressed. It is important to verify that the issue has been fixed 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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