BMW DTC P085A – Gear Shift Control Module ‘B’ Communication Circuit
DTC P085A meaning on BMW
DTC P085A indicates a communication circuit problem with the Gear Shift Control Module ‘B’ in a BMW vehicle. This fault code is specific to the communication system between the transmission control module and the gear shift control module.
BMW DTC P085A symptoms
Symptoms of DTC P085A in a BMW may include issues with gear shifting, such as delayed or harsh shifting, the inability to shift gears, or the transmission getting stuck in a particular gear. Additionally, warning lights on the dashboard related to the transmission system may illuminate.
BMW DTC P085A causes
The causes of DTC P085A in a BMW can vary, but common reasons include faulty wiring or connectors in the communication circuit, a malfunctioning gear shift control module, or issues with the transmission control module.
BMW DTC P085A seriousness
DTC P085A should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this fault code may result in further damage to the transmission system and could potentially leave the vehicle inoperable.
How to diagnose DTC P085A on BMW
To diagnose DTC P085A on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the communication circuit between the transmission control module and the gear shift control module. This may involve checking the wiring, connectors, and the modules themselves for any signs of damage or malfunction.
How to fix DTC P085A on BMW
Fixing DTC P085A on a BMW may involve repairing or replacing any damaged wiring or connectors in the communication circuit. Additionally, the gear shift control module or transmission control module may need to be replaced if they are found to be faulty. It is recommended to follow the manufacturer’s repair procedures and use genuine BMW parts for the best results.
How to erase DTC P085A on BMW
Once the underlying issue causing DTC P085A has been fixed, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and reset the transmission system. It is important to ensure that the repair has been successful before clearing the fault 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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