BMW DTC P1806 – Shift Solenoid ‘A’ or ‘B’ Mechanically Stuck
DTC P1806 meaning on BMW
DTC P1806 indicates that the Shift Solenoid ‘A’ or ‘B’ is mechanically stuck in a specific gear position in a BMW vehicle. The transmission control module (TCM) has detected that the solenoid is not functioning properly, which can lead to issues with shifting gears.
BMW DTC P1806 symptoms
Symptoms of DTC P1806 in a BMW may include harsh shifting, delayed shifting, inability to shift gears, transmission slipping, and the transmission being stuck in a single gear. The vehicle may also experience reduced fuel efficiency and overall performance.
BMW DTC P1806 causes
The main causes of DTC P1806 in a BMW are typically related to a malfunctioning shift solenoid ‘A’ or ‘B’. This can be due to mechanical issues such as a stuck solenoid, electrical problems, or wiring issues. Low transmission fluid levels or contaminated fluid can also contribute to this fault code.
BMW DTC P1806 seriousness
DTC P1806 should be taken seriously as it can lead to further damage to the transmission if not addressed promptly. Ignoring this fault code can result in more severe transmission issues and potentially costly repairs in the future.
How to diagnose DTC P1806 on BMW
To diagnose DTC P1806 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes stored in the TCM. They would then inspect the shift solenoid ‘A’ and ‘B’ for any signs of physical damage or blockages. Testing the electrical connections and wiring associated with the solenoids is also crucial to pinpoint the root cause of the issue.
How to fix DTC P1806 on BMW
Fixing DTC P1806 on a BMW usually involves replacing the faulty shift solenoid ‘A’ or ‘B’. The solenoids are often located inside the transmission, so accessing them may require removing the transmission pan. It is essential to follow the manufacturer’s guidelines and use the correct replacement parts to ensure proper functionality.
How to erase DTC P1806 on BMW
Once the underlying issue causing DTC P1806 has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the TCM and turn off the check engine light. It is important to verify that the repair was successful by driving the vehicle and ensuring that the symptoms associated with the fault code have been eliminated.
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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