BMW DTC P1864 – 5-4 Shift
DTC P1864 meaning on BMW
DTC P1864 for BMW refers to a fault with the 5-4 shift. This diagnostic trouble code indicates that there is an issue with the transmission’s ability to shift from 5th gear to 4th gear properly.
BMW DTC P1864 symptoms
Symptoms of DTC P1864 on a BMW may include harsh shifting between gears, delayed shifting, slipping gears, or the transmission getting stuck in a particular gear. Additionally, you may experience a decrease in fuel efficiency and overall performance.
BMW DTC P1864 causes
The most common causes of DTC P1864 on a BMW include low transmission fluid levels, a faulty transmission solenoid, a malfunctioning transmission control module (TCM), or internal transmission damage.
BMW DTC P1864 seriousness
Ignoring DTC P1864 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 vehicle.
How to diagnose DTC P1864 on BMW
To diagnose DTC P1864 on a BMW, a mechanic will typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer system. They will then perform a visual inspection of the transmission components, check the transmission fluid level and condition, and conduct various tests to pinpoint the exact cause of the issue.
How to fix DTC P1864 on BMW
Fixing DTC P1864 on a BMW may involve refilling or replacing the transmission fluid, repairing or replacing the transmission solenoid, addressing any issues with the TCM, or repairing any internal transmission damage. It is recommended to have a qualified mechanic perform the necessary repairs to ensure the issue is resolved correctly.
How to erase DTC P1864 on BMW
Once the underlying issue causing DTC P1864 on a BMW has been fixed, the fault codes can be cleared using a diagnostic scanner. This will reset the vehicle’s computer system and turn off the check engine light. It is important to ensure that the repairs have been successful before clearing the fault codes.
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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