BMW DTC P1644 – Throttle Valve Adaptation Stop Relearning Lower Mechanical Stop (Bank 1)
DTC P1644 meaning on BMW
DTC P1644 on a BMW indicates an issue with the Throttle Valve Adaptation Stop Relearning Lower Mechanical Stop on Bank 1. This fault code is related to the throttle valve adaptation process, which is responsible for ensuring proper throttle response and performance.
BMW DTC P1644 symptoms
Symptoms of DTC P1644 on a BMW may include rough idling, poor acceleration, reduced engine power, and potentially an illuminated check engine light on the dashboard. The vehicle may also exhibit hesitation or stalling during acceleration.
BMW DTC P1644 causes
The most common causes of DTC P1644 on a BMW are a faulty throttle body, throttle position sensor issues, vacuum leaks, or a malfunctioning electronic throttle control system. Additionally, a dirty throttle body or carbon buildup can also trigger this fault code.
BMW DTC P1644 seriousness
While DTC P1644 may not cause immediate safety concerns, it can lead to drivability issues and reduced engine performance. Ignoring this fault code can potentially result in further damage to engine components over time.
How to diagnose DTC P1644 on BMW
To diagnose DTC P1644 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the throttle body, throttle position sensor, and related components. Checking for vacuum leaks and conducting a visual inspection of the throttle system can help pinpoint the root cause of the issue.
How to fix DTC P1644 on BMW
Fixing DTC P1644 on a BMW may involve cleaning the throttle body, replacing the throttle position sensor, repairing any vacuum leaks, or recalibrating the electronic throttle control system. In some cases, a software update or throttle adaptation reset may be necessary to resolve the fault code.
How to erase DTC P1644 on BMW
Once the underlying issue causing DTC P1644 on a BMW has been addressed, the fault code can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. After clearing the code, it is recommended to test drive the vehicle to ensure the fault does not reoccur.
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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