BMW DTC P1640 – Internal Control Module RAM/ROM Error
DTC P1640 meaning on BMW
The Diagnostic Trouble Code (DTC) P1640 for BMW indicates an Internal Control Module RAM/ROM Error. This error occurs when the Engine Control Module (ECM) detects an issue with the internal memory of the control module, specifically the Random Access Memory (RAM) or Read-Only Memory (ROM).
BMW DTC P1640 symptoms
Symptoms of the BMW DTC P1640 may include engine performance issues such as rough idling, stalling, or hesitation during acceleration. Additionally, the vehicle may experience a decrease in fuel efficiency and overall power output. In some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P1640 causes
The DTC P1640 on a BMW can be triggered by various factors, including electrical faults, damaged wiring, or a malfunction within the Engine Control Module itself. Corrosion, loose connections, or short circuits in the control module can also lead to this error code.
BMW DTC P1640 seriousness
The DTC P1640 for BMW should be addressed promptly to prevent potential drivability issues and further damage to the vehicle’s engine control system. Ignoring this error code may result in poor engine performance and could lead to more severe problems over time.
How to diagnose DTC P1640 on BMW
To diagnose the DTC P1640 on a BMW, a professional diagnostic scanner or code reader can be used to retrieve the specific fault codes stored in the Engine Control Module. Additionally, a thorough inspection of the wiring harness, connectors, and control module components should be conducted to identify any visible signs of damage or corrosion.
How to fix DTC P1640 on BMW
Fixing the DTC P1640 on a BMW may involve repairing or replacing any damaged wiring, connectors, or components within the Engine Control Module system. In some cases, reprogramming or replacing the control module itself may be necessary to resolve the internal memory error. It is recommended to consult with a qualified automotive technician for proper diagnosis and repair.
How to erase DTC P1640 on BMW
Once the underlying issue causing the DTC P1640 on a BMW has been addressed and fixed, the error code can be cleared using a diagnostic scanner or code reader. By accessing the vehicle’s onboard computer system, the stored fault codes can be erased, and the Check Engine Light can be reset to ensure that the issue has been resolved.
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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