BMW DTC P1042 – Internal VVL-Control Module Random Access Memory (RAM) Error (Bank 1)
DTC P1042 meaning on BMW
The Diagnostic Trouble Code (DTC) P1042 for BMW indicates an Internal Variable Valve Lift (VVL) Control Module Random Access Memory (RAM) Error on Bank 1. This error suggests a malfunction in the VVL control module’s RAM, which is responsible for storing temporary data related to the variable valve lift system.
BMW DTC P1042 symptoms
Symptoms of the BMW DTC P1042 may include engine misfires, rough idling, reduced engine performance, decreased fuel efficiency, and in some cases, the vehicle may go into a limp mode where power is limited to prevent further damage.
BMW DTC P1042 causes
The causes of the DTC P1042 on a BMW can vary, but common reasons include a faulty VVL control module, wiring issues, poor connections, or a software glitch within the control module itself.
BMW DTC P1042 seriousness
The seriousness of the DTC P1042 error on a BMW should not be ignored, as it can lead to engine performance issues and potential long-term damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P1042 on BMW
To diagnose the DTC P1042 on a BMW, a professional diagnostic scanner capable of reading manufacturer-specific codes is required. The technician will scan the vehicle’s onboard computer to retrieve the fault code and perform further testing to pinpoint the exact cause of the RAM error in the VVL control module.
How to fix DTC P1042 on BMW
Fixing the DTC P1042 on a BMW typically involves replacing the faulty VVL control module, addressing any wiring issues or poor connections, and ensuring that the control module software is up to date. It is recommended to consult with a qualified mechanic or dealership to properly address and resolve this error code.
How to erase DTC P1042 on BMW
Once the underlying issue causing the DTC P1042 on a BMW has been fixed, the error code can be erased using a diagnostic scanner. The technician can clear the code from the vehicle’s computer system, and after driving the car for a while without any recurrence of the issue, the DTC P1042 should no longer be present.
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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