BMW DTC P0815 – Upshift Switch Circuit
DTC P0815 meaning on BMW
The Diagnostic Trouble Code (DTC) P0815 for BMW refers to the Upshift Switch Circuit. This code indicates that there is a malfunction in the circuit responsible for detecting the upshift switch signal in the transmission control module.
BMW DTC P0815 symptoms
Symptoms of DTC P0815 on a BMW may include issues with the transmission shifting properly, hesitation or jerking during gear changes, and the transmission staying in a particular gear for too long.
BMW DTC P0815 causes
The common causes of DTC P0815 on a BMW include a faulty upshift switch, damaged wiring or connectors in the upshift switch circuit, or a malfunction in the transmission control module.
BMW DTC P0815 seriousness
While DTC P0815 may not always result in immediate drivability issues, it can lead to transmission performance problems if left unresolved. It is important to address this code promptly to prevent further damage to the transmission system.
How to diagnose DTC P0815 on BMW
To diagnose DTC P0815 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer system. They would then inspect the upshift switch, wiring, and connectors for any visible damage or corrosion. Testing the switch and circuit for continuity and proper voltage would also be necessary.
How to fix DTC P0815 on BMW
Fixing DTC P0815 on a BMW may involve replacing the upshift switch if it is found to be faulty. Repairing or replacing damaged wiring or connectors in the circuit is also necessary. In some cases, reprogramming or replacing the transmission control module may be required to resolve the issue.
How to erase DTC P0815 on BMW
Once the underlying issue causing DTC P0815 on a BMW has been fixed, the fault codes can be cleared using a diagnostic scanner. This will erase the code from the vehicle’s computer system and reset the Check Engine Light. It is important to ensure that the repair has been successful before clearing the fault code.
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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