BMW DTC P1802 – Shift Solenoid ‘B’ Circuit Low
DTC P1802 meaning on BMW
DTC P1802 on a BMW indicates an issue with the Shift Solenoid ‘B’ Circuit being detected as low. This fault code is specific to the transmission system and points towards a problem with the electrical circuit associated with the Shift Solenoid ‘B’.
BMW DTC P1802 symptoms
Symptoms of DTC P1802 on a BMW may include harsh shifting, delayed shifting, transmission slipping, or the transmission getting stuck in a particular gear. The vehicle may also experience decreased fuel efficiency and overall performance issues.
BMW DTC P1802 causes
The causes of DTC P1802 on a BMW can vary, but common reasons include a faulty shift solenoid ‘B’, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning transmission control module (TCM).
BMW DTC P1802 seriousness
DTC P1802 should be addressed promptly as it can lead to further damage to the transmission system if left unresolved. Ignoring this fault code may result in more severe transmission issues and potentially costly repairs.
How to diagnose DTC P1802 on BMW
To diagnose DTC P1802 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the shift solenoid ‘B’, wiring, and connectors. Testing the circuit for continuity and checking the transmission fluid level and condition are also essential steps in the diagnostic process.
How to fix DTC P1802 on BMW
Fixing DTC P1802 on a BMW may involve replacing the faulty shift solenoid ‘B’, repairing or replacing damaged wiring or connectors, ensuring the transmission fluid is at the correct level and in good condition, and resetting the TCM. It is recommended to follow the manufacturer’s repair procedures or seek assistance from a qualified mechanic.
How to erase DTC P1802 on BMW
To erase DTC P1802 on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s memory. After addressing the underlying issue causing the fault code, the scanner can be used to reset the TCM and ensure the code is successfully erased.
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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