BMW DTC P1881 – 1-2 Shift Circuit High
DTC P1881 meaning on BMW
DTC P1881 on a BMW indicates a problem with the 1-2 shift circuit being detected as high. This means that the signal voltage for the 1-2 shift is outside of the expected range, causing the transmission control module to set the trouble code.
BMW DTC P1881 symptoms
Symptoms of DTC P1881 on a BMW may include harsh shifting between the first and second gears, delayed shifting, or the transmission staying in one gear. The vehicle may also experience reduced fuel efficiency and overall performance.
BMW DTC P1881 causes
The most common causes of DTC P1881 on a BMW include a faulty shift solenoid, damaged wiring or connectors in the 1-2 shift circuit, low transmission fluid level, or a malfunctioning transmission control module.
BMW DTC P1881 seriousness
While DTC P1881 may not always result in immediate drivability issues, it is important to address this code promptly to prevent further damage to the transmission system. Ignoring the issue can lead to more severe transmission problems and potentially costly repairs.
How to diagnose DTC P1881 on BMW
To diagnose DTC P1881 on a BMW, a mechanic will typically start by using a diagnostic scanner to retrieve the trouble codes stored in the transmission control module. They will then inspect the shift solenoid, wiring, and connectors in the 1-2 shift circuit for any visible damage or corrosion. Testing the transmission fluid level and quality may also be necessary.
How to fix DTC P1881 on BMW
Fixing DTC P1881 on a BMW may involve replacing the faulty shift solenoid, repairing or replacing damaged wiring or connectors, ensuring the transmission fluid level is correct, or reprogramming the transmission control module. It is recommended to have a qualified mechanic perform the necessary repairs to ensure proper diagnosis and resolution of the issue.
How to erase DTC P1881 on BMW
Once the underlying issue causing DTC P1881 on a BMW has been addressed and fixed, the trouble code can be cleared using a diagnostic scanner. This will reset the transmission control module and turn off the check engine light. It is important to verify that the issue has been resolved before clearing the code to prevent it from reoccurring.
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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