BMW DTC P1779 – Transmission Fluid Temperature/TCM Temperature Correlation
DTC P1779 meaning on BMW
DTC P1779 on a BMW refers to the Transmission Fluid Temperature/TCM Temperature Correlation. This diagnostic trouble code indicates that there is a discrepancy between the transmission fluid temperature and the temperature measured by the Transmission Control Module (TCM).
BMW DTC P1779 symptoms
Symptoms of DTC P1779 on a BMW may include erratic shifting, transmission slipping, overheating, or the transmission going into limp mode. The Check Engine Light may also illuminate on the dashboard.
BMW DTC P1779 causes
The causes of DTC P1779 on a BMW can vary and may include issues such as a faulty transmission fluid temperature sensor, a malfunctioning TCM, wiring or connection problems, or low transmission fluid levels.
BMW DTC P1779 seriousness
DTC P1779 should be taken seriously as it can lead to further damage to the transmission if left unresolved. Ignoring this code may result in transmission failure or other drivability issues.
How to diagnose DTC P1779 on BMW
To diagnose DTC P1779 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer. They would then inspect the transmission fluid temperature sensor, check the TCM for proper operation, and ensure all wiring and connections are secure.
How to fix DTC P1779 on BMW
Fixing DTC P1779 on a BMW may involve replacing the transmission fluid temperature sensor, repairing any wiring or connection issues, or replacing the TCM if necessary. It is important to address the root cause of the problem to prevent further transmission damage.
How to erase DTC P1779 on BMW
Once the underlying issue causing DTC P1779 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle to operate normally again.
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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