BMW DTC P1704 – Transmission Fluid Temperature Sensor ‘A’ Circuit Shorted
DTC P1704 meaning on BMW
DTC P1704 on a BMW indicates a fault with the Transmission Fluid Temperature Sensor ‘A’ circuit being shorted. This sensor is responsible for monitoring the temperature of the transmission fluid, providing crucial data for the vehicle’s transmission control module.
BMW DTC P1704 symptoms
Symptoms of DTC P1704 on a BMW may include erratic shifting behavior, transmission slipping, overheating of the transmission fluid, and in some cases, the transmission going into a fail-safe mode to prevent further damage.
BMW DTC P1704 causes
The most common causes of DTC P1704 on a BMW are a short circuit in the wiring harness connected to the Transmission Fluid Temperature Sensor ‘A’, a faulty sensor itself, or issues with the transmission control module.
BMW DTC P1704 seriousness
While DTC P1704 may not cause immediate drivability issues, it is important to address this fault promptly to prevent potential damage to the transmission system. Ignoring this fault could lead to more severe transmission problems and costly repairs.
How to diagnose DTC P1704 on BMW
To diagnose DTC P1704 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and further investigate the transmission fluid temperature sensor circuit. This may involve checking the sensor’s resistance, inspecting the wiring for any visible damage, and testing the transmission control module for proper functionality.
How to fix DTC P1704 on BMW
Fixing DTC P1704 on a BMW usually involves repairing or replacing the Transmission Fluid Temperature Sensor ‘A’, addressing any wiring issues, or reprogramming the transmission control module if necessary. It is recommended to follow the manufacturer’s repair procedures and use genuine parts to ensure a proper fix.
How to erase DTC P1704 on BMW
Once the underlying issue causing DTC P1704 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. By clearing the code, the vehicle’s onboard computer will reset the transmission system’s parameters and monitor for any recurring faults.
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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