BMW DTC P1902 – Pressure Control Solenoid ‘C’ Shift Progress Too Low
DTC P1902 meaning on BMW
The Diagnostic Trouble Code (DTC) P1902 for BMW indicates an issue with the Pressure Control Solenoid ‘C’ Shift Progress being too low. This means that the transmission control module has detected that the pressure control solenoid responsible for regulating hydraulic pressure in the transmission is not functioning within the expected parameters.
BMW DTC P1902 symptoms
Symptoms of DTC P1902 on a BMW may include harsh shifting, delayed shifting, transmission slipping, decreased fuel efficiency, and in some cases, the transmission may go into a limp mode where it operates in a single gear only.
BMW DTC P1902 causes
The common causes of DTC P1902 on a BMW include a faulty pressure control solenoid ‘C’, low transmission fluid level, dirty or contaminated transmission fluid, wiring issues, or a malfunctioning transmission control module.
BMW DTC P1902 seriousness
Ignoring DTC P1902 on a BMW can lead to further damage to the transmission system, potentially resulting in costly repairs. It is important to address this issue promptly to prevent any long-term damage to the vehicle.
How to diagnose DTC P1902 on BMW
To diagnose DTC P1902 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes from the transmission control module. They would then inspect the pressure control solenoid ‘C’ for proper operation, check the transmission fluid level and condition, and perform a visual inspection of the wiring harness for any signs of damage.
How to fix DTC P1902 on BMW
Fixing DTC P1902 on a BMW may involve replacing the pressure control solenoid ‘C’, performing a transmission fluid flush and filter replacement, repairing any damaged wiring, or reprogramming the transmission control module. It is recommended to consult with a qualified mechanic or dealership for proper diagnosis and repair.
How to erase DTC P1902 on BMW
Once the underlying issue causing DTC P1902 on a BMW has been addressed and fixed, the fault codes 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 ensure that the repair has been successful before clearing the fault codes.
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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