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What is the reason for the flashing snowflake and S indicators in Citroen transmission failure?

2 Answers

JackRose

07/25/25 3:22pm

Detailed explanation and solutions for the flashing snowflake and S indicators in Citroen transmission failure are as follows: 1. Low outdoor temperature: When the temperature inside the car is too low, causing the engine RPM to be too high, the S and snowflake indicators will flash. Solution: Adjust the temperature appropriately to prevent the fault. 2. Damaged outdoor temperature sensor: The outdoor temperature sensor may be damaged due to temperature effects, and it is necessary to check the transmission fault code. Solution: Replace the transmission oil using a circulation machine. 3. Signal transmission error: In case of signal transmission errors, use a computer diagnostic tool to read the fault codes stored in the control unit. Solution: Analyze possible causes based on the fault codes and eliminate the faults one by one.

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AndrewFitz

08/11/25 9:26pm

I noticed that the snowflake S flashing in Citroën transmissions often indicates a fault warning, primarily signaling an issue with the transmission control system. Possible causes include failure of the Transmission Control Unit (TCU) leading to software errors or hardware burnout; incorrect temperature readings from the oil temperature sensor triggering alarms; insufficient or degraded transmission fluid affecting lubrication and cooling performance; or mechanical failures like clutch wear causing the system to misinterpret overheating. Citroën models equipped with the AL4 transmission are particularly prone to this issue. For diagnosis, use an OBD scanner to read the fault codes and identify the specific cause, then check the fluid level (clean and transparent is ideal). If the fluid is dirty, replace it promptly. Ignoring this warning can lead to costly transmission overhauls, so I recommend visiting a professional repair shop as soon as possible and maintaining an annual fluid change to prevent issues. Remember, if you see this warning while driving, pull over and restart the engine. If the warning persists, arrange for a tow rather than risking further damage by continuing to drive.

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