Engine Error Message in Cold Weather - False Alarm?

Dear friends, over the past few years, I've observed an interesting issue during the winter months, specifically when temperatures are below freezing. I've learned to live with this problem. When I take it to the workshop (usually when the temperature is just above freezing, which always seems to happen at the workshop), they can't find anything wrong.

Here's what's happening: The car has to sit outside for an extended period (2 or more days) in cold weather. After starting the engine (which always starts immediately and without any problems), a warning appears in the center of the dashboard indicating that the coolant temperature/level is too low or too high, accompanied by a very loud beeping sound. Additionally, a flashing spiral icon (engine malfunction) appears. The engine runs normally, and the coolant temperature indicator turns off after a few minutes. However, the flashing spiral icon remains until the engine reaches its proper operating temperature of almost 90 degrees Celsius.

The two temperature gauges in the cockpit always display correct values. The engine is running perfectly without any problems and with full power.

The only annoying thing about this state (aside from the blinking and beeping) is that if you turn off the engine in the early phase, when the "engine fault" light is still flashing, you can't restart it immediately. The starter motor turns, but nothing happens. After about half an hour, the engine starts normally again. It was very embarrassing until I understood this behavior and once, at a major intersection with a red traffic light, I obediently turned off the engine, only to find that I couldn't restart it. Now I know that after the strange beeping sound related to the coolant temperature when starting, the engine should not be turned off until the temperature has almost reached 90 degrees.
If the outside temperature is above 0 degrees Celsius or higher, or if the engine has already been running that day, this problem does not occur.

What was measured:
3 error codes found:
This error persists.
00542 - Needle feed mechanism.
30-10 - Interruption / Short circuit after positive voltage - Occasional.

"These errors only occur in cold weather; I believe that when the 01442 component is present, the engine doesn't start. However, it's difficult to measure because after about 20 minutes, the problem disappears, and so do the displayed error messages."
01441 - Fuel starvation sensor (G210).
27-10 - implausible signal - sporadic.
01442 - Engine stalling due to fuel shortage.
35-00 - -

As I mentioned before, there are no misfires, erratic engine running, or lack of power.

Even if it were a faulty fuel level sender (G210), why does the coolant temperature alarm appear on the dashboard display with a loud beeping sound only when it's cold?
There seems to be something wrong with the engine's program or software, or possibly a contact problem in cold weather, which is very rare. Has anyone experienced something similar? Unfortunately, the error is difficult to reproduce at low temperatures and disappears again when the engine runs for a short time.

Hi,

I would check the relay for power supply from the engine control unit.

Best regards, Rainer.

These phenomena are often caused by temporary voltage drops, such as those that can occur with the ABS system.

Hi there,

Is the coolant level okay?
Is the coolant level sensor working properly?

Regards,
Adrian.

Often, a buildup also forms on the pins inside the coolant reservoir (the sensor). Considering the various error messages and effects combined with the failure to start, it's more likely that there are problems with the power supply from the engine control unit.

Best regards, Rainer.