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I have recently encountered an intermittent issue with my. 2019 GLC, whereby the coolant light comes on at circa 90 degrees Celsius, the engine management light turns on and fan runs very loudly
I have had a diagnostics undertaken, and the below codes have come up:
U121A87- communication with control unit 'fan' has a a malfunctiom
U069800- communication with the component 'coolant pump' has a malfunction
U069987- Communication with the component 'coolant pump' has a malfunction. The message Is missing
Power consumption of component M43/6 (low temperature circuit circulation pump' is not ok
U011564- Communication with control drivetrain has a malfunction. There is an implausable signal
I was wondering if anybody else had has these codes pop up suddenly which could be related to an overarching part of the loom/sensor or component.
I have recently encountered an intermittent issue with my. 2019 GLC, whereby the coolant light comes on at circa 90 degrees Celsius, the engine management light turns on and fan runs very loudly
I have had a diagnostics undertaken, and the below codes have come up:
U121A87- communication with control unit 'fan' has a a malfunctiom
U069800- communication with the component 'coolant pump' has a malfunction
U069987- Communication with the component 'coolant pump' has a malfunction. The message Is missing
Power consumption of component M43/6 (low temperature circuit circulation pump' is not ok
U011564- Communication with control drivetrain has a malfunction. There is an implausable signal
I was wondering if anybody else had has these codes pop up suddenly which could be related to an overarching part of the loom/sensor or component.
Any help would be greatly appreciated
B
Hi, I have a same problem with my Mercedes did you resolve your problem? Thanks for replay
Hi @B17ant
Did you find any solutions to the above fault codes? I've gotten the same fault too. unable to solve, was hoping you have found a solution to the above faults.
Regards,
Kel
Last edited by KLCT_w205; Jan 5, 2025 at 04:11 AM.
I am having the same errors on my 2020 GLC 300. The first mechanic replaced the plastic coolant pipes to aluminum ones to fix the leaks and after that I started having the error on the dashboard. The dashboard error doesn't appear till ~40 min. of driving. I took it to another mechanic and they replaced pump 2 but it didn't resolve the issue. That rules out the pump 2 as a culprit I believe. Not sure what is the solution here. Did anyone go through similar issues?
This was just after reset. this was after driving for 40 min.
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