C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

W204 C180 coupe: Backup battery relay.

Old Jun 22, 2018 | 03:53 AM
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shalfira fira's Avatar
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C180 Coupe 2012
W204 C180 coupe: Backup battery relay.

Hello guys, my car always jerking every first 20 km/h only.. after i start the car and there are warnings pop-up says "1. Release parking break & 2. Front right/left malfunction, Consult workshop" After that it ran smoothly but sometimes the check engine warning light up but sometimes its gone automatically. So i went to workshop to diagnose, the fault code was P250513 (The power supply at the input of the control unit "combustion engine" has an electrical fault. There is an open circuit) but i don't know what exactly do i have to do with it. Several months after, i went to local mercedes agent to check.. but they update my software instead without my consent which got nothing to do with the car. The second time they check, they said its the backup battery relay (A0009822023).. is it really the relay or what.. and where can i find the new one online *cheap* ?

problem solved

Last edited by shalfira fira; Oct 20, 2018 at 09:37 AM.
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Old Dec 22, 2024 | 02:52 PM
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rhm132's Avatar
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Hi,
I have exact problem right now with my mercedes w204 C180 CGI
Have you replaced the relay K114 of the eco start/stop battery? And is the problem solved?
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Old Jul 16, 2025 | 10:02 AM
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shalfira fira's Avatar
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C180 Coupe 2012
I replaced the relay, and new backup battery in the bonnet, problem solved
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