P2668 Diagnostic Trouble Code on Mercedes W164 320 CDI - How to Fix?

Model: W164 Fault Code: P2668 Posted: 2020-01-20 11:42

Hi everyone! I'm currently experiencing a P2668 Diagnostic Trouble Code on my 2009 Mercedes-Benz W164 32-0 CDI model. While I've searched extensively, this specific DTC doesn't appear in many official or community resources. The P2668 code relates to the 'Fuel Pump Control Circuit' and typically indicates an issue with the fuel pump control circuit or its associated sensors/relays. This is a known fault in some W164 320 CDI models, especially after long-term use or electrical wear. I'm looking for verified experiences from other owners who have encountered this code—what were their diagnostics and solutions? Any advice on how to troubleshoot the fuel pump control circuit (e.g., checking fuses, relays, wiring harnesses, or ECU communication) would be greatly appreciated. Thank you in advance for your insights! (Note: My English is not perfect—I used Google Translate to assist with this post.)