MERCEDES-BENZ, MERCEDES-MAYBACH

LI20.10-P-074284

2022-01-26 · NHTSA 10207184

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Manufacturer summary

Original wording in English

Complaint Check engine light illuminated. Fault code P012800 current or stored in MRG1AMGV8 control unit. Cause Thermostat may not close completely Remedy 1-Perform coolant warmup test via fault P012800 and save the results 2-Drain coolant through fine sieve or filter and check for debris. 3-Remove and replace coolant thermostat. Check for any debris in thermostat or connections on engine. If debris found in step 2 or 3, flush engine and take pictures of debris. 4-Refill cooling circuit and clear faults. Warm engine during test drive. Allow to cool 6 hours. 5-Repeat coolant warmup test and save results. If LI was previously applied to the vehicle open a PTSS case with the below documents. -Initial quick test -MRG1AMGV8 control unit log -Coolant warmup tests before and after repair from previous visit -Coolant warmup test from current visit

Repeated filings are grouped only when make, bulletin number, publication date and complete summary agree. Original record numbers are retained. Older publications remain available, and an explicit later version is shown when established. Pre-1994 vehicle associations are separated from default results; an unspecified year does not mean all model years apply.