# Service bulletin LI20.10\-P\-074284

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10207184
- Published by NHTSA: 2022\-02\-04
- Manufacturer's number: LI20.10\-P\-074284
- Manufacturer's date: 2022\-01\-26
- NHTSA component: EQUIPMENT; ENGINE AND ENGINE COOLING

## NHTSA's summary

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

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10207184-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10207184-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Equipment and accessories

## Trouble codes named

P0128

## Vehicles listed

- 2022 MERCEDES\-BENZ S 500 4MATIC
- 2022 MERCEDES\-BENZ S 580 4MATIC
- 2022 MERCEDES\-MAYBACH S 680 4MATIC

JSON: [/v1/bulletins/10207184](/v1/bulletins/10207184)

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