2021 Mercedes-Benz AMG GT Oil Pressure Message TSB

Mercedes-Benz has released Technical Service Bulletin (TSB) LI18.00-P-073137, Version 2, dated January 4, 2022, to address a specific oil pressure warning issue affecting passenger cars equipped with the M256 engine, including the 2021 Mercedes-Benz AMG GT. This bulletin provides updated steps for diagnosing and resolving a sporadic "Engine oil pressure stop switch off vehicle" message appearing in the instrument cluster.

Symptoms

Owners of affected vehicles, particularly those with low mileage, may observe a sporadic warning message in the instrument cluster. The primary symptom is the message "Engine oil pressure stop switch off vehicle" (or similar phrasing) displayed in red. This is typically accompanied by the "Engine oil pressure indicator lamp > lit" on the dashboard, indicating a potential problem with the engine's oil lubrication system. This warning requires prompt attention to prevent potential engine damage.

Fault Codes / DTCs

When the "Engine oil pressure stop switch off vehicle" warning appears, diagnostic scans may reveal specific fault codes stored in the N127 - Control unit 'Powertrain' (PTCU). These codes indicate that the engine's oil pressure is too low, which can restrict system function.

Diagnosis and Cause

The root cause for the 2021 Mercedes-Benz AMG GT oil pressure message is often a sticking directional control valve. This valve plays a crucial role in regulating oil flow and pressure within the M256 engine. When it sticks, it can lead to insufficient oil pressure, triggering the warning message and associated fault codes.

Initial diagnostic steps involve checking the engine oil level in the instrument cluster and correcting it if necessary. Technicians are then instructed to perform approximately 10-15 engine starts, followed by clearing any stored fault codes. A road test is crucial to determine if the issue has been resolved.

Repair Procedure Summary

If the fault codes or the "Engine oil pressure stop switch off vehicle" warning reoccurs after the initial checks and road test, the TSB directs technicians to install a new directional control valve. This involves removing the existing valve and replacing it with a new one. Mercedes-Benz provides specific WIS-References for this procedure, including AR18.10-P-0002MSA for models 213, 238, 257, 290; AR18.10-P-0002SB for model 223; and AR18.10-P-0002MSC for model 167. These references guide technicians through the precise steps for removal and installation.

Required Parts

The primary part required for this repair, if the directional control valve is found to be faulty, is the new directional control valve itself. The part number specified in the bulletin is A2561800415.

What Owners Should Do

If you own a 2021 Mercedes-Benz AMG GT and experience the "Engine oil pressure stop switch off vehicle" warning or the engine oil pressure indicator lamp illuminates, it is important to contact your authorized Mercedes-Benz service center promptly. Addressing the Mercedes-Benz AMG GT oil pressure message quickly can prevent potential engine damage. Your dealer will perform the necessary diagnostic steps outlined in TSB LI18.00-P-073137 and carry out the appropriate repair.

Source: NHTSA ID 10207183