2021 Mercedes-Benz GLS580 Engine Is Stalling

Troubleshooting Causes of Engine Stalling in Your 2021 Mercedes-Benz GLS580 and How to Resolve Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Fuel System
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15% chance it's the
Air Intake System
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55% chance it's
Something else
The most common reasons a 2021 Mercedes-Benz GLS580 engine is stalling are the fuel system, the air intake system, or the ignition system.
  • Fuel System: A clogged fuel filter or failing fuel pump can restrict fuel flow, resulting in poor engine performance and starting issues.
  • Air Intake System: A dirty or damaged air filter or a malfunctioning mass airflow sensor can restrict airflow, leading to reduced engine performance and efficiency.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2021 Mercedes-Benz GLS580 engine is stalling?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

The most likely symptom of a faulty fuel temperature sensor is a check engine light. When the sensor goes bad, the Engine Control Module signals the driver that there is a problem by turning on the dash light. Poor fuel economy might also be noticed. In some cases, a failing fuel temperature sensor could lead to hard starting of the engine or an engine misfire and poor performance.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take when a 2021 Mercedes-Benz GLS580 engine is stalling?

When faced with a stalling engine in a 2021 Mercedes-Benz GLS580, it's essential to approach the diagnosis methodically to identify the root cause effectively. Start by checking for error codes using a diagnostic scanner, as these codes can reveal specific issues within the vehicle's computer system. Next, inspect the fuel system, including the fuel pump, filter, and injectors, for any signs of damage or blockages that could hinder fuel delivery. Following this, examine the ignition system components such as spark plugs and ignition coils to ensure they are functioning correctly and providing the necessary spark. It's also crucial to check the air intake system for cleanliness and obstructions that may restrict airflow to the engine. Additionally, inspect key sensors like the mass airflow and oxygen sensors, as their proper operation is vital for optimal engine performance. Lastly, evaluate the battery's health to confirm it is supplying adequate power for the engine's operation. By systematically addressing these areas, you can effectively diagnose and potentially resolve the stalling issue in your GLS580.

What are the common problems that could cause the engine to stall in a 2021 Mercedes-Benz GLS580?

When diagnosing engine stalling in a 2021 Mercedes-Benz GLS580, it's crucial to consider several common problems that may be at play. Start by examining the fuel system, as a clogged fuel filter or a malfunctioning fuel pump can disrupt fuel delivery, leading to stalling. Next, inspect the electrical system; components like the ignition coil or various sensors can fail and cause the engine to lose power unexpectedly. Additionally, check for airflow blockages, which can stem from a dirty air filter or a faulty mass airflow sensor, both of which can upset the delicate air-fuel mixture necessary for optimal engine performance. Don't overlook the ignition system, as worn spark plugs or a failing ignition module can also contribute to stalling issues. Lastly, be vigilant for vacuum leaks, as these can create an imbalance in the air-fuel mixture, further exacerbating stalling problems. By systematically addressing these areas, you can effectively troubleshoot and resolve engine stalling in your GLS580, ensuring a smoother driving experience.

How urgent is it to address the engine stalling issue in a 2021 Mercedes-Benz GLS580?

Addressing the engine stalling issue in a 2021 Mercedes-Benz GLS580 is of utmost urgency due to the significant safety risks it poses. An unexpected stall can lead to dangerous situations, particularly while navigating busy roads or highways, increasing the likelihood of accidents. Moreover, neglecting this problem can exacerbate existing issues, leading to more severe damage to critical engine components, which may result in costly repairs down the line. Timely intervention not only safeguards your safety but also ensures the vehicle remains dependable for everyday use, preventing the inconvenience of unexpected breakdowns. Therefore, it is crucial to prioritize the resolution of any stalling symptoms to maintain both the safety and reliability of your vehicle.

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2021 Mercedes-Benz GLS580 Engine Stalling Issues & Repairs