Mercedes Benz GL (incl. GLS) Fault Codes
You can find common Mercedes Benz GL (incl. GLS) fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more detailed description.
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Search Mercedes Benz GL (incl. GLS) Codes
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Mercedes Benz GL (incl. GLS) Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Mercedes Benz GL (incl. GLS) has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Mercedes Benz GL (incl. GLS) Recalls »
Common GL (incl. GLS) Fault Codes
These are the most common GL (incl. GLS) fault codes that people are searching for.
System Too Rich (Bank 1)Learn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
Fuel Rail/System Pressure - Too HighLearn More
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Incorrect Gear RatioLearn More
Secondary Air Injection System MalfunctionLearn More
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Knock Sensor 2 Circuit (Bank 2)Learn More
Exhaust Camshaft Position Timing - Over-Retarded (Bank 1)Learn More
Thermostat Heater Control Circuit HighLearn More
Transmission Transfer Case Contact Plate 'D' Short Circuit To GroundLearn More
Intake Manifold Runner Control Stuck Closed Bank 1Learn More
System Gross Leak Evaporative EmissionLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
Diesel Particulate Filter Restriction - Soot AccumulationLearn More
Hydraulic Base Brake FailureLearn More
ABS Acceleration Switch Circuit FailureLearn More
ABS Outlet Valve Coil RF Circuit FailureLearn More
ABS Hydraulic Valve Circuit FailureLearn More
PRNDL Switch Circuit FailureLearn More
Transmission Range Sensor Circuit Malfunction (PRNDL Input)Learn More Fixes
Turbo / Super Charger UnderboostLearn More Fixes
Lost Communication With Instrument Panel Cluster (IPC) Control ModuleLearn More Fixes
Lost Communication With Anti-Lock Brake System (ABS) Control ModuleLearn More
Control Module Communication Bus "A" OffLearn More Fixes
Lost Communication With Glow Plug Control ModuleLearn More Fixes
Lost Communication with TCMLearn More
Contr. Module LockedLearn More
Intake Manifold Runner Control (Stuck Closed)Learn More
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To GroundLearn More
Calibration Resistor Out Of RangeLearn More
4X4 Initialization FailureLearn More
PSP Switch Out of Self Test RangeLearn More
Transmission Transfer Case Contact Plate 'D' Circuit FailureLearn More
Transmission Transfer Case Shift Motor Short Circuit To BatteryLearn More
Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit FailureLearn More
Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit FailureLearn More
DPFE Sensor Upstream Hose Off Or PluggedLearn More
EGR Flow Out Of Self Test RangeLearn More
Dual Alternator Upper FaultLearn More
Pump Speed Signal FaultLearn More
Inductive Signature Chip Communication ErrorLearn More
DPFE Circuit Low InputLearn More
Fuel Tank Pressure Relief Valve MalfunctionLearn More
GLOW PLUG FAILURELearn More
Traction Control Output Circuit MalfunctionLearn More
Ignition Coil C Primary Circuit MalfunctionLearn More
Intake Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Intake Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Intake Camshaft Position Timing - Over-Retarded (Bank 1)Learn More Fixes
Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Exhaust Camshaft Position Timing - Over-Advanced (Bank 1)Learn More Fixes
Heated Oxygen Sensor (HO2S) Heater Control Circuit Bank 1 Sensor 2Learn More Fixes
Mass or Volume Air Flow Circuit Low Voltage InputLearn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance ProblemLearn More Fixes
Intake Air Temperature Circuit High InputLearn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)Learn More Fixes
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)Learn More Fixes
System Too Rich (Bank 2)Learn More Fixes
Cylinder 2 Misfire DetectedLearn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
Cylinder 4 Misfire DetectedLearn More Fixes
Cylinder 5 Misfire DetectedLearn More Fixes
Cylinder 6 Misfire DetectedLearn More Fixes
Knock Sensor 1 Circuit (Bank 2 or Single Sensor)Learn More Fixes
Knock Sensor 2 Circuit Low Input (Bank 2)Learn More Fixes
- Manufacturer: Mercedes Benz
About the GL (incl. GLS)
The GL-Class first made its debut as a full-sized luxury SUV in 2006. There have been two further generations to hit the market since then, with the latest being released in 2020.
The three generations have been given the model designation of X164, X166, and X167 respectively. The model was renamed as the GLS when it received a facelift in 2016.
It sits above the Mercedes GLE, formerly known as the M-Class, in terms of sizing. This is a part of the GL-Class’ status as the flagship SUV model offered by Mercedes. Competition from outside of the company comes from rivals like the Audi Q7, BMW X5, and even the Land Rover Range Rover Sport.
The GL models are outfitted with a range of fairly high-performance modern engines. This does have its pros when it comes to performance, but also cons.
One of these cons happens to be fault code P0172 being the most commonly searched code for the model.
This code indicates that there is too much fuel in the air-fuel mixture. Unfortunately, the cause of the problem can be very hard to pinpoint, especially with such complex engines. However, owners have reported that poor maintenance can be one of the leading causes.
This can include issues like a faulty or dirty MAF sensor, as well as a faulty air filter. In some cases, defective fuel injectors can be the cause.
As if to illustrate how complex these engines can be, the second most common code is P0171, which represents that the engine is running too lean. Again, the code does not really help find the cause, but the MAF sensor is a good place to start again.
Both of these codes are limited to the first bank of the engine, which means GL models with V8s will only be affected on the one side, which can indicate it is not an upstream issue like the MAF sensor.