Mercedes Benz B-Class Fault Codes
You can find common Mercedes Benz B-Class 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.
Jump To:Search Mercedes Benz B-Class Codes Mercedes Benz B-Class Recall Notices Common Mercedes Benz B-Class Codes
Search Mercedes Benz B-Class Codes
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Mercedes Benz B-Class 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 B-Class has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Mercedes Benz B-Class Recalls »
Common B-Class Fault Codes
These are the most common B-Class fault codes that people are searching for.
Turbo / Super Charger UnderboostLearn More Fixes
Intermediate Shaft Speed Sensor Circuit No signalLearn More
MAP / MAF - Throttle Position CorrelationLearn More Fixes
Exhaust Gas Recirculation Flow Insufficient DetectedLearn More Fixes
System Too Lean (Bank 1)Learn More Fixes
System Gross Leak Evaporative EmissionLearn More Fixes
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
Contr. Module LockedLearn More
Intake Manifold Runner Control Stuck Closed Bank 1Learn More
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
Diesel Particulate Filter Restriction - Soot AccumulationLearn More
Secondary Air Injection System MalfunctionLearn More
Incorrect Gear RatioLearn More
Random/Multiple Cylinder Misfire DetectedLearn More Fixes
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
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
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
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor ALearn 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 1)Learn More Fixes
System Too Rich (Bank 2)Learn More Fixes
Cylinder 1 Misfire DetectedLearn 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
Crankshaft Position Sensor A Circuit MalfunctionLearn More Fixes
Camshaft Position Sensor Circuit Range/PerformanceLearn More Fixes
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
Catalyst System Efficiency Below Threshold (Bank 2)Learn More Fixes
Evaporative Emission Control System Incorrect Purge flowLearn More Fixes
- Manufacturer: Mercedes Benz
About the B-Class
The B-Class was first released in 2005 as a subcompact executive minivan. The model was based heavily on the first two generations of the Mercedes A-Class, before it changed classes in the third generation.
Because of its focus on the premium, rivals are somewhat few. The BMW 2 Series Active/ Gran Tourer and Renault Scenic are some of the main competitors that come to mind.
Mercedes offers a range of petrol engines, as well as a single turbocharged diesel. Unfortunately, almost all of these are turbocharged, which is one of the most problematic systems for the B-Class.
Fault code P0299 is among the most searched issues for the model, indicating an underboost condition from the turbocharger.
One of the main causes for this issue on this model is a faulty boost pressure control flap. Another fairly common cause is a loose or damaged wastegate vacuum hose.
Another fairly common problem for the model is represented by fault code P0793. This code indicates a problem with the intermediate shaft speed sensor circuit.
This issue has been reported to make the B-Class behave very erratically. This can include shifting problems, reduced power, and false speedometer readings. According to a number of owners, a faulty transmission is usually the culprit for this issue.
Another fairly common issue for both Mercedes-Benz models and the B-Class is P0068. This code represents an issue between the mass airflow (MAF) sensor, manifold absolute pressure (MAP) sensor, and throttle position sensor.
All three of these sensors need to be carefully in alignment with one another. If any of these sensors become faulty, it can result in this and other codes being logged.
Owners have reported that faulty sensors are one of the most common causes for the issue, which can be a simple fix.