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.
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Mercedes Benz B-Class Recall Notices
Common 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 ยป
Common B-Class Fault Codes
These are the most common B-Class fault codes that people are searching for.
4/10
P0128
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)
Learn More Fixes P1831
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Ground
Learn More
8/10
P0106
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
Learn 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.
