DTC Chevrolet B0957-21 Short Explanation
Channel: Maxidot Chevrolet
Date: 20/06/2020

The video focuses on the basic Chevrolet specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
Chevrolet
Code:
B0957 21
Definition:
Mass Airflow Sensor Plausibility
Description:
The plausibility error of the throttle position sensor (main) is detected.The plausibility error of the throttle position sensor (sub) is detected.For 0.36 second,the difference between the volumetric efficiency estimated by the throttle position sensor (main) and the volumetric efficiency estimated by the throttle position sensor (sub) is 8.8 percent or less.
Cause:
 Mass airflow sensor system failed. Intake system vacuum leak. There is some trash around mass airflow sensor. ECM failed.
Failure Type:
Signal Amplitudelower then Minimum
This sub type is used for failures where the control module measures a signal voltage below a specified range but not necessarily a short to ground (e.g., low gain).