DTC Hummer B1420 Short Explanation
Channel: Maxidot
Date: 2020-10-23

The video focuses on the basic Hummer 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:
HUMMER
Code:
B1420
Definition:
Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 2)
Description:
The ECM detects greater than 10 crankshaft revolutions.The engine speed is less than 2,520 RPM.The DTCs run continuously once the above condition is met.The CMP sensor signal voltage is always high and the ECM detects no pulses from the CMP sensor for greater than 1 second or cumulative of 10 seconds.
Cause:
 Low reference circuit for an open or high resistance or for a short to voltage 5 volt reference circuit for an open or high resistance Short to voltage in the signal circuit Short to ground or an open or high resistance in the signal circuit. CMP has failed ECM has failed