VIDEO

Informace

Cadillac

Cadillac P0B91

See the basic definition of a diagnostic error. This will help you to clarify the main causes of the fault code. You will understand the program of the control unit
Basic DTC analysis according to OBD2 protocol standard.

OBD2 or On-Board Diagnostics displays messages for basic group styles. More comprehensible code composition has been standard since 2000. The DTC code consists of five characters and its composition will be shown in this video

Insight into programming

The basic unit for the operation of any computer is the bit. Logic 0 and 1 are expressed by a single bit. Diagnostics The error code is composed of 16 bits. The first two bits define one of the four basic circuits. The video will show you a comprehensive overview of the composition of the error report

A diagnostically understandable description of the Diagnostic Trouble Code

Cadillac P0B91

Basic error definition

VEHICLE SPEED

Cause of DTC

If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. If DTC B2557 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. BCM detects the following difference between the vehicle speed from unified meter and the one from ABS actuator and electric unit for 10 seconds continuously: One is 10km h or more and the other is 4km h or less.