DTC cadillac P1A21 Short Explanation
Channel: Maxidot Cadillac
Date: 2020-06-20

The video focuses on the basic Cadillac 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:
Cadillac
Code:
P1A21
Definition:
Wheel Speed Signal, Left Front Wheel. Faulty Signal
Description:
The DSA control module receives wheel speed signals from the ABS control module.The ABS control module converts the wheel sensor AC signal into a pulsed signal for the DSA control module.The signal is pulsed between approximately 0 V and battery voltage.It has a fixed pulse ratio (%duty ≈ 50 %) where the frequency changes with the wheel speed.Depending on the current wheel speed signal,DTCs DSA-311, DSA-312, DSA-313 or DSA-314 are stored if the vehicle speed exceeds 8 km or h and the DSA control module registers that:Wheel speed increase or reduction is too great. The speed of a wheel is less or the same as half the speed of one of the rear wheels. The speed signal varies considerably.
Cause:
Open-circuit in the signal cable.Short-circuit to supply voltage or ground in the signal cable.Interference in the wheel sensor circuit.Contact resistance in the terminals.