DTC cadillac U0120 Short Explanation
Channel: Maxidot Cadillac
Date: 20/06/2020

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:
U0120
Definition:
Electronic Throttle Control System - Forced Limited RPM
Description:
The Electronic Throttle Control (ETC) Motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the Throttle Body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.
Cause:
THROTTLE PLATE STUCK(K447) ETC MOTOR (+) CIRCUIT SHORTED TO GROUND(K448) ETC MOTOR (-) CIRCUIT SHORTED TO GROUNDETC MOTOR or THROTTLE BODYPOWERTRAIN CONTROL MODULE (PCM)