DTC U1899 GMC
Power Supply. Signal Too Low
Power Supply. Signal Too Low
Description
The diagnostic trouble code (DTC) is stored if the control module registers that the power supply to the accessory electronic module (AEM) differs by more than 2 V from the power supply to the central electronic module (CEM). The diagnostic trouble code (DTC) can be diagnosed when the ignition is on.
Cause and Solution
Open-circuit or short-circuit to ground in the 30-supply for the accessory electronic module (AEM)Contact resistance, oxidation or loose connections in the 30-supply to the Accessory Electronic Module (AEM).
Video Guide
Diagnostic Info
- DTC Code: U1899
- Brand: GMC