DTC U2104 GMC
Front Heated Oxygen Sensor (HO2S), Faulty Signal (Bank 2)
Front Heated Oxygen Sensor (HO2S), Faulty Signal (Bank 2)
Description
The engine control module (ECM) monitors the operation of the heated oxygen sensor (HO2S) by checking its signal. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers any of the following. The engine control module (ECM) compares the front and rear heated oxygen sensor (HO2S) adaptation values. The diagnostic trouble code (DTC) is stored when the values deviate by more than 3%. Note! The fault may be in the front or rear heated oxygen sensor (HO2S) circuit. The signal from the front heated oxygen sensor (HO2S) indicates a lean fuel air mixture. The signal from the rear heated oxygen sensor (HO2S) indicates a rich fuel air mixture The signal from the front heated oxygen sensor (HO2S) indicates a rich fuel air mixture. The signal from the rear heated oxygen sensor (HO2S) indicates a lean fuel air mixture The signal from the heated oxygen sensor (HO2S) indicates an incorrectly rich lean fuel air mixture compared to what is expected by the engine control module (ECM).
Cause and Solution
Leakage in the exhaust systemShort-circuit to supply voltage or ground in signal cable (-)Short-circuit to supply voltage or ground in the pump supply cableShort-circuit to supply voltage or ground in calibration supply cableOpen-circuit in signal cable plusDamaged heated oxygen sensor (HO2S).
Video Guide
Diagnostic Info
- DTC Code: U2104
- Brand: GMC