DTC U0106 GMC
Catalyst System Low Efficiency (Bank 1)
Catalyst System Low Efficiency (Bank 1)
Description
Engine started, ECT sensor from 18-230ºF, IAT sensor more than 18ºF, BARO sensor over 75 kPa, vehicle driven with the engine in closed loop, and the PCM detected the voltage swings (and switch rates) of the rear HO2S and front HO2S were similar for 96 seconds.
Cause and Solution
Air leaks in the exhaust manifold or exhaust pipesCatalytic converter is contaminated, damaged or has failedFront HO2S is older (aged) than the rear HO2S (HO2S is lazy)PCM has failed
Video Guide
Diagnostic Info
- DTC Code: U0106
- Brand: GMC