DTC U1144 GMC

O2 Circuit (Bank 1, Sensor 2)

O2 Circuit (Bank 1, Sensor 2)

Description

Modeled exhaust gas temp. 250-700° C Heater active for longer than, 50 Sec. Catalyst heating, Not active SAI, Not active

Cause and Solution

HO2S FusesHO2S terminal corrosionOpen between HO2S and Power supply relayOpen or Short? between HO2S and ECMFaulty HO2SFaulty ECM

Video Guide

Duration: PT3M52S | Uploaded: 2020-06-20

Diagnostic Info

  • DTC Code: U1144
  • Brand: GMC
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