Some vehicles may experience the MIL on with DTC P0139 (HO2S circuit malfunction) stored in PCM memory....

Bulletin number

01-025-13-2822

Component

Power train: automatic transmission: control module (TCM/PCM/tecm)

Summary

Some vehicles may experience the mil on with dtc p0139 (ho2s circuit malfunction) stored in PCM memory. The PCM:1.monitors for a time-out malfunction (when ho2s remains above 0.2v for longer than a specified period of time during fuel cut control).2.measures the amount of time from when conditions are met until ho2s output voltage drops below 0.2v.3.determines a ho2s timeout malfunction when the detected time is more than 4 seconds for 2 of 3 times.this may be caused by carbon forming inside the electric throttle body (etb) which:1.reduces the air intake amount during deceleration (with fuel cut).2.allows fuel to remain around the ho2s.3.causes detection of p0139 (ho2s time-out fail).

Owners of these vehicles have filed 2 complaints in the transmission category.