P0138 Service Engine Code

By Big Buck
January 12, 2020 in Troubleshooting & Recalls

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Big Buck

Posted January 12, 2020

I have a 2015 GMC Sierra SLT 2500 4x4. Service engine light came on. Code reads P0138. Cleared code after checking gas cap. Service engine light and same code reappeared 4 days later. Anyone else have this problem ?

JD110

Posted January 12, 2020

P0138 is an heated oxygen sensor code.

Big Buck

Posted January 14, 2020

Author

Posted January 14, 2020

Code scanner showed bad O2 Sensor on Bank 1 Sensor 2. A bit unusual for only 20k miles on truck.

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