P0151 GMC -

Question

I had my exhaust out while I rebuilt my 4L60E and now I have a P0151 Code.
I replaced the O2 Sensor and it is still coming up with the same P0151 Code.
I checked all my wiring and don't find any loose connectors.

Is there some way to test the connector on the vehicle side? What are the readings for a VOM for each post? I am stumped on this. I can rebuild about anything and been working on cars since I was 15...62 now. This is one area I lack any real knowledge.

Is there some other test I haven't asked? I am OPEN to almost anything at this point.

Thanks for considering my question.,
Robert

Answer 1

P0151 02 sensor circuit low voltage Bank 2 Sensor 1

This code mean there is a open circuit. and this being a type "A" code One of the many jobs of the ECM (In your case the VCM) is to look for open circuit, short circuit, grounds and rationality, What you have is a open circuit it would code right away. even when cleared if not resolved.  If there was no code condition prior to the transmission being removed , then theres the problem. At the transmission at the bell housing (or on the transmission)  are important ground wire, one of which is for the 02 sensor. If this ground is not sufficient you would  have a circuit low. You can do a voltage drop on the ground circuit that are on the transmission bell housing, No more than 0.5 volts allowed. (should be less) .

 From under the vehicle the 02 sensor is the one at the very top, which is prior to the catalytic convertor.