P0B3D and P0A2D
 

09 yukon with 200k, everything original. I had a rear main leaking and pulled the transmission last week, changed the rear main seal, rear plate seal, oil pan gasket, and torque converter seals for preventative maintenance. When I got everything back together I drove it and the P0B3D (block 1 out of range low) and P0A2D (drive motor "A" control module temperature sensor circuit out of range low) came on.

I had assumed they would be something to do with the transmission but neither seem to be. I hooked torque pro up and checked the cell voltages, she enough block 1 shows 0.0v??? Can it even move if there is really a block with 0v?

What is drive motor A? Could I have left something unplugged?

Re: P0B3D and P0A2D
 

For the P0A2D code check the 24 pin connector on the transmission. If you unplugged this, it's possible pins got damaged or is not seated properly.

Re: P0B3D and P0A2D
 

P0A2D is temp sensor out of range shorted? mentions near 5v
so that suggests the 5volts is shorted to signal ground.
(it's reporting the motor is minus -40C temp) 5 volts to signal ground
To detect temperature sensor out of range high(voltage)

P0B3D says the 1 block voltage low

secondary 12v system
Battery Pack Control module : power mode

Enable conditions
>=9v
<=18v
=RUN
P0A1F


that could have to do with the first code but see if you have any U codes(control module codes first ) this indicates there is an issue with the 12volt system such as bad cables or a bad battery..



since it's a 2009 good chance you have the defective poorly made quick release battery cables on it

Re: P0B3D and P0A2D
 

Do you remember if that’s the top or the bottom connector? Of course both are a pain to get to without dropping the cross member.

Re: P0B3D and P0A2D
 

no U codes so far, I have those cables but didn't disconnect the 12v battery for the repair, just the traction battery.

Re: P0B3D and P0A2D
 

Should be the larger, top one.

Re: P0B3D and P0A2D
 

You can get at both without dropping the cross member. It's a pain.

Black connector with lever is a Kostal part. It is power, ground, CAN data, and other signals to Transmission computer.

Other connector (tan?) has the motor sensors. Caution, 12 of those circuits are real fragile!

Both are a pain in the butt to get on correctly.

Re: P0B3D and P0A2D
 

thanks guys. I will jack it up tomorrow morning and see if I can adjust the connector

Re: P0B3D and P0A2D
 

OK, I took the connections off of the transmission, cleaned, and reseated them. That seemed to get rid of the P0A2D.

I am still left with the other one though. Can I really have a pair of cells out and still operate the yukon? I know I need to replace every one of the cells with newer ones but do I have a wire loose in the pack? I haven't been into the pack in months and the auto stop worked until I pulled the transmission so I assume they were all reading some voltage until then. Thought?
https://cimg7.ibsrv.net/gimg/www.gre...bdba41a6e.jpeg

Re: P0B3D and P0A2D
 

Next step would be to open up the battery. Inspect the sensing wire for the first block of modules. (Closest to fan) (go ahead and inspect all since you already have it open). Measure the block voltages with a multimeter. If the first one really reads 0.0V, which I find unlikely, then it would have to be dead short across 2 modules. Theres a higher probability of your sensing wire connections being corroded/damaged. Check the connector where all the sensing wires go into the battery energy control module (BECM). It may be that there is some corrosion in there.

Also, please log your module voltages so we can see how they change during steady discharge/charge. Based on the 1.7V difference from Block 2 and Block 15/17, your battery pack may be due for replacement.