Codes for LML

[rebel7777]

I just recently had my 12 truck through 2 codes, 0203B & 0205B, what are these about? Can anyone help?

Truck won't autostart anymore, its hard starting and runs with a whine out of the exhaust.

Hope I posted in the right area,

 

[Harbin_22]

Sure it wasnt P0203? It wont remote start with a check engine light on

 

[chevyburnout1]

P203B-Reductant Fluid Level Sensor Performance
P205B-Reductant Tank Temperature Sensor Performance

Sounds like there is an issue with your urea tank. Possibly a wiring issue. If these codes set it will disable the remote start function. Shouldn't cause a hard start though...

 

[Texas Chevy]

P203B-Reductant Fluid Level Sensor Performance
P205B-Reductant Tank Temperature Sensor Performance

Sounds like there is an issue with your urea tank. Possibly a wiring issue. If these codes set it will disable the remote start function. Shouldn't cause a hard start though...

X2 a buddy of mine had those codes had to have the urea tank replaced. And no it won't start with the check engine light on

 

[rebel7777]

It's hard to start, actually has stalled on me a couple of times, since the codes were thrown. Wierd I know, I hate this Urea crap, I may just end up removing it, sad at only 8000 miles.

I'll take it in to the dealer, how long to typically get the tank replaced if this is the issue?

 

[chevyburnout1]

You may have more than one issue. There is a bulletin out for the fuel filter sensor leaking and causing air to get sucked into the fuel supply system and causing a hard start. May be your issue, on top of the urea tank problem. Urea tank doesn't take long at all to replace, its just the BS hoops the technician will have to jump through to make GM happy.

Or it could just be a wiring issue...

 

[DBUSHLB7]

You may have more than one issue. There is a bulletin out for the fuel filter sensor leaking and causing air to get sucked into the fuel supply system and causing a hard start. May be your issue, on top of the urea tank problem. Urea tank doesn't take long at all to replace, its just the BS hoops the technician will have to jump through to make GM happy.

Or it could just be a wiring issue...

This guy is sharp for an oil change tech! It's like he has access to GM computers with step by step DTC troubleshooting procedures

 

[rebel7777]

You may have more than one issue. There is a bulletin out for the fuel filter sensor leaking and causing air to get sucked into the fuel supply system and causing a hard start. May be your issue, on top of the urea tank problem. Urea tank doesn't take long at all to replace, its just the BS hoops the technician will have to jump through to make GM happy.

Or it could just be a wiring issue...

Wouldn't there be diesel on the ground if this is the case?

 

[chevyburnout1]

No because the fuel supply system is under a vacuum. There is no fuel pump pressurizing the lines. So it would be sucking air through the fuel filter sensor into the fuel supply system. The bigger the leak/vacuum, the more air that can in theory get sucked in. I for one have not personally seen one of those fail yet however our dealership is small.