honda90

Hi,
Have a 2011 GL350 and the CEL just came on, stopped at my mechanic and he put it on a scanner and it showed up as a code P20B9 and says reductant heater control.

I've found the error code online but it's described as a cylinder 9 fuel injector. Yet the mechanic says it reads as a heater control.

I did back about 5 days ago after I parked in my garage smelled a burning type smell when I parked. I thought it was weird, but there is nothing leaking and I didn't smell that again so I didn't worry too much.

I'm heading to Edmonton and to a mercedes dealership on Friday (for a pre-safe inop error code) so now I get to add this to the work order.

Will I make it safely there? Will the truck after a certain amount of miles shift the power down and I'll get stuck on the highway?

I'm not sure if this is a heater issue with my adblue tank or a fuel injector issue.

Any thoughts anyone???

tks!!!

honda90

Ok, so what does it mean when you wake up the next day and the CEL is gone? is it fixed, will it show again...

N_Jay

Many Error codes are based on a certain number of consecutive events.


So it goes on after some number of bad cycles and goes off after some number of good cycles.