2011 GMC Yukon XL Denali ecu

[glaw93]

Hey guys new to the forum. So about 2 weeks ago went to the gas station turned the car off put fuel in it went to fire it back up nothing. I’ve got a C0899 code has anyone else had this problem. Any info I’d appreciate it!

 

[Dustin Jackson]

What troubleshooting steps have you taken so far?

Does the vehicle still not run?

 

[PG01]

Hey guys new to the forum. So about 2 weeks ago went to the gas station turned the car off put fuel in it went to fire it back up nothing. I’ve got a C0899 code has anyone else had this problem. Any info I’d appreciate it!

Check your battery and cables, alternator etc.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[glaw93]

What troubleshooting steps have you taken so far?

Does the vehicle still not run?

I have checked the battery voltage all my fuses I’ve ran a check on the alternator. I am pulling the starter and gonna check to see if it’s gone bad

 

[Dustin Jackson]

@glaw93 I would check grounds and battery cables, can't get much info on that code but it seems to be the computer isn't getting the power it wants?

 

[petethepug]

C0899 - Module Power Circuit Malfunction/Low Voltage.

Low voltage is what sticks out here as the most common issue. The battery cables Rot from the inside out and cause DTC’s that disappear and migrate throughout the 5v can/bus system creating real life gremlins.

Check your main ground wire under the motor and replace the +\- battery cables. All diagnostics from that point will reveal data that’s not corrupted by low voltage.

We’re you able to drive it away after this? Is this the first occurrence? Any recent work done on the 11 YXL Denali?