4wd and e-brake issues

6.2Midnight · January 28

Truck is a 2023 LTZ 6.2 SBCC. I was driving down the highway at about 45-50mph (extremely bad conditions here in Michigan currently) , I took the truck out of Auto back into 2H. I got a service 4wd message. I drove home in 2H. Parked the truck in my driveway and looked the issue up on the net. It said it may need to be re-programmed, frozen parts, broken parts. I tried to drive forward, the e- brake was locked on and still had the service 4wd message. I finally was able to get into my garage while brakes still locked. I let it warm up, the brake issue went away. I still do not have 4wd.

Any ideas?

Edited January 28 by 6.2Midnight

newdude · January 28

Scan it. See what codes are present.

6.2Midnight · January 28

1 hour ago, newdude said:

Scan it. See what codes are present.

That is the plan when I get home.

6.2Midnight · January 28

I scanned every module in the truck this is what it started as. After deleting the codes, only one remains C118D-13.

newdude · January 28

I wonder if the C118D caused the C05DD. C118D could be a failed actuator or something mechanical in the front axle, but could also result from wire chafe.

C05DD 98

Calculated Clutch Temperature = Greater than a predefined threshold

C05DD 98

4WD High/Locked = Transfer Case Clutch Torque — Disabled
4WD Low = Transfer Case Clutch Torque — Reduced
Front Axle = Disengaged
Driver Information Display = Service 4WD

- If the DTC C05DD sets
1. A mechanical condition may exist in the front axle assembly, verify 4WD engages properly.

There's a bunch of circuit testing for the C118D. C05DD mainly makes you verify that all 4 wheel speed sensors are reading within 1mph of each other.

Edited January 28 by newdude

6.2Midnight · January 28

When I have a chance to inspect the wiring for damage or the sort, I'll leave more information. I'm wondering if it was from snow and or ice build up. We've been getting hit pretty hard here in Michigan with both over the last week and a half. We've seen a low as -28°, and with the highest travel to and from work it is possible that it built up. I park it in my garage every night, I have the heat set to 50° during the winter.

6.2Midnight · February 1

I'm trying to find the wiring diagram to the connector that plugs onto the actuator at the front diff. I keep finding older models. This is how I searched it.

wiring diagram for 2023 chevy silverado 1500 front 4wd 4 wire axle actuator

bigimp65 · February 3

on my 2020 denali, the only problem i have ever had is ebrake related. a few times ( 2-3 times and many months apart) have had all the messages: service this, service that...each time after deploying the ebrake and then trying to drive a short time later, within 5 mins. each time i disconnected the neg battery and everything cleared up and was back to normal. I belive its related to the automatic release of the ebrake when hitting gas. i now always release manually before driving, although i dont actually use the ebrake very often.