Last reported case: 6 months ago
Based on 12 owner reports, 12 from forums)
What is C1500?
C1500 indicates a failure in the transfer case contact plate 'B' encoder circuit, which affects the 4WD/AWD system's ability to monitor or control the transfer case position. This is a medium-severity issue that can disable 4WD functionality and trigger warning lights, commonly reported in Chevrolet Silverado, Tahoe, and Suburban models. Based on real data, it typically triggers when the encoder circuit has electrical faults or sensor failures.
Common Causes:
- Electrical circuit faults in the transfer case encoder wiring or connectors (most common based on diagnostic patterns)
- Failed transfer case contact plate 'B' encoder sensor itself
- Corrosion or damage to wiring harnesses near the transfer case
Symptoms:
- 4WD/AWD system malfunction or failure to engage
- Warning lights on dashboard (often 4WD/service 4WD lights)
- Reduced traction in slippery conditions due to disabled 4WD
🚗C1500 on 2010 GMC Sierra
This page focuses specifically on C1500 issues reported by 2010 GMC Sierra owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 GMC Sierra Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 GMC Sierra owners
“Texas (DFW) 1989 GMC Sierra 1500 Like new $300 Pickup preferred I've got a pair of these spindles, new. They we're on my truck long enough to realize it was lower than I wanted to go and came right back off, they haven't been driven on.”View original
“They we're on my truck long enough to realize it was lower than I wanted to go and came right back off, they haven't been driven on. Asking $300 local, will ship at shippers cost.”View original
“1994 5.7 350 Twitchy RPMs when stopped Hello Everyone, I have been battling this problem for quite some time now, I have a 1994 Sierra C1500 with a new motor (less than 15,000 miles).”View original
“Built CS130 Alternator 140A - fs Texas 1989 GMC Sierra C1500 Used, good $80 Pickup only, not sure I can package it safely for shipping Remy Delco built locally by AES, I believe it's actually more than 140 but I can't find the receipt and the testers I used at Oreilly's and Autozone only go up to 140a for these so I'm selling it as a 140.”View original
“1989 Chevy c1500 with 5.7 and 700r4 transmission. been working on a truck i got. Friend and I replaced the head gasket because it was blown. the main thing was a blown head gasket. my friend and i got that taken care of. 1.We took the engine apart and replaced all the gaskets and seals and stuff.”View original
“The truck start and runs great. we drove it around the block and it shifts wonderfully ( previous owner installed new ( rebuilt ) transmission ). My friend even thinks it is way "stronger" than his 5.7 sierra. that does not matter.”View original
“I have a 1998 GMC SIERRA and noticed it does not have front or rear sway bars. Front look to have holes drilled for it but ot noticed any for the rear.”View original
“Will a defective CDM like bad capacitors keep the system from even powering on? I see reconditioned CDM for sale just hate to purchase if it may be the display head that is bad.”View original
“Tried doing some research and didn’t find much info. My exact vehicle info is a 1998 GMC c1500 Sierra SL, 4.3L engine, NV3500 trans, ext cab, 6.5 box.”View original
“My exact vehicle info is a 1998 GMC c1500 Sierra SL, 4.3L engine, NV3500 trans, ext cab, 6.5 box. Most of that info is useless because the only difference primarily of all the gmt 400 models are the badges.”View original
These are real experiences shared by 2010 GMC Sierra owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 12 discussions about C1500 from 2010 GMC Sierra owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 8/29/2025