C1500 on GMC SIERRA — Transfer Case Contact Plate "B" Encoder Circuit Failure

Q: "What does C1500 mean on a GMC SIERRA?"

"C1500 indicates: Transfer Case Contact Plate \"B\" Encoder Circuit Failure. This is a chassis code. 3 GMC SIERRA owners have reported this to NHTSA."

Q: "What are the most common causes of C1500 on GMC SIERRA?"

"Based on 3 NHTSA reports, the most commonly cited components are: Air Bags, Electrical System. These percentages are based on the component field in owner complaints."

Q: "Is C1500 serious on my GMC SIERRA?"

"Of 3 NHTSA reports for this code on GMC SIERRA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my GMC SIERRA shows C1500?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What C1500 Means on Your GMC SIERRA

C1500 is a diagnostic trouble code indicating: Transfer Case Contact Plate "B" Encoder Circuit Failure. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 GMC SIERRA owners have reported this issue to NHTSA across model years 2006-2007. Most reports come from the 2006, 2007 model years. The most commonly reported component is Air Bags (66.7% of reports).

Real GMC SIERRA Owner Reports

Source: NHTSA Complaints Database

"In late october, 2013, i purchased my 2006 gmc sierra c1500 standard cab, 2wd pickup from a private owner. on or about, december 01, 2013, i noticed that the "service air bag" warning message appeared intermittently."

— 2006 GMC SIERRA owner · AIR BAGS · Filed 12/01/2013

"2006 gmc sierra c1500. consumer writes in regards to resistor and connector wiring replacement."

— 2006 GMC SIERRA owner · ELECTRICAL SYSTEM · Filed 08/01/2011

"2007 gmc new sierra c1500. consumer writes in regard to safety recall notice gm 49151 and nhtsa recall 16v-381(airbag inflator defective). consumer wonders when part will be made available."

— 2007 GMC SIERRA owner · AIR BAGS · Filed 07/01/2016

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

2

'06

1

'07

Common Causes on GMC SIERRA

Based on NHTSA complaint component analysis for this vehicle.

AIR BAGS 66.7%

ELECTRICAL SYSTEM 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does C1500 mean on a GMC SIERRA? ▾

C1500 indicates: Transfer Case Contact Plate "B" Encoder Circuit Failure. This is a chassis code. 3 GMC SIERRA owners have reported this to NHTSA.

What are the most common causes of C1500 on GMC SIERRA? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Air Bags, Electrical System. These percentages are based on the component field in owner complaints.

Is C1500 serious on my GMC SIERRA? ▾

Of 3 NHTSA reports for this code on GMC SIERRA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my GMC SIERRA shows C1500? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

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