C1500 on Gmc Sierra
Transfer Case Contact Plate "B" Encoder Circuit Failure
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Gmc Sierra context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for C1500.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
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.
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 c1500. consumer writes in regards to resistor and connector wiring replacement."
"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."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Gmc Sierra
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.