Electrical System Failures

Complaints frequently cite electrical system issues, including power loss and potential fires. This can stem from wiring harness problems or component failures. Estimated repair cost: $200 - $1,500+.

Engine complaints include vibration and, critically, fuel injection pump failures that can lead to loss of power steering and brakes. The 6.2L V8 is generally robust, but these specific issues require attention. Estimated repair cost: $500 - $4,000+.

Structure: Body Issues

Body structure complaints, including dashboard cracking, are noted. This can affect interior aesthetics and potentially interfere with airbag systems. Estimated repair cost: $300 - $1,000+.

Airbag system issues, including erroneous deployment or dashboard cracking near airbag housings, present a significant safety concern. Estimated repair cost: $500 - $2,000+.

Steering complaints, including loss of power steering, are linked to engine and fuel system issues. Early-life failures in steering components can also occur. Estimated repair cost: $400 - $1,200.

CARFOCALvehicle research

2012 GMC Sierra Maintenance guide

Name: Maintenance dataset for 2012 GMC Sierra
Creator: Carfocal

v1.0Updated May 30, 2026Ethan Miller4 Sources Analyzed1 Critical Recalls

MAINTENANCE SUMMARY

The 2012 GMC Sierra requires diligent maintenance, with a notable emphasis on its electrical system, engine, and structural integrity due to frequent complaints. Owners should be aware of potential issues like fires stemming from electrical faults and loss of critical controls from fuel injection pump failures.

View Critical Issue: Engine Issues

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Reliability Score

Est. Annual Maintenance Cost

$500 - $1,000

TSBs & Recalls

273 TSBs | 2 Recalls

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Key Takeaways

Prioritize inspection and maintenance of the electrical system due to frequent complaints and fire risk.
Be vigilant for engine issues, especially fuel injection pump failures that impact critical control systems.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance