Chevrolet Suburban: Common Codes & Fixes

Real-world diagnostic data for the Chevrolet Suburban. These are the codes techs see most often. Tap any code for the full vehicle-specific fix and the exact part.

16 codes have specific fixes for the Chevrolet Suburban
B1000 GM B1000 codes point to a general body control module fault. 2007-2019 · easy (inspection), hard (BCM replacement) DIY · 30 min - 2 hours B1412 GM trucks set B1412 when the blend door actuator motor fails internally -- you'll often hear a ticking from the dash. 2007-2014 · Easy DIY · 30-60 min C0035 Same sensor as the trucks but the wiring harness routing is slightly different. 2007-2017 · easy DIY · 30 min - 1 hour C0040 Check the sensor connector and wiring harness first. 2007-2017 · easy DIY · 30 min - 1 hour C0045 Rear sensors on the Tahoe/Yukon are also in the axle housing. 2007-2017 · easy (sensor), hard (reluctor ring) DIY · 30 min (sensor), 3+ hours (reluctor ring) C0050 Right rear sensor replacement procedure is identical to the left. 2007-2017 · easy DIY · 30 min - 1 hour C0161 Tahoe/Suburban C0161 is the classic brake switch failure. 2000-2014 · easy DIY · 15-20 min C0265 Same EBCM failure as the trucks. 2007-2017 · hard DIY · 2-4 hours P0332 Bank 2 knock sensor low input on the older 5.3L/6.0L. 2004-2013 · Moderate DIY · 3-4 hours P0403 EGR valve wiring harness rubs against the intake manifold and shorts out. 2000-2006 · Moderate DIY · 1-2 hours P0406 On GM V8 engines, P0406 can be caused by a shorted EGR position sensor or carbon preventing the valve from fully closing. 2010-2020 · moderate DIY · 30-45 min P0411 Incorrect secondary air flow is almost always caused by rusted-shut check valves in the exhaust manifolds on GM trucks. 2003-2014 · Moderate DIY · 1.5-2 hours P0603 PCM KAM (keep-alive memory) error on GM trucks is typically caused by a weak battery or intermittent power loss to the PCM. 2003-2014 · Moderate DIY · 1-2 hours U0121 Same EBCM connector corrosion issue as the trucks. 2007-2017 · moderate DIY · 30 min - 2 hours U0155 GM full-size SUVs share the same IPC as the trucks. 2007-2017 · moderate DIY · 1-2 hours U0401 On GM SUVs, U0401 can appear after installing a tuner or performance programmer that modifies PCM data. 2007-2017 · moderate DIY · 30 min - 2 hours

Frequently Asked Questions

What are the most common check engine light codes on a Chevrolet Suburban?

The most commonly reported OBD-II codes for the Chevrolet Suburban include B1000, B1412, C0035, C0040, C0045. Each code indicates a specific issue -- tap any code above for the full diagnostic breakdown.

How much does it cost to fix a check engine light on a Chevrolet Suburban?

Repair costs vary by code. Many Chevrolet Suburban fixes like gas cap replacement, sensor cleaning, or spark plug changes are under $50 in parts and can be done at home. More complex repairs like catalytic converter or transmission work can run $500-$2,000+ at a shop.

Can I drive my Chevrolet Suburban with the check engine light on?

It depends on the code. A steady check engine light usually means you can drive short distances safely. A flashing check engine light means stop driving immediately -- continued driving can cause serious engine damage. Scan the code first to know what you are dealing with.

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