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2011 GMC Sierra 1500 SLT 5.3L Excessive Emissions, Poor Idle Quality, Runs rich until full
Posted to GM Driveability on 1/22/2025 13 Replies

Vehicle runs excessively rich when cold. Fuel trims as high as plus 29 percent long term and plus 30 percent short term. Mass air running around 14 g/s and calculated air flow around 24 g/s Sometimes it will not idle down running up to around 3000 rpm. IAT...

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car Vehicle Data

2011 GMC Sierra 1500 SLT

VIN 3GTP2WE38B
Engine5.3 L / 8 cyl / FLEX
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Runs Rich Until Full
OccursCold, Idle
Misc.Flex Fuel

Trouble Codes

P0106Manifold Air Pressure Sensor Range/Performance
P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
P0336CKP Sensor 1 Circuit Intermittent Signal
P0463Fuel Level Sensor Circuit High Voltage
P0877Transmission Fluid Pressure Switch 4 Circuit Low Voltage
Open Help Request

car Vehicle Data

2011 GMC Sierra 1500 SLT

VIN 3GTP2WE38B
Engine5.3 L / 8 cyl / FLEX
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, Runs Rich Until Full
OccursCold, Idle
Misc.Flex Fuel

Trouble Codes

P0106Manifold Air Pressure Sensor Range/Performance
P0171Fuel System Too Lean (Bank 1)
P0174Fuel System Too Lean (Bank 2)
P0336CKP Sensor 1 Circuit Intermittent Signal
P0463Fuel Level Sensor Circuit High Voltage
P0877Transmission Fluid Pressure Switch 4 Circuit Low Voltage