P0877 Diagnostic Trouble Code Discussion for January 2025
Pressure Control Solenoid 4 Circuit Low
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| Help Request | Posted | |
| 2011 GMC Sierra 1500 SLT 5.3L Excessive Emissions, Poor Idle Quality, Runs rich until full VIN: 3GTP2WE38B P0877: TFP switch 4 low voltage. 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... |
January 22, 2025 |
