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P207F GMC - Reductant Quality Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Degraded, Diluted or Incorrect Diesel Exhaust Fluid
  • Exhaust System leak
  • Diesel Exhaust Fluid Deposit in Def Injector Decomp Tube
  • Defective SCR Catalyst
  • Tech notes

    There is a factory service bulletin for the following GMC models:
    2010 GMC Savana
    2011 GMC Savana
    2011 GMC Sierra
    GMC Factory Service Bulletin OBDII Code P207F

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P207f Gmc Description

    The aftertreatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1/1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1/2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module assemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after the monitor runs and passes.

    OBDII Code P207f Gmc - Reductant Quality Performance - Autoodes.com

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    Repair Importance Level: 3
     
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    Repair Difficulty Level: 3
     
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