Exhaust Charge DTC Diagnostics

Some 2019-2021 Silverado, Sierra; 2021 Tahoe, Suburban, Yukon, and Escalade models equipped with the 5.3L engine (RPO L84) or 6.2L engine (RPO L87) (Fig. 19) may have any of the following DTCs set:

  • DTC P3189 – Cylinder 1 Trapped High Pressure Exhaust Charge
  • DTC P318A – Cylinder 2 Trapped High Pressure Exhaust Charge
  • DTC P318B – Cylinder 3 Trapped High Pressure Exhaust Charge
  • DTC P318C – Cylinder 4 Trapped High Pressure Exhaust Charge
  • DTC P318D – Cylinder 5 Trapped High Pressure Exhaust Charge
  • DTC P318E – Cylinder 6 Trapped High Pressure Exhaust Charge
  • DTC P318F – Cylinder 7 Trapped High Pressure Exhaust Charge
  • DTC P3190 – Cylinder 8 Trapped High Pressure Exhaust Charge

 

Fig. 19

 

In the cylinder deactivation system, the intake and exhaust lifters are disabled consecutively so that a low pressure charge is trapped in the cylinder. In the event of a mechanical failure with the valvetrain, a high pressure charge can be trapped in the cylinder, which causes a DTC to set.

When reviewing the Service Information for these DTCs, it may be difficult to isolate the concern with the correct cylinder. The concern may be caused by a cylinder on the opposite bank from the location of the DTC.

Inspect the other side of the engine bank for any valvetrain concerns associated with these DTCs.

 

– Thanks to Richard Renshaw

Knock Sensor Inspection
Transmission Shift Conditions

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