GMC Yukon XL 2000–2006

▸Known issuesIntake manifold gasket leak (cold idle misfire, lean codes)1

1. Manufacturer communication2002–2004 GMC YUKON XL ・ 2006-04-01(also printed in 8 other issues)

   Rough idle, misfire, MIL with DTC P0300: intake manifold warpage and upper manifold gasket

   1. 1Fault

      • Warning light
      • P0300
      • The condition is rough idle, misfire and MIL with DTC P0300.
      ↓→

   2. 2Finding the cause

      Steps to confirm (in the document’s order)

      • Measure the intake manifold for warpage across two runner ports only.
      ↓→

   3. 3Correction

      Repair

      1. Replace the upper manifold gasket with the teal-green gasket.
      2. The reference given for this row is 05-06-04-029.

      Caution

      • Do not measure the intake manifold across all four intake runner ports.
      • Do not replace the upper intake manifold gasket with an orange gasket.
   Read the sentences of the record

   From the manufacturer’s document

   • Applies to：The row is for 2002-2004 Silverado, Suburban, Tahoe, Sierra, Yukon/XL and Escalade EXT with rough idle, misfire and MIL with DTC P0300.
   • Condition：The condition is rough idle, misfire and MIL with DTC P0300.
   • Confirm：Measure the intake manifold for warpage across two runner ports only.
   • Repair：Replace the upper manifold gasket with the teal-green gasket.
   • Caution：Do not measure the intake manifold across all four intake runner ports.
   • Caution：Do not replace the upper intake manifold gasket with an orange gasket.
   • Repair：The reference given for this row is 05-06-04-029.

   Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.

   Remedy

   Truck Issues — Fix It Right the First Time 2002-2004 Silverado, Suburban, Tahoe, Sierra, Yukon/XL, Escalade EXT – Rough Idle, Misfire, MIL DTC P0300 Silverado, Suburban, Tahoe, Sierra, Yukon/XL, Escalade EXT – Rough Idle, Misfire, MIL DTC P0300 Measure intake manifold for warpage across two runner ports only. Replace upper manifold gasket with teal-green gasket. Don’t measure intake manifold across all four intake runner ports. Don’t replace upper intake manifold gasket with orange gasket. Don’t replace upper intake manifold gasket with orange gasket. 05-06-04-029