This VIN in the bad zone?
Super Moderator
Joined: Jul 2007
Posts: 13,090
From: Boat Town USA MI
From an old post of mine back in August 2009... that would make it a yes to your question.
"The S/Ns affected is any 2006 H3 lower than 287591 .... the first one started with 100,001, your truck build date will be Nov. 06 or earlier. Not all have the problem, but some could. The head issue affected not only the I5, 4s and 6s were subject to the same issues. Call GM with your vin# and build date (from the sticker in the driver's door jam) and ask.
Just in case you're gonna say, wow they didn't even build that many 3s? The VINs are assigned at the same Shreveport plant building Colorados and Canyons. Their VIN sequence unit #s are mixed in and subject to the same TSB re: the head/valve issue.
The recall and extended warranty was for very early 2006s, those with the 3.5L L52 Motors built before March 31, 2006. That is not to say some 3.7L LLRs have never had a valve or head issue. All the Atlas motors built since 4/1/06 have the new hardened valve seats."
"The S/Ns affected is any 2006 H3 lower than 287591 .... the first one started with 100,001, your truck build date will be Nov. 06 or earlier. Not all have the problem, but some could. The head issue affected not only the I5, 4s and 6s were subject to the same issues. Call GM with your vin# and build date (from the sticker in the driver's door jam) and ask.
Just in case you're gonna say, wow they didn't even build that many 3s? The VINs are assigned at the same Shreveport plant building Colorados and Canyons. Their VIN sequence unit #s are mixed in and subject to the same TSB re: the head/valve issue.
The recall and extended warranty was for very early 2006s, those with the 3.5L L52 Motors built before March 31, 2006. That is not to say some 3.7L LLRs have never had a valve or head issue. All the Atlas motors built since 4/1/06 have the new hardened valve seats."
Senior Member
Joined: Jul 2012
Posts: 8,999
From: C-Town
#PIP3935D: Misfire At Idle Due To Leaking Intake Valves - Supplement To 07-06-01-011 - keywords 2.8L 3.5L compression controls cylinder driveability DTC engine excessive head high L52 LK5 leakage leakdown low - (Mar 18, 2008)
Subject: Misfire at Idle due to Leaking Intake Valves - Supplement to 07-06-01-011
Models: 2004-2005 Chevrolet Colorado, GMC Canyon
2006 Chevrolet Colorado, GMC Canyon
and Last 6 of VIN Less than 287698
2006 Hummer H3
and Last 6 of VIN Less than 287591
This PI was superseded to update model years and engines, and to revise the repair recommendations. Please discard PIP3935C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
On rare occasions, a SES light and P0300 may be experienced due to a single cylinder misfire at idle that may or may not be felt. This may occur before the VIN breakpoints above due to non-uniform intake valve seat wear, which may prevent the intake valve from sealing properly. Vehicles built after these VIN breakpoints contain harder intake valve seats to address this concern. If the engine misfires occur off of idle, this PI does not apply. Bulletin 07-06-01-011 contains a labor operation and related tips for performing a cylinder leakage test to diagnose this concern but it does not indicate what repairs should be performed if a leaking intake valve is found.
Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for this concern, refer to the latest version of 07-06-01-011 and the "Cylinder Leakage Test" procedure in SI to perform a cylinder leakage test. If a leaking intake valve is found, replace the cylinder head by following the latest version of 06-06-01-017, which contains the necessary replacement procedure and part numbers. If the vehicle is a 2006 model, install the latest PCM calibrations to complete the repair. The cylinder head received from GMSPO contains harder intake valve seats to address this concern.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
Thread Starter
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Junior Member
Joined: Mar 2021
Posts: 14
2007 HUMMER H3 4WD 4dr SUV $15,997
#PIP3935D: Misfire At Idle Due To Leaking Intake Valves - Supplement To 07-06-01-011 - keywords 2.8L 3.5L compression controls cylinder driveability DTC engine excessive head high L52 LK5 leakage leakdown low - (Mar 18, 2008)
Subject: Misfire at Idle due to Leaking Intake Valves - Supplement to 07-06-01-011
Models: 2004-2005 Chevrolet Colorado, GMC Canyon
2006 Chevrolet Colorado, GMC Canyon
and Last 6 of VIN Less than 287698
2006 Hummer H3
and Last 6 of VIN Less than 287591
This PI was superseded to update model years and engines, and to revise the repair recommendations. Please discard PIP3935C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
On rare occasions, a SES light and P0300 may be experienced due to a single cylinder misfire at idle that may or may not be felt. This may occur before the VIN breakpoints above due to non-uniform intake valve seat wear, which may prevent the intake valve from sealing properly. Vehicles built after these VIN breakpoints contain harder intake valve seats to address this concern. If the engine misfires occur off of idle, this PI does not apply. Bulletin 07-06-01-011 contains a labor operation and related tips for performing a cylinder leakage test to diagnose this concern but it does not indicate what repairs should be performed if a leaking intake valve is found.
Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for this concern, refer to the latest version of 07-06-01-011 and the "Cylinder Leakage Test" procedure in SI to perform a cylinder leakage test. If a leaking intake valve is found, replace the cylinder head by following the latest version of 06-06-01-017, which contains the necessary replacement procedure and part numbers. If the vehicle is a 2006 model, install the latest PCM calibrations to complete the repair. The cylinder head received from GMSPO contains harder intake valve seats to address this concern.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
#PIP3935D: Misfire At Idle Due To Leaking Intake Valves - Supplement To 07-06-01-011 - keywords 2.8L 3.5L compression controls cylinder driveability DTC engine excessive head high L52 LK5 leakage leakdown low - (Mar 18, 2008)
Subject: Misfire at Idle due to Leaking Intake Valves - Supplement to 07-06-01-011
Models: 2004-2005 Chevrolet Colorado, GMC Canyon
2006 Chevrolet Colorado, GMC Canyon
and Last 6 of VIN Less than 287698
2006 Hummer H3
and Last 6 of VIN Less than 287591
This PI was superseded to update model years and engines, and to revise the repair recommendations. Please discard PIP3935C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
On rare occasions, a SES light and P0300 may be experienced due to a single cylinder misfire at idle that may or may not be felt. This may occur before the VIN breakpoints above due to non-uniform intake valve seat wear, which may prevent the intake valve from sealing properly. Vehicles built after these VIN breakpoints contain harder intake valve seats to address this concern. If the engine misfires occur off of idle, this PI does not apply. Bulletin 07-06-01-011 contains a labor operation and related tips for performing a cylinder leakage test to diagnose this concern but it does not indicate what repairs should be performed if a leaking intake valve is found.
Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for this concern, refer to the latest version of 07-06-01-011 and the "Cylinder Leakage Test" procedure in SI to perform a cylinder leakage test. If a leaking intake valve is found, replace the cylinder head by following the latest version of 06-06-01-017, which contains the necessary replacement procedure and part numbers. If the vehicle is a 2006 model, install the latest PCM calibrations to complete the repair. The cylinder head received from GMSPO contains harder intake valve seats to address this concern.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
great - thanks a lot, I appreciate it.
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