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Service Information 2008 GMC Truck Yukon Denali | Avalanche, Escalade, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | Document ID: 2085901
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#PIP4286B: Cold Start P1400 - keywords 6.2 DTC emission engine idle ignition L92 MIL RPM SES startup - (Mar 25, 2008)
Subject: Cold Start P1400
Models: 2008 Cadillac Escalade
2008 GMC Yukon
2008 Hummer H2
Equipped with the 6.2L L92 engine.
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This PI was superseded to was superseded to include a clean date in which vehicles already had the updated calibration. Please discard
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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A dealer may encounter a customer concern of SES light and DTC P1400 after a cold start.
Recommendation/Instructions:
DTC P1400 may be setting on low mileage vehicles. Per SI diagnostics P1400 can be induced by any loading of the engine that lowers engine RPM.
There has been a new calibration released to address DTC P1400. Reprogram the ECM and evaluate repairs.
The P1400 calibration was put into production so only the vehicles built before a specific date will benefit from this update.
For Arlington built vehicles (Use 11th digit of VIN number to identify plant of origin, on Arlington built vehicles the 11th digit is an R) the calibration is only necessary for vehicles built before 12/12/2007.
All other vehicles (plants) referenced in this PI received the calibration on 11/30/2007.
If a dealer was to encounter a P1400 after a updated calibration has been installed, complete the current SI diagnostic, make repairs as necessary, and complete a Field Product Report using the newest version of bulletin number 02-00-89-002.
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.
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