Rick's Free Auto Repair Advice

P2135 Chevy

P2135 Chevy reduced engine power

GM has issued a service bulletin 11-06-04-007C to address a P2135 Chevy reduced engine power trouble in the vehicles listed below. code. A P2135 code is set if the PCM detects a difference between throttle position sensor 1 and throttle position sensor 2 and the difference lasts longer than 2 seconds. This is normally caused by a faulty electronic throttle body. However, in this case GM advises NOT to immediately replace the throttle body. The service bulletin lays out a very detailed method to recalibrate the throttle body which can save you a LOT of money. The bulletin is way too long and detailed to list here and it includes photos that I cannot legally reproduce. If you have this code and own one of the vehicles listed below, buy a short subscription to eautorepair.net or see if your local library offers access to manufacturers’ service bulletins.


The P2135 service bulletin applies to these vehicles:


2008-2011 Cadillac Escalade Models

2009-2011 Cadillac Escalade Two-Mode Hybrid

2008-2009 Chevrolet TrailBlazer

2008-2011 Chevrolet Avalanche, Colorado, Express, Silverado, Suburban, Tahoe

2008-2011 Chevrolet Tahoe Two-Mode Hybrid

2009-2011 Chevrolet Silverado Two-Mode Hybrid

2008-2009 GMC Envoy

2008-2011 GMC Canyon, Savana, Sierra, Sierra Denali, Yukon Models

2008-2011 GMC Yukon Two-Mode Hybrid

2009-2011 GMC Sierra Two-Mode Hybrid

2008-2009 HUMMER H2

2008-2010 HUMMER H3

Equipped with Engine RPO LFA, LY2, L20, LMG, LC9, LH6, LMF, LH8, LH9, L76, LS2, LY5, LY6, L92, L96, LZ1, L94 or L9H

Posted on by Rick Muscoplat

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