PIT5212

Service Bulletin Details

Public Details for: PIT5212

This preliminary information communication provides information to the technician about vehicles with a service engine soon malfunction indicator lamp on. Technician will find a diagnostic trouble code P2636 set. Technician will find that u


- 2013 -

Models from 2013
2013 CHEVROLET SILVERADO 2500
2013 CHEVROLET SILVERADO 3500
2013 GMC SIERRA 2500
2013 GMC SIERRA DENALI 
Bulletin No.: PIT5212
Date: Jul-2013
Subject:
Diagnostic Tip - SES MIL DTC P2636 Unable To Command Transfer Pump On With Scan Tool
Models:
2013 Chevrolet Silverado 3500 Chassis Cab w/ Dual Fuel Tanks
2013 GMC Sierra 3500 Chassis Cab w/ Dual Fuel Tanks
with 6.6L Diesel Engine (RPO LML, LMM)
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
One or several of the following conditions may be present:
•
SES MIL with DTC P2636 set
•
Technician unable to command the fuel system transfer pump "On" with the scan tool
Recommendation/Instructions
Note: Perform the following BEFORE performing any repairs or replacing any parts.
At this time there is a software issue with this function and this may lead to unnecessary replacement of the ECM.
Until this issue is resolved, follow this path to attempt to command the transfer pump:
(C) 2012 > LD Trk, MPV , Incomplete > Chevrolet Truck or GMC Truck > C or K > Silverado of Sierra > F0: Powertrain > (L) 6.6L LGH Diesel or (8) 6.6L LML
Diesel > F0: Engine Control Module > F2 Special Functions > F2: Fuel System > F4: Fuel Transfer Pump.
Continue with published diagnostics from that point.
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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