Document ID: This PI was superseded to change labor operation time from.4 to.5. Please discard PIP4307G.

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Barbara Golden
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1 Page 1 of GMC Truck GMC K Sierra - 4WD Sierra, Silverado (VIN C/K) Service Manual Driveline/Axle Rear Drive Axle #PIP4307H: MAP sensor Icing Or P keywords L absolute air DTC engine freeze ice inlet intake LBZ LLY LMM manifold mode power reduce reduced restricted restriction sensor SES tube water wet - (Mar 12, 2009) Subject: Models: MAP Sensor Icing or P Chevrolet Silverado Classic GMC Sierra Classic Chevrolet Silverado GMC Sierra with 6.6L Diesel Engine (RPOs LBZ, LLY, or LMM) This PI was superseded to change labor operation time from.4 to.5. Please discard PIP4307G. 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 reduced engine power, SES light, or P0106. The P0106 may be the result of condensation that has frozen inside of the MAP sensor. The P0106 will only occur in areas with ambient temperatures at or below freezing for a long period of time. Recommendation/Instructions: If there is a DTC P0106 set inspect the MAP sensor inlet. If there is condensation, water, or an oily substance in the MAP sensor inlet, a modification to the MAP sensor inlet will be necessary. This repair will extend the MAP sensor inlet farther into the air intake tube. This photo is of a complete retrofitted MAP sensor, and the original MAP sensor.

Page 2 of 5 MAP Sensor Retrofit Instructions Remove the MAP sensor, clean the MAP sensor with soap and water (certain cleaners may damage the sensor), and make sure it is completely dry.

2 Page 2 of 5 MAP Sensor Retrofit Instructions Remove the MAP sensor, clean the MAP sensor with soap and water (certain cleaners may damage the sensor), and make sure it is completely dry. A MAP sensor extension will need to be fabricated (see photo below). A 1.5 inch (38 m/m) length of 3/8 inch (9.5 m/m) steel brake line (or fuel line) tubing will be used for the MAP sensor extension. One end of the brake line will need to be flared, and the other end will be cut at a 30 to 45 degree angle. The flare on the pipe will ensure the pipe cannot fall into air intake. The angled cut on the inlet side of the pipe will help keep the sensor from freezing and skewing MAP sensor readings. Cut and flare the pipe using Kent Moore brake line repair kit J45405 or equivalent.

This step will show how to affix the pipe to the sensor. It's IMPERATIVE the pipe is oriented correctly before it is glued.

3 Page 3 of 5 Remove the MAP sensor to intake pipe rubber seal. This seal will be modified to fit with new MAP sensor extension. Using a suitable tool, cut the seal leaving two or three ribs, and the beveled end of seal (inboard side of seal) intact. The inboard piece of this seal will be reused. This step will show how to affix the pipe to the sensor. It's IMPERATIVE the pipe is oriented correctly before it is glued. The open side of the angle needs to face away from the air flow (the open side of the angle towards rear of vehicle, see first photo with completed sensor) With the map sensor laying flat, put a coating of two part epoxy (Loctite part number LT or equivalent) around the map sensor port (barb fitting). Laying the sensor flat will ensure no epoxy enters the MAP sensor port. Clean off any excess epoxy.

4 Page 4 of 5 Reinstall inboard portion of MAP sensor seal (modified in step 2) after the epoxy has dried.

Page 5 of 5 Install the new retrofitted MAP sensor on the vehicle. Test drive the vehicle to check for sensor leaks and proper MAP sensor operation. Return the vehicle to the customer for evaluation.

5 Page 5 of 5 Install the new retrofitted MAP sensor on the vehicle. Test drive the vehicle to check for sensor leaks and proper MAP sensor operation. Return the vehicle to the customer for evaluation. Note: If the vehicle has experienced snow ingestion into the air cleaner please see the newest version of bulletin (for vehicles) or PI number PIP4545 (for vehicles). Warranty Information- For vehicles repaired under warranty use: Labor Operation Description Intake Manifold Tube Replacement Labor Operation J0153* Labor Time 0.5 hr * This labor operation number is for PI/bulletin use only. This number will not be published in the Labor Time Guide. 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 knowhow 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION 2010 General Motors. All rights reserved.

#PIP4949E: Duramax Diesel Hard Start No Start P0087 P0088 P0191 P128E Or Injection Pump Replacement - (Jun 8, 2015)

Page 1 of 5 Document ID: 4211994 #PIP4949E: Duramax Diesel Hard Start No Start P0087 P0088 P0191 P128E Or Injection Pump Replacement - (Jun 8, 2015) Subject: Duramax Diesel Hard Start No Start P0087 P0088