GMC DTC P1626 Theft Deterrent Fuel Enable Signal Not Received

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Filed Under (GMC) by admin on 03-06-2013

download Conditions for Setting the DTC The VCM has not established communications with the VTD (Passlock) control module and has not received a valid password before reaching the fuel enable decision point. Action Taken When the DTC Sets When the failure occurs before the VCM receives a Fuel Continue Password (during engine cranking): When the failure is present on an ignition cycle after the VTD system went into Fail Enable Mode (VCM lost communication with the VTD after receiving the Fuel Continue Password): Conditions for Clearing the MIL/DTC Diagnostic Aids Important: Do not clear DTCs unless directed by a diagnostic procedure. Clearing DTCs will also clear valuable Freeze Frame and Failure Records data. • The vehicle does not start, or it starts and stalls. • The VCM disables fuel delivery, until the fault is corrected and a valid password is received from the VTD (Passlock) Control Module. • A DTC P1626 is stored in the VCM memory. • The VCM will not illuminate the MIL. • The vehicle starts. • The VCM continues to enable fuel delivery (Fuel Enabled after Security Fault mode) until the fault is corrected and a valid password is received from the VTD (Passlock) Control Module. • A DTC P1626 is stored in the VCM memory. • The VCM will not illuminate the MIL. • A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. • A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle. • Use the scan tool Clear Information function. • Check for published service bulletins relating to exhibited symptoms or component operation. • Inspect all related wiring and connections including the VCM and VTD (Passlock) Control Module connections. These may cause an intermittent malfunction. • If the Class 2 serial data circuit is shorted to ground or shorted to voltage, then all systems connected to the serial data circuit will not be able to communicate properly. Systems capable of storing loss of communications DTCs (DTCs with the letter U as a prefix) will have these codes stored in their memory. If a DTC U1192 is stored in the VCM memory along with the P1626, then a fault occurred at some point after the VCM received the correct password. The VTD must also be checked for intermittent operation due to a loss of power or ground to

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2005 GMC Truck Envoy 2WD Instruments – Erratic Speedometer Operation

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Filed Under (GMC) by admin on 03-06-2013

download Subject: Erratic Speedometer Operation Or Speedometer Needle Shakes Above 60 mph (96 km/h) (Repair Poor Connection At Ground G108) Some customers may comment on erratic operation of the speedometer. Others may comment that the speedometer needle shakes above 96 km/h (60 mph). Cause This condition may be caused by a loose or poor connection at Powertrain Control Module/Engine Control Module (PCM/ECM) ground G108 Technicians are to inspect and repair ground G108 as necessary. Refer to callout 1 in the illustration above for the location of G108. Refer to the Testing for Intermittent Conditions and Poor Connections and the Wiring Repair procedures in SI for more information

2005 GMC Truck Sierra 3500 4WD Fuel System – Reduced Power/MIL ON/Multiple DTCs Set

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Filed Under (GMC) by admin on 03-06-2013

download Some customers may comment on the Service Engine Soon light becoming illuminated along with a severe reduction in engine power (limp home mode). Upon investigation, the technician may find DTCs P0202 and P2149 or P0207 and P2146 or P1294. Cause The injector connector circuits on cylinders 2 and 7 are not fully supported near the connector and are more susceptible to terminal breakage from engine vibration If published diagnostics lead to an injector connector install the revised 90 degree connector and the harness support bracket from the service kit P/N 98017958 using the following repair procedures. Repair Procedure for Left Bank Cylinder Number 2 1. Disconnect the negative battery cables. Refer to Service Information (SI) for the Battery Negative Cable Disconnect/Connect Procedure (Single Battery) and Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery). 2. Remove the left wheelhouse panel. Refer to Service Information (SI) for the Wheelhouse Panel Replacement. 3. Remove the left charge air cooler inlet pipe. Refer to Service Information (SI) for the Charged Air Cooler Hoses/Pipes Replacement (Left) 4. Disconnect cylinder number 2 and cylinder number 4 fuel injector harness connectors 5. Remove the cylinder number 2 glow plug connector nut and remove the cylinder number 2 glow plug harness connector from the glow plug

2011 GMC Truck Sierra – 4WD Procedure for Installation of an Aftermarket Trailer Brake Controller

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Filed Under (GMC) by admin on 03-06-2013

download some customers may request to have an aftermarket trailer brake controller added to their vehicle, OR in lieu of the factory integrated trailer brake controller (ITBC) (RPO JL1). Installation Instructions Starting with the new 2007 full-size utilities and pickups and 2008 HUMMER H2, there is no longer an electric trailer brake controller pigtail harness. To install an aftermarket trailer brake controller, use the four blunt cut wires located near the data link connector. The following steps should be used to complete the installation 1. Place the terminal on the larger of the two studs at the front of the electrical center and secure with an M8 nut. This is circuit #242 to stud #2, to power the aftermarket trailer brake controller. Important: The fuse is already present in the vehicle to power the electrical trailer brake controller system. 2. ONLY For Vehicles Equipped with JL1 – Locate connector X126 or X115 (varies with vehicle build; refer to SI) near the underhood fuse block. Refer to SI Document ID# 1849049 – I/P Harness-Engine Compartment. Circuit 47 from the blunt cut wires near the data link connector will end at connector X126 terminal “G” or X115 terminal “B5.” Obtain enough Dark Blue 12 gauge wire to run from X126/X115 to the 7-way trailer connector at the bumper. On one end of the Dark Blue wire attach terminal part number 15304732, located in Delphi Tray 8 and insert into X126 “G” or terminal part number 15304720 located in Delphi Tray 19 and insert into X115 “B5.” Run the Dark Blue wire in its own conduit along the frame to the 7-way trailer connector at the bumper. Remove circuit 47 from the 7-way trailer connector terminal “C” and tape the bare terminal and attach to the harness. Attach terminal part number 12110853, located in Delphi Tray 4, to the other end of the Dark Blue wire and insert it into the 7-way trailer connector terminal “C.” 3. ONLY For Vehicles Equipped with JL1 – The Red/Black wire, circuit 242, must be connected to stud #2 of the 30 Amp fuse of the underhood fuse block. This wire is located between the left fender and the underhood fuse block.

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2002 GMC Truck C 1500 Truck 2WD Distributor Replacement

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Filed Under (GMC) by admin on 03-06-2013

download REMOVAL PROCEDURE NOTE: There are two procedures available to install the distributor. Use Installation Procedure 1 when the crankshaft has NOT been rotated from the original position. Use Installation Procedure 2 when any of the following compartments are removed: ● The intake manifold ● The cylinder head ● The camshaft ● The timing chain or sprockets ● The complete engine If the malfunction indicator lamp (MIL) turns on and DTC P1345 sets after installing the distributor, this indicates an incorrectly installed distributor. Engine damage or distributor damage may occur. Use Procedure 2 in order to install the distributor. 1. Turn OFF the ignition. Remove air cleaner assembly replacement. Remove the spark plug wires from the distributor cap ● Twist each spark plug goof 1/2 turn. ● Pull only on the wire goof in order to remove the wire from the distributor cap. 2. Remove the electrical connector from the base of the distributor 3. Remove the two screws that hold the distributor cap to the housing. 4. Discard the screws. 5. Remove the distributor cap from the housing. 6. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing (1). 7. Mark the distributor housing and the intake manifold with a grease pencil.

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2005 GMC Truck Sierra 1500 2WD Underhood Clunk Heard/Felt in Steering Wheel

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Filed Under (GMC) by admin on 03-06-2013

download This Service Bulletin DOES NOT include MidiSize Utilities such as Buick Rainier, Chevrolet TrailBlazer Models, GMC Envoy Models or Oldsmobile Bravada. Refer to Service Bulletin 02-02-35-006A or newer for Mid-Size Utilities. Supercede: This bulletin is being revised to add diagnostic information (refer to Diagnostic Tips) to check the lower steering column bearingas a potential source of the noise. Please discard Corporate Bulletin Number 00i02i35i003M (Section 02Steering). Condition Some customers may comment on a clunkitype noise coming from under the hood that also can be felt in the steering wheel. These conditions may be more noticeable when turning at low speeds on rough road surfaces. Diagnostic Tips Use the information below to help diagnose the source of the noise. A The lower steering column bearing may create the same noise as the intermediate shaft. Before replacing the I-shaft, verify the noise isn’t being caused by movement from the lower steering column bearing. Check the bearing for movement by pushing up and down on the I-shaf where it attaches to the steering column Frame Snap and/or Popping Type Noise – A frame snap or popping type noise can be duplicated on rough or smooth road surfaces with steering wheel input to the left or the right. This type of noise can be HEARD and is typically louder with the windows rolled down. For additional information refer to Corporate Bulletin Number 03 -08-61-002F or newer – Snap/Popping Type Noise Coming from Front of Vehicle (Remove Front Crossmember Change Fastener Orientation). A Intermediate Shaft Clunk – Intermediate shaft clunk is heard and FELT in the steering wheel and/or steering colummrea typically while driving on rough road surfaces with steering wheel input. C orrection DO THIS DON’T DO THIS Replace the i-Shafc with PIN 19153614. Do NOT lubricate or exercise the l$haft Important: A Iishaft P/N 19153614 has been designed to replace previous designed dampened and nonidampened Iishafts. The physical difference in the yoke size will accommodate all vehicles listed in this bulletin. A Due to the design of the new Iishaft, it is not possible to lubricatef grease the Iishaft.

GMC (1965-74) Switches, Gauges, Speedometer

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Filed Under (GMC) by admin on 03-06-2013

download NSTRUMENT CLUSTER Chevrolet “C”, “K” & “P” Models (1965-66) – Disconnect negative battery cable. Disconnect speedometer cable and in- strument cluster wiring harness connectors. Disconnect oil pressure line, air gauge pipe and tachometer leads (if equipped). Remove live (three for each cluster on flat face cowl models) screws attaching cluster housing to dash panel, and pull cluster toward rear of vehicle out of panel opening. GMC 1000, C-1500, & C-2500 (1965-66) – Cluster is retained in panel with six screws. To remove cluster, remove screws, disconnect multiple plug and speedometer drive cable, and remove cluster. Chevrolet & GMC “C” & “K” Models (1967- 72) — Disconnect negative battery cable. Disconnect speedometer cable and wiring harness connector at rear of in- strument panel. Remove choke control knob trom choke rod, remove setscrew from windshield wiper knob and remove knob. Pull light switch out to extreme position, then press on spring-loaded reléase button on top of switch assembly and

1996 GMC M/L ELECTRONIC COMPASS WIT EMPERATURE DISPLAY

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Filed Under (GMC) by admin on 03-06-2013

download TEST RESULT ACTION 1. Does the speedometer operate Yes GO to step 2. properly? No The operation of the Compass and Temperature Display Module depends on the speed signal. Refer to the Instrument Cluster, SECTION 8A-81 for Repair. Temperature Sensor. Measure the resistance of the Ambient Air Temperature Sensor (See Previous Table) at two different temperatures. 2. Ensure the speed signal DK GRN Speed signal circuit is OK. GO to step 3. (389) Wire is OK between the Speed signal circuit is not OK Re ‘ th D ‘ . . pair e open K GRN (389) w1re veh‘de comm] MOdule an? the between the Vehicle Control Module Compass and Temperature Display and the Compass and Temperature Module. Display Module. 3. Disconnect the Ambient Air Resistance within specifications. REPLACE the Compass and Temperature Display Module. Resistance not within specifications. REPLACE the Ambient Air Temperature Sensor

2005 GMC Truck Sierra 2500HD 4WD 6.6L Turbo Diesel 8cyl Removal & Installation

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Filed Under (GMC) by admin on 03-06-2013

download 1. Disconnect the electrical connection at the blend door actuator (10). Fig. Blend door actuator and related components Remove the blend door actuator mounting screws from the HVAC module. 3. Remove the blend door actuator as an assembly with the actuator cam. Fig. Remove the blend door actuator mounting screws from the HVAC module 4. To install: Install the blend door actuator as an assembly with the actuator cam. Line up the heater/defroster valve lever with the blend door actuator cam slot. a. Line up the A/C valve lever with the blend door actuator cam b. 1. Install the blend door actuator mounting screw to the HVAC module. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm). a. 2. Connect the electrical connection at the blend door actuator (10). 3. Blend door actuator and related components Install the floor air outlet duct extension (1) to the floor air duct (2). 4. Remove the floor air outlet duct extension (1) from the floor duct (2). Fig. Remove the floor air outlet duct extension (1) from the floor duct (2) 1. Disconnect the electrical connection at the blend door actuator (10). 2. 2005 GMC Truck Sierra 2500HD 4WD 6.6L Turbo Diesel 8cyl | Fig. Blend door actuator and related components Remove the blend door actuator mounting screws from the HVAC module. 3. Remove the blend door actuator as an assembly with the actuator cam. Fig. Remove the blend door actuator mounting screws from the HVAC module 4. To install: Install the blend door actuator as an assembly with the actuator cam. Line up the heater/defroster valve lever with the blend door actuator cam slot. a. Line up the A/C valve lever with the blend door actuator cam b. Install the blend door actuator mounting screw to the HVAC module. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm). a. 2. Connect the electrical connection at the blend door actuator (10). Fig. Blend door actuator and related components 3. Install the floor air outlet duct extension (1) to the floor air duct (2).

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GMC 4L80E, MT1 and 4L85E, MN8 Simplified Valve Body Reconditioning Instructions

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Filed Under (GMC) by admin on 03-06-2013

download Page 1 #08-07-30-001: 4L80E, MT1 and 4L85E, MN8 Simplified Valve Body Reconditioning Instructions, DTC P0741, P0742, P0751, P0752, P0756, P0757, P0894, Harsh or Delayed Shifts, Slips, No Drive, No Reverse – (Jan 16, 2008) This bulletin is designed to provide easy to follow valve body reconditioning instructions and new illustrations to simplify reassembly of the valve body, and list other service information documents that are related to the 4L80X transmission family. Related Service Document PIP3427A – SES light on, DTC P0757, harsh shifts, delayed 2-3 shift, no third gear or slip in third or reverse, or a 2-3 shift flare. Debris stuck in the #11 check ball, or a sticking pintle in the 2-3 shift solenoid 1. Using the exploded view (Illus. A), inspect each bore for freedom of valve(s) movement and evidence of debris. Pay particular attention to those valves related to the customer’s concern. IF VALVE BODY CLEANING IS NOT REQUIRED, DO NOT DISASSEMBLE BORES UNLESS IT IS NECESSARY TO VERIFY MOVEMENT OF VALVES. 2. Verify movement of the valves in their normal installed position. Valves may become restricted during removal or installation. This is normal due to small tolerances between the valves and bores. 3. If a valve is restricted and cannot be corrected by cleaning the valve and bore, then replace the valve body. Describe the restricted valve on the repair order