Some customers may comment that the Service 4WD light is on, the 4WD system is inoperative or the 4WD switch indicator lights are blinking.
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1 # : 4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, C0550 Set (Replace Transfer Case Encoder Sensor, Reprogram TCCM) - (Dec 16, 2004) Subject: 4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0550 Set (Replace Transfer Case Encoder Sensor, Reprogram TCCM) Models: Buick Rainier Chevrolet TrailBlazer, TrailBlazer EXT GMC Envoy, Envoy XL GMC Envoy XUV Oldsmobile Bravada with Four-Wheel Drive (4WD) Condition Some customers may comment that the Service 4WD light is on, the 4WD system is inoperative or the 4WD switch indicator lights are blinking. Service Diagnosis Technicians may find DTC C0327 in the Transfer Case Control Module (TCCM). This would indicate an encoder sensor malfunction. It is also possible that the module may be in a mode that will not allow any shifts or updates for the software or calibrations. If this occurs, the TREC fuse (in the engine compartment) must be pulled and reinstalled after 30 seconds. This should allow further operation and service of the system. If a C0550 code is found, this is an unrelated concern and SI diagnostics should be followed for this concern. Correction Important: Carefully handle and install the new encoder. Improper installation of the encoder could result in a repeat failure. 1. Raise the vehicle. 2. Disconnect the transfer case motor/encoder wiring harness. 3. Remove the four bolts that secure the motor/encoder to the transfer case. 4. Remove the motor/encoder from the transfer case.
2 5. Remove the black plastic gasket/over plate from the motor/encoder Push out the two "single" locking tabs (two lower arrows in illustration above) located on the underside of the housing (motor end) At the other end of the gasket/cover plate, place a flathead screwdriver tip (1) between the gasket/cover plate and the motor housing near the "dual" locking tabs. Twist the screwdriver clockwise/counterclockwise at both sides until the locking tabs break and the gasket/cover plate comes off Discard the gasket/cover plate.
3 6. Avoiding the wire connection, take two small flathead screwdrivers (one on each side of the encoder) and rock the encoder sensor out using light pressure on each screwdriver. 7. Gently remove the encoder sensor from the wire harness connector. Pry these apart by inserting a small flathead screwdriver between the terminals and the harness connector. Verify that no damage or corrosion exists on either male encoder terminals or female wiring harness terminals. 8. Install the new encoder sensor by connecting to the harness and then gently sliding the encoder sensor over the motor shaft. The hex feature (3) on the encoder should face down toward the motor housing. Make sure the tab (1) on the encoder mates with the notch (2) on the shaft. If the encoder tab is not aligned with the output shaft, rotate the encoder inner ring by hand to mate properly. Press the encoder fully onto the shaft and into the housing.
4 Important: Make sure the encoder cover (1) is flush or below the surface of the motor housing and fully seated into place. Ensure that the new encoder/harness assembly is fully seated to the encoder sensor. 9. Install a new gasket/cover plate. This should snap into position. Make sure all the four tabs are FULLY engaged. 10. Install the motor/encoder onto the transfer case using four M X.35 flange head bolts. Tighten Tighten all four bolts to 13.5 to 17.6 N m (10 to 13 lb ft). 11. Connect the transfer case motor/encoder wiring harness. 12. Following normal SPS reprogramming procedures, reprogram the transfer case control module with the latest software calibration. 13. Verify that the 4WD system is operational.
5 Parts Information Part Number Description Actuator Asm (NP4) Actuator Asm (NP8) Gasket/Cover Plate /226 AB Encoder Sensor Parts are currently available from GMSPO. Warranty Information For vehicles repaired under warranty, use: Labor Operation Description Labor Time K4124 Sensor Assembly, Transfer Case Range Selector - Replace 0.7 hr* *This labor time includes reprogramming. Add: with skid plate 0.2 hr Add: Diagnosis time hr 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.
Condition. Service Diagnosis. Correction
Subject: Models: 4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0500, P0836, P1875 Set (Replace Encoder Motor Sensor, Reprogram TCCM, Inspect Front Drive Axle Engagement Sleeve for
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