Buick Encore Owners & Service Manuals

Buick Encore: Diagnostic information and procedures

Buick Encore 2012-2019 Service Manual / Transmission / Transfer Case - AAM / Diagnostic information and procedures


Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to Transfer Case Disassembled View, Transfer Case Description and Operation, and Rear Drive Axle Description and Operation , . All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start when repairs are necessary. For a detailed explanation, refer to Strategy Based Diagnosis .

Visual/Physical Inspection

  • Inspect for aftermarket devices, which could affect the operation of the vehicle. Refer to Checking Aftermarket Accessories .
  • Inspect the easily accessible or visible system components for obvious damage or conditions, which could cause the symptom.
  • Inspect for the correct lubricant levels and the proper viscosities.
  • Verify the exact operating conditions under which the concern exists. Note factors such as vehicle speed, road conditions, ambient temperature, and other specifics.
  • Compare the driving characteristics or sounds, if applicable, to a known good vehicle and ensure you are not trying to correct a normal condition.


Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

  • Diagnostic System Check - Vehicle .
  • Noisy in Drive.
  • Noisy When Coasting.
  • Intermittent Noise.
  • Constant Noise.
  • Transfer Case Leak Diagnosis.


Noisy in Drive

Noisy in Drive

Noisy in Drive


Noisy When Coasting

Noisy When Coasting

Noisy When Coasting


Intermittent Noise


Constant Noise

Constant Noise

Constant Noise


Transfer Case Leak Diagnosis

Transfer Case Leak Diagnosis

Transfer Case Leak Diagnosis

Transfer Case Leak Diagnosis


     Repair instructions - on vehicle

    Transfer case fluid replacement Removal Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Place a suitable drain pan under the transfer case. Fig. 2: Transfer

     Repair instructions - off vehicle

    Transfer case adapter disassemble (MHB) Fig. 40: Transfer Case Adapter (MHB) Transfer Case Adapter Disassemble (MHB) TRANSFER CASE ADAPTER DISASSEMBLE (M7Y, MZ4) Fig. 41: Transfer Case Adapter

     Description and operation

    Transfer case identification Fig. 71: Transfer Case Primary Identification Label The transfer case primary identification label (1) is located on the rear extension housing. The transfer case secon


     Instrument Cluster

    Warning lights and gauges can signal that something is wrong before it becomes serious enough to cause an expensive repair or replacement. Paying attention to the warning lights and gauges could prevent injury. Some warning lights come on briefly when the engine is started to indicate they are worki

     Schematic wiring diagrams

    ENGINE CONTROLS WIRING SCHEMATICS (ENCORE) Module Power, Ground, Serial Data, and MIL Fig. 1: Module Power, Ground, Serial Data, and MIL 5V1, 5V2, and Low Reference Bus (1 of 2) Fig. 2: 5V1, 5V2, and Low Reference Bus (1 of 2) 5V3, 5V4, and Low Reference Bus (2 of 2) Fig. 3: 5V3, 5V4, and Low

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