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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Transfer Case - NVG 246-NP8 - Service & Diagnosis) >> Diagnostic Information and Procedures >> DTC C0550 >> Test Description

Test Description

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The number below refers to the step number on the diagnostic table.

  1. 2:  This step replaces the transfer case shift control module.
DTC C0550

Step Action Yes No
Schematic Reference:  Transfer Case Control Schematics  
Connector End View Reference:  Transfer Case Control Connector End Views  
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?
System OK -