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Electronic Control Module
- (left hand front under battery)
  - 6 cylinder
  - 8 cylinder

Engine Computer for 1999 GMC Sierra 1500 HD

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There are 2 choices for the 1999 GMC Sierra 1500 HD Engine Computer !!!
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Electronic Control Module (left hand front under battery) 6 cylinder
Electronic Control Module (left hand front under battery) 8 cylinder

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