1993 GMC Sierra service bulletins & manufacturer communications

4 manufacturer communications are on file with NHTSA for the 1993 GMC Sierra. TSBs are repair guidance for dealers — they are not recalls, and repairs are not automatically free.

• This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
  04-06-04-051F · Technical service bulletin · Fuel System, Gasoline · issued Mar 22, 2022
• Diagnosis of cracked or broken transmission case. *tt 2006 and prior cars and light duty trucks. *tt
  020730024A · Technical service bulletin · Power Train · issued Aug 1, 2005
• Spring slap noise from the rear of the gmt 400 series truck. *mn
  01570 · Technical service bulletin · Suspension · issued Jan 1, 2004
• Diagnostic information for intermittent transmission downshift, slip, busy/cycling tcc or noisy cooling fan. *tt
  990730016A · Technical service bulletin · Power Train · issued Oct 1, 2002