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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Automatic Transmission - ALLISON - Service, Diagnosis & Troubleshooting) >> Transmission Will Not Stay in Forward or Reverse

Transmission Will Not Stay in Forward or Reverse

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Transmission Will Not Stay in Forward or Reverse

Condition Action
Low fluid Adjust the fluid level. Refer to Transmission Fluid Checking Procedure .
Leaking at solenoid assembly Replace the solenoid assembly. Refer to Control Valve Solenoid Replacement (PCS1 and PCS2) or Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) .
Low pressure Repair the transmission.
Faulty solenoid - leaking Replace the solenoid. Refer to Control Valve Solenoid Replacement (PCS1 and PCS2) or Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) .