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Allison Transmission-No Shift
Symptom is P0748 Pressure Control Solenoid "A" Electrical code in TCM, and no shift out of first (I think) gear. Cleared code and it comes back instantly. Followed diagnostic procedure in Mitchell, which instructed to command trim solenoid A with scan tool, wi... Login to read more. 
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| Engine | 6.6 L |
| Trans | 5-speed Automatic (Electronic) |
Vehicle Data
2003 Chevrolet Silverado 3500 LS 6.6L
| Engine | 6.6 L |
| Trans | 5-speed Automatic (Electronic) |
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