2001 Ford F45-0 P0750, P0443, P1747, P0755, P0743 - Transmission Flutter and Stalling in Drive/Reverse
My 2001 Ford F450 V10 is running smoothly at idle but exhibits a noticeable flutter and fails to move when shifted into drive or reverse. Under load—such as climbing a hill—the truck completely stalls. The vehicle displays multiple OBD-II fault codes: P0750, P0443, P1747, P0755, and P0743. I've reviewed each code's description but am unsure which one is the root cause. The truck operates fine at idle, yet struggles significantly in motion. Could any of these codes be directly linked to the transmission behavior? Any insights or troubleshooting steps would be greatly appreciated.
Start with P1747 — this indicates a transmission pressure control solenoid fault, which is typically related to transmission performance. The P0750, P0755, and P0743 codes are likely connected as they all pertain to transmission gear shifting and solenoid operation. For P0443 (secondary purge valve circuit), check for proper voltage at the purge valve and inspect wiring harness integrity. Begin by checking underhood fuses, examine the transmission harness — especially the connector at the transmission. Ensure it is securely connected, free from corrosion, pinching, chafing, or damage. Look out for liquid ingress that could cause short circuits.