P0736: How to Diagnose & Fix — Reverse Incorrect Gear Ratio

How to Fix

Have a Ford/Lincoln-capable technician confirm the transmission and build date, retrieve PCM/TCM faults, and follow TSB 22-2428 in order. The bulletin begins with available PCM/TCM programming and an adaptive-learning drive cycle, then uses the stored faults and clutch behavior to select an accelerated main-control break-in routine. If the condition remains, the procedure can require main-control overhaul and, only after the bulletin's later tests fail, condition-specific internal transmission repair. Parts and coverage must be selected by VIN and the actual failed step; this record intentionally has no buy link.

Owner tips & cautions

• TipRecord the exact shift or engagement event and ask for the PCM/TCM fault report plus the TSB decision-tree step that failed before approving internal transmission work.
• WarningDo not order a valve body or CDF part from harsh shifting alone; Ford's procedure can resolve the condition through programming, adaptive learning, or clutch cycling before parts are selected.

How to Fix

Scan for transmission codes; for limp mode inspect/replace the conductor plate (with integrated speed sensors) and any failed shift solenoid, and replace the 13-pin connector adapter/seal if leaking. Perform a full fluid-and-filter service with the correct ATF (MB 236.x / Mopar spec). Address water intrusion at the fill tube. Severe internal damage from prolonged shudder may require a rebuild.

How to Fix

Confirm the VIN build record, 545RFE sales code DGQ, stored transmission DTCs, and TCM event data. Read digits three through six of the TCM barcode; TSB 08-016-05 identifies 0984 through 0405 as the suspect controller build range. If the vehicle or controller date is outside scope, the bulletin does not apply and the transmission complaint needs its normal diagnostic path. For an in-scope vehicle, use the bulletin's P0868/gear-ratio decision path and compare desired, scan-reported actual, and mechanically measured line pressure with correct fluid level and temperature. Inspect wiring, connectors, cooler lines, leaks, and engine driveability first. The repair may involve the TCM and, when low pressure was present, inspection for clutch-disc damage; it is not a universal retail-parts fix. No commerce links are shown until those findings identify the required repair.

Owner tips & cautions

• WarningDo not apply this TSB to every 45RFE/545RFE complaint. It requires a 2004 WJ/WG, 4.7L/4.7L H.O., sales code DGQ, the bulletin's vehicle build range, a listed DTC, and a suspect TCM date code.
• TipPreserve the TCM event data before clearing codes. The bulletin uses that data and the controller barcode date to separate a controller fault from actual low pressure and clutch damage.
• WarningA filter kit, ATF, cooler, Sonnax valve, separator plate, or solenoid pack is not a complete answer to this card. The old links represented different failure paths and have been removed.

How to Fix

Check the VIN against NHTSA 25V164000. Dealers replace the transmission main control valve body free of charge; owner letters were mailed April 11, 2025. If the truck moves in a direction that does not match the selected gear, stop using it and have it towed — do not rely on the parking brake alone as a workaround.

How to Fix

Replace the conductor plate (Mercedes p/n A140 270 13 61 or supersession). The 722.6 conductor plate is plug-and-play with no coding required (unlike the later 722.9). Always replace the 13-pin pilot bushing/connector adapter at the same time — ATF wicks up through the old one and ruins the TCM. Do a full fluid and filter change while the pan is off. DIY kit + plate runs $250-450 in parts; shop labor adds $400-800. Continuing to drive in limp mode can damage clutches and turn this into a $3000+ rebuild.