P0736

P0736 indicates the TCM saw an out-of-range input-to-output speed ratio while reverse was commanded, meaning the transmission either did not fully engage reverse, slipped while loaded in reverse, or engaged a wrong element. Cheapest-first ladder: verify fluid level and condition first (low fluid loses reverse before it loses forward gears on most planetary designs); road test in reverse with the scan tool graphing input and output speed and line pressure; inspect for a leaking reverse servo or accumulator on units that use one; pull the pan and inspect the filter and magnet for clutch fiber or steel debris before opening the valve body. Caveat: a no-reverse condition with a clean P0736 and no other codes on a high-mileage unit is almost always a worn reverse clutch pack or a cracked reverse drum.

Vehicle-specific patterns: 2004-2010 Honda Odyssey and Pilot with the 5-speed BYBA/BGRA set P0736 from 3rd-clutch pressure-switch failure combined with worn 3rd clutch packs. 2006-2012 GMC Acadia/Saturn Outlook with the 6T70/6T75 throw P0736 when the 1-2-3-4 and 3-5-Reverse wave plates fracture. 2003-2009 Saab 9-3 and Volvo S60 with the Aisin AW55-50SN lose reverse from valve body bore wear; a Sonnax AW55-50SN reseal and oversized valve kit is the standard repair when caught early. 2001-2007 Ford Escape with the CD4E sets P0736 once the forward/reverse drum cracks. Estimated repair: $380 to $4,500.