Mooresworld

UPDATE 4-23-2019: After more that 8 weeks at the dealer, Ford Engineering stepped in and solved the problem by replacing the transmission! Because it's considered part of the hybrid system, which is under warranty here in California for 150,000 miles, there was NO CHARGE! It drives like new, despite the 125,000 miles I've put on it. PS The water in the battery compartment came from a missing seal from the bumper I replaced. That's the body shop's fault. Unrelated to the engine stalling issue.

Thanks for the washer hose idea! I've passed it on to the mechanic to check.

Took it to another Ford dealer today. They discovered liquid (water intrusion they call it) in the battery compartment. Both batteries, they say. They're removing the hybrid battery (with my permission; $450 labor estimate for the inspection). Hoping this explains what's been going on. I don't know how the water could have gotten in. I've had no spills in the cargo area. I would like to think this will be covered by the hybrid part warrantee, but because of the water intrusion, the mechanic is skeptical. Also, this mechanic DID get a power disconnect code on the pin point test, which they say requires the hybrid battery removal for proper diagnosis.

Thank you both for your suggestions. Once I limp over to the side of the road on battery power, if I turn off the ignition and turn it back on, it returns to normal operation (until the next incident, which could be days or weeks later). I purchased an OBD2 scanner (Autel MaxiLink ML529) and ran an OBD scan immediately after the yellow wrench shutdown. No codes were found. The Ford mechanics also found no stored codes. I know the ICE only shuts down because my instrument panel is set to show ICE/electric gauges. The A/C seems to shut down anywhere between immediately before ICE failure to 30 seconds before. The failure can happen after driving for hours or minutes, so far, in cool weather. The Ford mechanic pulled rear panels to check for wiring problems and found none.

For the past 4 months, my 2013 C-max has had the gas part of the engine stop running while driving. The electric continues enough to get off the road, until the battery is depleted. This is often accompanied by a yellow wrench alert, but not every time. The shutdown is preceded by the A/C cutting off, weakly blowing warm air while another fan under the dash runs very loudly. Once I limp over to the side of the road on battery power, if I turn off the ignition and turn it back on, it returns to normal operation (until the next incident, which could be days or weeks later). I purchased an OBD2 scanner (Autel MaxiLink ML529) and ran an OBD scan immediately after the yellow wrench shutdown. No codes were found. The Ford mechanics also found no stored codes. I've taken it in to the dealer, but so far, they haven't been able to pull any codes after one of these events. They've updated the PCM to the latest version, but that hasn't solved the problem. They are stumped. Has anyone had this problem and found a solution?