The manual shows a variety of conditions that can affect the Stop/Start feature other than the battery. If the issue is traced to the battery, it doesn't necessarily mean that the battery is bad. It may just need charging like mine does every now and then.
Battery state of charge (SOC) is big part of the system shutting off, here's a few more than can shut the system off, not as simple as some people might think.
Vehicle speed is 0 kph (0 mph) • Accelerator pedal is released. • Brake pedal is applied - Brake on/off switch activated (indicates ON) • Clutch pedal cruise control deactivator switch indicates the clutch pedal is released. Clutch pedal in full TOP position of travel. (manual transmission only) • Brake system pressure is approximately 482 kPa (70 psi) or greater • ABS is not active • Brake booster vacuum is present and a vacuum change does not occur while the vehicle is stopped • Gear selector lever in ‘N’ neutral for manual transmissions and ‘D’ drive for auto transmissions • Battery temperature is between 5° C (41° F) to 60° C (140° F) • A/C system is OFF, or there is no change in the A/C system request while the vehicle is stopped • If the A/C system is ON, ambient temperature should be less than 35° C (95° F) • Road grade while stopped is less than 15% • All doors remain closed and the occupied front seats have the seat belt latched. • The 110v alternating current inverter (if equipped) is under 10w electrical load and the electrical load does not change while stopped • Trailer harness is not connected • Tow/haul mode is not active • 4WD (if equipped) is in the 2WD position and does not change while stopped • Electronic locking differential (ELD), if equipped, is not engaged • In-car temperature is steady and no change is requested from the heating or A/C system • Engine coolant temperature is at the normal operating temperature • Max A/C or defrost is not selected • Blower fan control is at one speed setting and a speed change request does not occur while the vehicle is stopped • Rear defrost is not selected and a rear defrost request does not occur while the vehicle is stopped • Battery and charging system voltage is greater than 11.3 volts • Electrical load is less than 65 amps and a voltage or amperage load change does not occur while the vehicle is stopped • Steering wheel angle is less than 90° from the center position and a steering input change does not occur while the vehicle is stopped • Hill start assist is not active • Automatic transmission fluid temperature is less than 110° C (230° F) • Fuel level is greater than 1/8 full and the low fuel warning is not active.
My 2021 Explorer ST just started doing the same thing. After charging the battery it measures 12.3V with the engine off so I'm assuming it's a battery issue. Has anyone else reported this issue or found a solution other than replacing a 2 year old battery?
Welcome to the Forum.
I believe replacing the battery is the only "fix". When this "feature" stopped functioning I considered it a plus. However about 6 or so months later I noticed some weak starts. Dealer tested the battery as failed and replaced it under warranty about 2 weeks before the end of the vehicle's 3 year warranty.
Charging the battery has always worked for me over the last 3.5 years. If I were to put in a new battery, I would run into the same issue likely toward the end of the first year due to my driving or lack thereof.
Had the same problem in warranty but dealer said the battery was ok and said the Auto Stop Start could be caused by many other issues than the battery. Then after another required jump I got a Walmart Battery (760CCA vs 720CCA and much much better warranty) and that fixed the problem. I no longer use that dealer.
(Ford Technician) I see quite a few complaints on the system and it usually revolves around what Ford refers to as "state of charge" I see quite a few vehicles come in and it's at 50% or lower but the owners report no other concerns, I charge up the battery, reset the battery state of charge (need scan tool) and this usually takes care of the problem for awhile.Charging the battery has always worked for me over the last 3.5 years. If I were to put in a new battery, I would run into the same issue likely toward the end of the first year due to my driving or lack thereof.
Peter
