P0562 on Jeep

MP Compasses with engine Stop/Start carry a small auxiliary battery in addition to the main battery. When the auxiliary battery degrades - which owners commonly report at 2-4 years - it back-drains the main battery while the vehicle sits, leaving the Compass dead after a few days despite a new main battery, alternator and starter. The first warning is usually the Stop/Start Not Available message or a Stop/Start warning light, followed by intermittent no-crank, flickering dash lights and spurious module faults. Replacing only the main battery is the classic misdiagnosis; the pair must be healthy and both must be registered/relearned so the charging strategy is correct.

Gladiators with engine stop-start use a small AGM auxiliary battery (behind the main battery) that carries the vehicle's electronics during an auto restart. The aux battery and its intelligent battery sensor are chronic weak points: the aux cell degrades in two to four years, fails its startup self-test, and the truck posts "Stop/Start Not Ready" and "Aux Switches Unavailable." As it worsens owners see slow cranking, dead-truck no-starts with zero prior warning, random warning lights, radio resets, and even a drained main battery, because the failing aux battery loads the main pack.

Certain 2012-2014 Jeep Grand Cherokee vehicles are covered by alternator-diode safety recalls P60 / NHTSA 14V-634 or T36 / NHTSA 17V-435. P60 covers specified 3.6L vehicles with a 160A alternator. T36 covers VIN-included WK vehicles with electro-hydraulic power steering and specified 3.6L or 5.7L, 160A, 180A, or 220A configurations. FCA says thermal or rapid diode failure can stop alternator output, cause a stall with limited warning, or create a resistive short that produces heat, smoke, or an underhood fire. The exact campaign and completion status are VIN-specific.

Owners of 2022-2026 Grand Cherokee and Grand Cherokee L (WL) report severe parasitic battery drain: control modules (infotainment/radio, keyless entry, body modules) fail to enter sleep mode after the vehicle is shut off, rapidly draining the 12V battery. Some report a completely dead battery after the vehicle sits just 7-10 days, with repeated jump-starts and premature battery replacements early in the vehicle's life. The condition can disable safety and convenience features and has prompted a class-action investigation. Chrysler has acknowledged related concerns through TSBs addressing excessive module wake cycles and radio/infotainment-related drain.

Grand Cherokees with electro-hydraulic power steering subject the alternator to cyclical electrical loads that cause thermal failure of the internal diodes. The alternator can fail suddenly, stalling the vehicle without warning and, in some cases, short-circuiting and causing an under-hood fire. Multiple NHTSA campaigns cover the 160/180/220-amp units.

Owner reports and NHTSA complaints describe repeated dead 12V batteries and no-start conditions on Grand Wagoneer, often after sitting overnight or a few days. The pattern is consistent with parasitic draw from modules not going to sleep (commonly telematics/infotainment-related controllers), leading to low voltage and cascading network faults.

eTorque (mild-hybrid) Wranglers replace the conventional alternator/starter with a 48V belt-driven motor-generator (BSG/MGU) plus a 48V power pack unit (PPU) and a 12V system. Owners report charging-system failures, battery warning lights, rough/failed auto-starts during stop-start cycling, voltage drops, stalling, and no-starts. The most common culprit is the 48V PPU rather than the MGU itself, though both fail. The MGU/BSG (Mopar 68452771AF) is expensive and, once replaced, must be programmed with the dealer scan tool or it will not function. Components fall under the 8-year/80k-mile hybrid warranty, but out-of-warranty repairs are costly.