Where Is 2015 Jeep Cherokee ESS Battery Located?
The 2015 Jeep Cherokee ESS (Engine Start/Stop) auxiliary battery is typically located in the rear cargo area, beneath the floor panel on the driver’s side. This secondary battery supports the vehicle’s stop-start system, ensuring uninterrupted power to critical electronics during engine restarts. Pro Tip: Accessing it requires removing the cargo floor trim—use a trim removal tool to avoid damaging clips or panels. Always disconnect the negative terminal first for safety.
Why does the Cherokee ESS use a secondary battery?
ESS systems require auxiliary batteries to maintain voltage stability during engine restarts. The 2015 Cherokee’s 12V AGM battery handles infotainment, lights, and ECUs while the main battery cranks the engine. Pro Tip: Test both batteries if the stop-start malfunctions—weak auxiliary units often trigger system errors.
Beyond basic functionality, the ESS auxiliary battery prevents voltage drops that could reset sensitive modules. For example, a failing auxiliary battery might cause the Uconnect system to reboot during stops. Technically, it’s a 12V, 20–30Ah AGM battery rated for 500+ cycles. Warning: Never substitute a standard flooded battery—AGM’s low internal resistance suits frequent cycling.
How to safely replace the ESS auxiliary battery?
Replacement requires accessing the cargo area and disconnecting the main battery first. After removing the cargo floor panel, unbolt the auxiliary battery’s hold-down bracket and terminals. Pro Tip: Code-reset procedures may be needed post-replacement—use a OBD-II scanner to clear ESS fault codes.
Practically speaking, you’ll need a 10mm socket for terminals and a T20 Torx for trim screws. For instance, a Mopar 68091131AA AGM battery is OEM-spec. Critical step: Wear gloves—AGM batteries contain pressurized electrolyte. Did you know reversing terminals can fry the Power Control Module? Always double-check polarity.
| Step | Tool | Precaution |
|---|---|---|
| Disconnect main battery | 10mm wrench | Prevents short circuits |
| Remove cargo trim | Trim tool | Avoids broken clips |
| Swap auxiliary battery | T20 Torx | Match polarity |
Battery Expert Insight
FAQs
Not recommended—bypassing ESS may trigger fault codes and reduce fuel efficiency. Instead, maintain both batteries and replace them every 4–5 years.
What voltage indicates a failing ESS auxiliary battery?
Below 12.4V at rest (engine off) signals degradation. Use a multimeter—readings under 12V demand immediate replacement.