Jeep Grand Cherokee 4XE 2021–2026 — technical service bulletin
Bulletin S2108000121 REV.B · NHTSA communication 11028892 · issued Feb 12, 2026
Technical service bulletin
communication type
Electrical System
component
2021–2026
model years
11
vehicle entries
Official summary
Check Engine Light On And Service Hybrid System Displayed. P0A0A-00 High Voltage System Interlock Circuit “A” Is Active
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.