Jeep Wrangler 2021 — technical service bulletin
Bulletin 18-005-26 REV.A · NHTSA communication 11029673 · issued Feb 17, 2026
Technical service bulletin
communication type
Engine
component
2021
model years
1
vehicle entries
Official summary
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P08A6 - Gear Lever Position Sensor System – Multiple Sensor Correlation. (Manual Transmission and NA Only) ● P152F - Engine Hood Switch 2 / Engine Hood Switch 1 Correlation. (NA Only) ● P0300 - Multiple Cylinder Misfire. Customers may also comment on one or more of the following: ● "Service Transmission” message on in the Instrument Panel Cluster (IPC) due to clutch slip
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.