{"nhtsa_id":11021842,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-08-13","date":"2025-08-05","document_id":"9100641","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"Symptoms/Condition: Shifter reports loss communication AND NO OTHER MODULES report the condition. Diagnostic: Please make sure ONLY shifter reports loss communication. If there are other modules reporting loss communication, then follow the existing service procedure Repair Procedure: 1. Verify Complaint - ESM reports a Loss of Communication (LOC) DTC, but no other modules do. - If multiple modules report the same LOC, the ESM is not the cause (its not a gateway module). 2. Read DTCs - Relevant codes: U0101, U0140, U0155, U0129, U11C3, U0402, U0422, U0423, U0415, U145D. - If multiple LOC DTCs are present: a. Check battery health, system voltage, and TCM (including valve body). b. If TCM goes offline, ESM may falsely report LOC DTCs. 3. Check Environmental Data - Look for voltage/system issues at the same mileage. a. If DTCs clear, do not replace ESM. b. If not, inspect: b.1 Module connectors/pins: If damaged, dont repair shifter. b.2 TCM connectors/pins: Same rule. b.3 AGSM connectors/pins: If damaged, repair shifter. b.4 AGSM wiring harness: If damaged, dont repair shifter. 4. Review Past Service - Confirm battery and TCM-related repairs are still effective. a. If not, fix and clear DTCs. b. If yes, continue. 5. Check for Other LOCs - If other modules report LOC to the same module, inspect that module. - If not, repair the AGSM. Additional Description: - The ESM only communicates with the TCM and is fully controlled by it. - In non-combustion engines, the TCM is replaced by the PCM. - If a stored DTC in the ESM disappears and doest return, do not replace the ESM.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021842-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021842-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11021842","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["U0101","U0129","U0140","U0155","U0402","U0415","U0422","U0423","U11C3","U145D"],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_jeep_grand-cherokee","2025_jeep_grand-cherokee","2026_jeep_grand-cherokee"]},{"make":"JEEP","model":"GRAND CHEROKEE 4XE","year_from":2024,"year_to":2026,"match":"base","vehicle_ids":["2024_jeep_grand-cherokee","2025_jeep_grand-cherokee","2026_jeep_grand-cherokee"]},{"make":"JEEP","model":"GRAND CHEROKEE L","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_jeep_grand-cherokee-l","2025_jeep_grand-cherokee-l","2026_jeep_grand-cherokee-l"]},{"make":"JEEP","model":"GRAND WAGONEER","year_from":2024,"year_to":2025,"match":"exact","vehicle_ids":["2024_jeep_grand-wagoneer","2025_jeep_grand-wagoneer"]},{"make":"JEEP","model":"WAGONEER","year_from":2024,"year_to":2025,"match":"exact","vehicle_ids":["2024_jeep_wagoneer","2025_jeep_wagoneer"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}