Jeep U0140
LOST COMMUNICATION WITH BODY CONTROL MODULE (ESM) U0155-00-LOST COMMUNICATION WITH CLUSTER/CCN (ESM) U0129-00-LOST COMMUNICATION WITH BR
Quick answer
U0140 is listed in verified Jeep service evidence as an Electronic Shift Module (ESM) bus-message communication DTC: “Lost Communication With Body Control Module (ESM).” The same evidence also references U0155-00 and U0129-00 ESM-related lost-communication messages.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does U0140 mean?
U0140 is listed in verified Jeep service evidence as an Electronic Shift Module (ESM) bus-message communication DTC: “Lost Communication With Body Control Module (ESM).” The same evidence also references U0155-00 and U0129-00 ESM-related lost-communication messages.
2. Technical explanation
Verified Jeep manufacturer communications identify U0140-00 as “Lost Communication With Body Control Module (ESM).” A 2026 Jeep communication describes this code among DTCs specific to ESM bus messages. The supplied diagnostic record also includes U0155-00, “Lost Communication With Cluster/CCN (ESM),” and U0129-00, with the title truncated as “Lost Communication With BR.” One verified manufacturer communication states that when multiple modules report the same loss-of-communication (LOC) message, the ESM is not the cause because it is not a gateway module. It further directs diagnosis of multiple LOC DTCs to battery health and system voltage. Further diagnostic criteria are not established by the supplied verified evidence.
3. What system is affected?
Electronic Shift Module (ESM) bus-message communications, including communication with the Body Control Module and, where stored, the cluster/CCN and the module identified in the record as “BR.”
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- An ESM-related lost-communication DTC may be stored: U0140-00, “Lost Communication With Body Control Module (ESM).”
- The supplied evidence also identifies U0155-00 and U0129-00 as ESM-related lost-communication messages.
- Driver-visible symptoms are not yet established by verified evidence.
6. Possible causes
- If multiple modules report the same loss-of-communication message, verified Jeep evidence states that the ESM is not the cause because it is not a gateway module.
- For multiple loss-of-communication DTCs, verified Jeep evidence directs checks of battery health and system voltage.
- Additional causes are not yet established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Record all stored DTCs and note which modules report them.
- Arrange diagnosis by a qualified Jeep service facility, particularly if multiple loss-of-communication DTCs are present.
- Do not attempt high-voltage-system repairs based on this communication code.
10. Step-by-step troubleshooting
- Read all DTCs.
- Determine whether multiple loss-of-communication DTCs are present.
- If multiple LOC DTCs are present, check battery health and system voltage, as directed by the verified manufacturer communication.
- If multiple modules report the same LOC, do not assume the ESM is the cause; the verified communication states that the ESM is not a gateway module.
11. When to contact service
Service need is not explicitly established in the supplied diagnostic record. A qualified Jeep service facility should diagnose persistent or multiple loss-of-communication DTCs using the applicable manufacturer procedure.
12. What the service center may check
- Read DTCs across relevant modules.
- Assess whether multiple modules report the same LOC condition.
- Check battery health.
- Check system voltage.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied evidence provides diagnostic direction but does not document a confirmed repair outcome.
14. Affected vehicles
- Jeep Grand Cherokee · 2022–2026 · US
- Jeep Grand Cherokee · 2024–2026 · US
- Jeep Wagoneer · 2022–2026 · US
- Jeep Wagoneer · 2024–2026 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 11021842: 9100641, published August 5, 2025. Verified summary: lists U0140 among relevant LOC DTCs; states that if multiple modules report the same LOC, the ESM is not the cause because it is not a gateway module; directs checks of battery health and system voltage when multiple LOC DTCs are present.
- NHTSA Manufacturer Communication 11027642: S2623000002, published January 9, 2026. Verified summary: identifies U0140-00, U0155-00, and U0129-00 among DTCs specific to ESM bus messages.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official sources: NHTSA Manufacturer Communication 11021842 (9100641), https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842; and NHTSA Manufacturer Communication 11027642 (S2623000002), https://static.nhtsa.gov/odi/tsbs/2026/MC-11027642-0001.pdf.
19. Frequently asked questions
What does U0140 mean in the supplied Jeep evidence?
It is identified as U0140-00, “Lost Communication With Body Control Module (ESM).”
Does U0140 prove the Electronic Shift Module has failed?
No. The verified communication states that if multiple modules report the same loss-of-communication message, the ESM is not the cause because it is not a gateway module.
What does the verified procedure call for when multiple LOC codes are present?
It directs checks of battery health and system voltage.
Which vehicles are listed in the supplied applicability data?
Jeep Grand Cherokee and Jeep Wagoneer, model years 2022 through 2026 in the US. The supplied data contains overlapping 2024 through 2026 entries for both models.