Jeep U0155
LOST COMMUNICATION WITH CLUSTER/CCN (ESM) U0129-00-LOST COMMUNICATION WITH BRAKE SYSTEM MODULE 1 U11C3-ESM LOST COMMUNICATION WITH TCM O
Quick answer
U0155 is identified in verified Jeep manufacturer communications as “Lost Communication With Cluster/CCN (ESM).” The supplied evidence also associates it with other communication DTCs involving the transmission control module, body control module, brake system module, and other modules. The severity, drivability, charging status, and specific repair are not yet established by verified evidence.
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 U0155 mean?
U0155 is identified in verified Jeep manufacturer communications as “Lost Communication With Cluster/CCN (ESM).” The supplied evidence also associates it with other communication DTCs involving the transmission control module, body control module, brake system module, and other modules. The severity, drivability, charging status, and specific repair are not yet established by verified evidence.
2. Technical explanation
This is a network communication diagnostic trouble code (DTC) referenced in official Jeep manufacturer communications. One verified communication lists U0155-00 as “Lost Communication With Cluster/CCN (ESM).” Another official communication lists U0155 among relevant loss-of-communication (LOC) codes and states that, when multiple modules report the same LOC, the ESM is not the cause because it is not a gateway module.
3. What system is affected?
Cluster/CCN communication as referenced by ESM. The verified evidence also references communication with the TCM, body control module, brake system module 1, and other modules when multiple LOC DTCs are present.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- A cluster/CCN-related loss-of-communication DTC may be stored: U0155-00.
- Additional loss-of-communication DTCs may be present, including codes involving the TCM, body control module, or brake system module 1. Specific driver-visible symptoms are not yet established by verified evidence.
6. Possible causes
- When multiple LOC DTCs are present, the official manufacturer communication directs checking battery health, system voltage, and the TCM; the supplied evidence does not establish a final root cause.
- If multiple modules report the same LOC, the ESM is not the cause because it is not a gateway module.
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 whether multiple loss-of-communication codes are present.
- Arrange diagnosis by an authorized Jeep service facility or appropriately qualified technician.
- Do not assume the ESM is the cause solely because multiple modules report the same loss-of-communication condition.
10. Step-by-step troubleshooting
- The verified Jeep manufacturer communication directs technicians to read DTCs.
- For multiple LOC DTCs, the communication directs checking battery health, system voltage, and the TCM.
- No further diagnostic sequence is established by the supplied verified evidence.
11. When to contact service
Service need is not yet established by verified evidence. However, diagnosis by a qualified Jeep service provider is appropriate because official manufacturer communications identify checks involving battery health, system voltage, and the TCM.
12. What the service center may check
- Read all DTCs.
- Determine whether multiple loss-of-communication DTCs are present.
- Check battery health.
- Check system voltage.
- Check the TCM.
- Do not identify the ESM as the cause when multiple modules report the same LOC, because the official communication states that the ESM is not a gateway module.
13. Possible repair or resolution
- Not yet established by verified evidence.
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. It lists U0155 among relevant LOC DTCs and directs checks of battery health, system voltage, and the TCM when multiple LOC DTCs are present. It also states the ESM is not the cause when multiple modules report the same LOC.
- NHTSA Manufacturer Communication PDF 11027642: S2623000002, published January 9, 2026. It lists U0155-00 as “Lost Communication With Cluster/CCN (ESM)” and references related lost-communication messages.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Official NHTSA-hosted Jeep manufacturer communications: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842 and https://static.nhtsa.gov/odi/tsbs/2026/MC-11027642-0001.pdf
19. Frequently asked questions
What does U0155 mean?
Verified Jeep manufacturer communication identifies U0155-00 as “Lost Communication With Cluster/CCN (ESM).”
Is the ESM the cause when several modules report the same LOC?
No. The verified manufacturer communication states that the ESM is not the cause in that circumstance because it is not a gateway module.
What does the manufacturer communication direct technicians to check if multiple LOC codes are present?
It directs checks of battery health, system voltage, and the TCM.
Can the vehicle be driven or charged with U0155?
Not yet established by verified evidence.