Jeep U11C3
If multiple LOC DTCs are present: a. Check battery health, system voltage, and TCM (including valve b
Quick answer
For Jeep Grand Cherokee and Wagoneer vehicles, model years 2024–2026 in the US, DTC U11C3 is listed in an official manufacturer communication concerning loss-of-communication (LOC) diagnostics. When multiple LOC DTCs are present, the communication directs technicians to check battery health, system voltage, and the TCM, including the valve body (text supplied is truncated).
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1. What does U11C3 mean?
For Jeep Grand Cherokee and Wagoneer vehicles, model years 2024–2026 in the US, DTC U11C3 is listed in an official manufacturer communication concerning loss-of-communication (LOC) diagnostics. When multiple LOC DTCs are present, the communication directs technicians to check battery health, system voltage, and the TCM, including the valve body (text supplied is truncated).
2. Technical explanation
Verified evidence identifies U11C3 as one of several relevant LOC-related DTCs in NHTSA Manufacturer Communication 11021842 / 9100641. The supplied evidence states that when multiple modules report the same LOC, the ESM is not the cause because it is not a gateway module. For multiple LOC DTCs, the documented diagnostic direction is to check battery health, system voltage, and the TCM, including the valve body; the supplied source excerpt ends mid-sentence, so further steps are not established by verified evidence.
3. What system is affected?
Loss-of-communication (LOC) diagnostic context involving vehicle control modules. The verified source specifically references the ESM and TCM; a complete system assignment for U11C3 is not yet established by verified evidence.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- Multiple LOC DTCs may warrant checking battery health, system voltage, and the TCM, including the valve body, according to the verified manufacturer communication.
- The ESM is not the cause when multiple modules report the same LOC, according to the verified source, 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
- Have a qualified service technician retrieve and assess all stored DTCs, particularly if multiple LOC DTCs are present.
- Use the applicable manufacturer diagnostic information and the official communication as part of diagnosis.
- Do not assume the ESM is the cause solely because multiple modules report the same LOC.
10. Step-by-step troubleshooting
- Read all DTCs.
- If multiple LOC DTCs are present, check battery health.
- If multiple LOC DTCs are present, check system voltage.
- If multiple LOC DTCs are present, inspect or diagnose the TCM, including the valve body, using manufacturer procedures. Further details are not present in the supplied evidence.
11. When to contact service
Service evaluation is appropriate when U11C3 is stored, especially when multiple LOC DTCs are present. The verified evidence does not establish urgency, drivability, or charging guidance.
12. What the service center may check
- Retrieve DTCs and determine whether multiple LOC DTCs are present.
- Check battery health.
- Check system voltage.
- Check the TCM, including the valve body, as directed by the manufacturer communication.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied official communication provides diagnostic checks but does not provide a complete repair outcome or repair procedure.
14. Affected vehicles
- Jeep Grand Cherokee · 2024–2026 · US
- Jeep Wagoneer · 2024–2026 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 11021842, manufacturer communication number 9100641, published August 5, 2025. It lists U11C3 among relevant codes and states that, if multiple LOC DTCs are present, battery health, system voltage, and the TCM including the valve body should be checked. Source: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified official source: NHTSA Manufacturer Communication 11021842 (9100641), published August 5, 2025: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11021842
- NHTSA: NHTSA Manufacturer Communication 11021842: 9100641 · official_tsb
19. Frequently asked questions
What does U11C3 mean for the listed Jeep vehicles?
The verified evidence lists U11C3 as a relevant DTC in a manufacturer communication addressing LOC diagnostics. The supplied canonical wording says: “If multiple LOC DTCs are present: a. Check battery health, system voltage, and TCM (including valve b”. The text is truncated, so a complete definition is not established by verified evidence.
Does U11C3 mean the ESM has failed?
No conclusion can be made from U11C3 alone using the supplied evidence. However, the official communication states that when multiple modules report the same LOC, the ESM is not the cause because it is not a gateway module.
What should be checked if U11C3 occurs with multiple LOC codes?
The verified manufacturer communication directs checks of battery health, system voltage, and the TCM, including the valve body. The source excerpt does not provide the remainder of the procedure.
Which vehicles are covered by the verified applicability data?
Jeep Grand Cherokee and Jeep Wagoneer vehicles, model years 2024 through 2026, in the US.