How to Fix the Dodge Hornet Adaptive Cruise Control Unavailable Error
You’re cruising down the highway, the adaptive cruise is doing its thing, and then—bam—a warning light flashes, and you get that dreaded message: “Adaptive Cruise Control Unavailable. Service Required.” It’s frustrating, but you’re not alone, and there are fixes.
TL;DR
The “Adaptive Cruise Control Unavailable” error on the Dodge Hornet is usually caused by a software glitch, a blocked or dirty radar sensor, or a weak 12V battery. Most cases are fixed with official software updates from Dodge (TSB 08-279-25 for 2025 models and TSB 08-280-25 for 2024 models) . Sometimes it’s as simple as cleaning the windshield or removing road grime from the front fascia. If those don’t work, a dealer visit is necessary for a DASM update or battery replacement. The error often triggers code C1409-97, meaning the radar sensor is “blind” or obstructed .
Key Takeaways
- TSBs Are the Primary Fix: Technical Service Bulletins 08-279-25 and 08-280-25 address this exact issue. A dealer flashes the Driver Assistant System Module (DASM) with updated software .
- Check the Simple Things First: Dirt, mud, snow, or ice on the front fascia can block the radar sensor. A car wash or wiping the sensor area might resolve it instantly .
- Watch the 12V Battery: Weak or faulty batteries are a known issue on early Hornets and can cause all sorts of electrical gremlins, including cruise control failures .
- Environmental Factors Matter: Bright sun glare, heavy rain, or fog can temporarily blind the system. This may be unavoidable and isn’t necessarily a defect .
- Don’t Ignore It: This isn’t just an annoyance. The system is a safety feature, and a dealer visit is the most reliable way to get it fixed under warranty.
The Main Culprits: Software and Sensors
The most common cause of this error is a software bug, not a hardware failure. Dodge has issued specific bulletins to address it.
Technical Service Bulletins (TSBs) Are Your First Stop
If your Hornet’s adaptive cruise control is unavailable and the dashboard shows a Malfunction Indicator Lamp (MIL), it’s likely triggering Diagnostic Trouble Code (DTC) C1409-97. This code means the radar sensor is reporting it’s “blind” or obstructed .
TSB 08-279-25 (2025 Models): This bulletin instructs technicians to inspect and update the Driver Assistant System Module (DASM). It specifically applies to vehicles built on or before July 18, 2025 . The update reprograms the module to fix logic-based triggers causing the error.
TSB 08-280-25 (2024 Models): This is a similar update that also covers the 2024 Hornet . It involves checking and potentially updating the DASM, the HALF module, and the Instrument Panel Cluster (IPC).
TSB 08-062-24: For older models, this was an earlier update that fixed cruise control issues with the same C1409-97 code .
Physical Obstructions: The Easy Fix
The radar sensor lives behind the front fascia (bumper). Anything blocking it can trigger the error. These sensors are sensitive to “mud, ice, snow, etc.,” and aftermarket accessories mounted on the front can also cause problems .
What to do: Give your car a wash, paying particular attention to the front bumper area. One owner resolved the issue by cleaning the inside of the windshield in front of the sensor . If the error clears, you’ve found the culprit.
The Weak Battery Connection
A surprising number of electrical issues on the Hornet, including the cruise control error, trace back to the 12V auxiliary battery. One owner reported their 2023 Hornet had a dead battery, threw codes, and the cruise control stopped working. A dealer replaced the battery and applied system updates, and the car worked perfectly afterward . The community suggests that Stellantis batteries can be faulty, especially in early models that sat in Italy for extended periods .
Environmental “Normal” Operation
Sometimes, the system shuts off intentionally. The owner’s manual notes that the Active Driving Assist may have “limited or reduced functionality” if the sensors are covered. In real life, bright sunlight, heavy rain, and fog can cause the system to error out . One owner noted that running the windshield wiper fluid can sometimes clear the camera lens .
Step-by-Step Troubleshooting Guide
Here’s a practical path to follow when you see the error.
- Clean the Car: Take your Hornet through a car wash or manually clean the front fascia and the windshield area behind the rearview mirror. This removes simple obstructions like dirt or bugs .
- Check Your Battery: If your Hornet is a 2023 or early 2024 model, ask your dealer to test the 12V battery. Replacing it might be the easiest fix if it’s weak .
- Visit the Dealer for Updates: If cleaning doesn’t work, schedule a service appointment and specifically ask about TSBs 08-279-25 (2025) or 08-280-25 (2024). The dealer will use the wiTECH diagnostic tool to update the DASM software .
- ADAS Calibration: If the system still fails, the dealer may need to perform an Advanced Driver Assistance Systems (ADAS) calibration. This realigns the sensors to factory spec .
- Accept the Limits: Be aware that the system might occasionally error out due to weather or sun, which may be “normal” operation .
Comparison of Common Fixes
| Issue | Solution | Source |
|---|---|---|
| Software Glitch | Dealer flashes DASM with TSB 08-279-25 or 08-280-25 | |
| Blocked Radar Sensor | Clean the front fascia/bumper and the windshield area | |
| 12V Battery Failure | Dealer replaces the weak 12V battery | |
| Environmental Factors | Clean the windshield; wait for conditions to improve |
Frequently Asked Questions (FAQ)
What does the “Adaptive Cruise Control Unavailable” error mean?
It means your car’s radar or camera sensors can’t read the road ahead. This is often caused by a software bug, a blocked sensor, or a weak 12V battery. The system won’t re-engage until the problem is fixed .
Is there a recall for this issue?
There isn’t a safety recall, but Dodge has released Technical Service Bulletins (TSBs) that address it. A TSB is an official repair procedure for known issues .
Can I fix this myself?
You can try cleaning the front bumper and the windshield. If that doesn’t work, the fix typically requires a dealer software update that you cannot perform yourself .
How much does it cost to get the software update?
The update is performed under warranty if your vehicle is within the warranty period. If you’re out of warranty, you would be responsible for the diagnostic and service fee .
Will a weak battery cause the cruise control to fail?
Yes. Owners have reported that a faulty 12V battery can cause a host of electrical issues, including the cruise control error. Replacing the battery and updating the system often resolves the problem .
Does rain or snow cause the error?
Yes, heavy rain, snow, or fog can temporarily block the sensor. The system is designed to shut off in these conditions as a safety precaution .
Sources and Official Resources:
- DOT.report: TSB 08-279-25
- DOT.report: TSB 08-280-25
- Dodge Hornet Owners Forum
- 2024 Dodge Hornet Owner’s Manual
Have you dealt with this adaptive cruise issue on your Hornet? Did a software update finally fix it, or was it something else? Share your experience in the comments—other owners want to know what actually works!
