Gianni Tritella - May 2, 2025
The Start&Stop system is a technology designed to reduce fuel consumption and emissions during urban driving. However, on the new Jeep Avenger 1.2 Mild Hybrid , many owners have reported frequent malfunctions , making this function unstable or completely unusable. In this article, we analyze in detail the causes, symptoms, and possible solutions related to Start&Stop system problems in the Jeep Avenger, focusing on the 2024-2025 model year.
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🔎 What is the Start&Stop system and how should it work?
The Start&Stop system automatically switches off the engine when the car is stationary (for example at traffic lights), and restarts it as soon as the driver releases the brake (cars with automatic transmission) or presses the clutch (cars with manual transmission).
In the Jeep Avenger Mild Hybrid with 1.2 turbo three-cylinder engine, the system is combined with:
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Enhanced battery
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Environmental sensors
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Electronic control unit that manages the ignition/off switch
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BSG (Belt Starter Generator) system
⚠️ Common Start-Stop System Problems on the Jeep Avenger
Numerous users and authorized workshops have reported recurring problems, including:
1. The system does not activate
The vehicle remains on even under normal stopping conditions. No error lights appear, but the Start&Stop system never engages.
2. Random activations or delays in re-starting
The engine stalls, but restarting is slow or delayed , causing discomfort when restarting.
3. Start&Stop failure lights on the dashboard
Sometimes the message appears:
“Start&Stop not available. Recharge battery,” even when the battery appears to be charged.
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🔍 Most common causes of malfunction
✅ 1. Insufficient battery charge
The system is very sensitive to the battery charge level . If the battery drops below a minimum threshold, the system automatically deactivates for safety.
✅ 2. Engine or passenger compartment temperature
Start&Stop may not work if:
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the engine is too cold
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the passenger compartment requires intense air conditioning (priority to comfort)
✅ 3. Faulty sensors or incorrect readings
Problems with the temperature, clutch, or brake sensors can cause the system not to activate.
✅ 4. BSG control unit problems
The electric motor that manages the engine restart may not work correctly or may have drops in performance.
✅ 5. Faults in the Start&Stop electronic module
Some documented cases speak of software bugs or intermittent ECU failures, which can only be resolved with workshop updates.
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🛠️ Possible solutions and practical advice
✔️ Check the battery status
Even if new, the battery may not be 100% charged or suitable for start-stop systems. Workshops can perform tests with professional tools.
✔️ Check for errors via OBD diagnostics
An electronic test can detect faults in sensors or the control unit that do not yet generate a visible warning light.
✔️ Software updates at authorized workshops
Some issues have been fixed via firmware update , especially in the 2023-2024 models.
✔️ Do not force it to work
If the system does not activate, it is not always a malfunction: it could be a temporary limitation related to safety or environmental parameters.
❗When to contact support
We recommend that you contact the official Jeep workshop if:
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The error message appears often
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The system never works, even after long journeys
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Noticeable delays in restarting the engine
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You replaced the battery but the problem persists
📝 Conclusion
The Start&Stop system on the Jeep Avenger is a useful solution for reducing fuel consumption, but requires optimal conditions to function properly . Malfunctions can depend on various factors, from the battery to the sensors, and often do not indicate a serious fault , but simply an automatic protection of the system.
The key is: monitor, perform regular maintenance and don't ignore the vehicle's signals .
🔎 Frequently Asked Questions (FAQ)
🔧 Can the Jeep Avenger's Start&Stop system be deactivated manually?
Yes, via a button on the center console.
🔋 Can I install any battery in a Jeep Avenger with Start&Stop?
No, you need a specific AGM or EFB battery for Start&Stop systems.
🧠 Is it normal for the system not to activate when the air conditioning is on?
Yes, if the car detects that it needs to cool or heat the passenger compartment, it deactivates Start&Stop to maintain comfort .
🛠️ Where can I get an electronic diagnostic on my Jeep Avenger?
At authorized Jeep workshops or specialized mechanics with advanced OBD II instrumentation.
