The Stop/Start technology undoubtedly has many advantages, but it also has certain drawbacks. Sometimes it can fail as well. The most common problem is the – Stop Start Not Ready Cabin Cooling or Heating – error on the dashboard. The issue occurs mainly when cabin cooling or heating is in progress and an acceptable cabin temperature has yet to be reached. The Start/Stop system analyzes the proper interior cabin temperature against the outside temperature before activating.
There are a host of criteria that prevent the Stop/Start system from shutting the engine off or turning it back on. The system is programmed to prevent from activating until specific criteria are met. In that case, your Jeep might stop abruptly or not start automatically.
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What is a Stop/Start System?
A Stop/Start system shuts down the engine and restarts it automatically. It reduces the engine’s running time. Enabling the system saves fuel and helps lower emissions. By default, it activates when the engine starts and shuts down the engine briefly whenever you come to a stop. A green Stop/Start system icon on your dashboard means the system is active.
It’s environmentally friendly. Also, your Jeep has some key improvements in the engine, starter, and battery system to handle the wear and tear of additional engine starts. Start-stop technology will come with every new car now that the government is pushing for fuel economy with new rules and regulations. The system can save 3–10% of fuel for non-electric cars, even as much as 12%.
The Stop/Start system will engage when –
- You stop the Jeep completely,
- Put the shifter in forward gear and
- Press the brake pedal.
The engine will automatically shut down. The airflow from climate control might also decrease. Before shutting down the engine, the system checks all the conditions. Once you put your foot down on the accelerator, the engine will restart automatically. Sometimes, when the cabin temperature is too hot or too cold, the engine starts automatically to keep the temperature at optimum.
Reasons Behind Stop Start Not Ready Cabin Cooling or Heating – Error and Their Respective Solutions:
1. The cabin temperature that is set has yet to be reached because the cooling or heating is in progress:
If you live in an area where the winters are freezing or the summers are scorching, the cabin temperature can become out of range for the Start/Stop system to work. Then you will see the “Stop/Start Not Ready: Cabin Cooling or Heating” warning on the dashboard screen. It will work once the cabin temperature has climbed up/down to the temperature you have set. You can tinker with your cabin temperature to see which one works. This issue will only arise in harsh weather. It won’t persist or come in when the weather is nice. If it does, then you might have problems like those mentioned below.
2. When climate control is in full defrost mode:
If your climate control is set to full defrost mode at high blower speed, then the Stop/Start system won’t work. It is one of those conditions that deactivates the system.
Turn it down or turn off the full defrost mode.
3. When max A/C is enabled:
You might not have noticed that your max A/C is enabled in your climate control. If max A/C is enabled, then the Stop/Start system won’t engage. It is one of those conditions that prevents the system from engaging.
Turn down the A/C to standard settings. After that, the system should work.
4. Faulty climate control system:
A malfunctioning climate control system will fail to set the cabin temperature properly. Hence, the warning message will appear on your screen.
The climate control system in your car could break down for several different reasons. You should check if the fuses are blown or not. Then check your coolant level. Also, check its condition to see if it’s dirty or not. After that, check the fans. You should find the cause.
Some Other Issues that Might be Causing the Particular Problem:
1. Problem with the battery or charging:
If you have a battery problem, many issues are bound to arise. When you are checking your battery,
- Ensure that the battery is properly fitted.
- Make sure the cable connections to the terminals are nice and tight by twisting them.
- Check to see if the terminals are not clogged with dirt or corroded, as this will result in a poor connection.
- Check the battery charging level with and without the engine running.
- Load-test the battery if you see no charging issues.
If your battery is indicating a power deficiency, it must be changed.
2. Downgraded/Broken sensors:
Your car’s Stop/Start system relies heavily on the data from many different sensors. If it receives incorrect data, then it won’t activate.
To check your sensors, review the data provided by them with the scanner.
You can easily check your cabin temperature sensor with a multimeter. Then check the engine temperature sensor next.
Perform a complete check-up on your vehicle’s other sensors using the same approach if you can. If all other car sensors are okay, it’s possible the problem is with the Stop/Start system or the engine.
3. Malfunctioning ECU:
The ECU controls your vehicle’s electronic systems. If it is not functioning correctly, it might disrupt the cabin temperature system, resulting in a warning appearing on the dashboard.
There are various probable causes of an ECU failure. Faulty software or calibration errors mostly contribute to this failure. These problems can cause cabin climate control issues.
4. Engine problems:
Lastly, engine issues could prevent your car’s Stop/Start system from activating. Make sure your engine doesn’t have issues that include–
- Ignition problems
- Worn parts
If you see a yellow icon when the car is stopped, it means you have an issue that might require dealer service.
How do You Turn off the Stop/Start System?
As soon as the engine starts, the Stop/Start system turns on automatically. Manually shutting it off requires pressing the Stop/Start switch. System OFF is indicated by the illuminated switch light. If you press the button again, the switch light will turn off. Now the system is back in automatic mode.
Because there have been notable issues with the Stop/Start system, people get frustrated and look for solutions. There are some intelligent plug & play devices on the market. They eliminate the need to disable the system every day manually. The device remembers your preference for the auto start-stop functionality. Be careful when you consider using any of them.
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The warning message, Stop/Start Not Ready: Cabin Cooling or Heating can appear because of mechanical or electrical issues. But most of the time, its cause is the climate control system. Check out the cabin climate control system and follow the instructions detailed above. Probably the best idea is to bring your vehicle to a trustworthy technician and troubleshoot to see if there are any underlying issues if the problem persists.