Q: When weather gets hot, SUV randomly won't start

asked by on

My SUV will randomly not start when the weather gets warmer. All of the following shut off: brake light, ABS light, security light, and radio. After waiting for 20-30 minutes, then my SUV will start. I have replaced the following: fuse block, ECM Module & reprogram, switch key Vincut key, BCM module (twice), mass air flow sensor. Plus, reprogrammed the security system (twice), greased the ground wires, and grease on terminals fuse block. I’ve been to the dealership and to two mechanic shops and have spent a lot! My car has not been fixed yet! What is your diagnosis and can you suggest what is causing the problem?

Hello. This sounds like an issue that would be difficult to diagnose online without inspecting the vehicle. I’m thinking that if you have replaced the ECM module and reprogrammed it, as well and the BCM module, fuse block, and mass airflow (MAF) sensor, it is possible that the engine wiring harness may have broken or frayed wiring, which is causing this intermittent problem.

If the coolant temperature sensor is sending the wrong reading to the ECM, it is also a possibility that the coolant temperature sensor could be faulty and causing this problem as well. A temperature reading that is incorrect may cause the ECM to make incorrect adjustments for the fuel/air mixture which may cause hard starts. I would suggest that you have a certified technician, like one from YourMechanic, come and inspect your vehicle to make a proper diagnosis on your car’s no-start.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. When weather gets hot, SUV randomly won't start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: It won't start and the ECU is not found by scanner.

Hi there. First check the battery and make sure that there is 12.6 volts. If the battery is low, then the battery will need charged before testing again. Check the wiring from the battery to the fuse box and make...

Q: I think my car battery died, but im not sure.

Hi there. It seems that the security system has came on and lock out your vehicle from starting. If you open the door and the dome light comes on with a good solid light and the headlights work, then the...

Q: My 2013 chey impala ltz reads engine idle and trans hot what do I need to do to stop this from happening and my trans is not shift

The overheating of the transmission might be due to it being stuck in too low a gear for the vehicle speed. The transmission in your car is electronically controlled and uses a transmission pressure control solenoid which occasionally fails. The...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...