Auto Stop Scewed Up
Thread Starter
Member
Joined: Sep 2021
Posts: 59
Likes: 27
From: New Hampshire
Auto Stop Scewed Up
Yesterday in traffic the auto start failed to restart, had to put it in park and push start! It only happened once. Any one else have this happen to them? No codes!
Senior Member
Joined: Mar 2021
Posts: 4,792
Likes: 2,393
There is a battery voltage monitor that will inhibit the auto stop start function if it detects a voltage too low by a limit set in program.
If the vehicle has been driven short distances to many times, the Battery has slowly lost it's average charge to below the low limit.
It is a function limit and allows for manual restarting before the Battery is too low on charge.
How you use the vehicle for drive cycles makes a large difference to the use of auto stop start function.
A Battery delivers a huge amount to power in a short time but requires a long time to recover it by Alternator recharge.
.
If there was a fault otherwise a code would be set.
There are more than 20 subparts to this function that could fail.
Each one has it's own code.
For example the Transmission has an electric pump that must power up. If it fails, the vehicle will have some issue, so would inhibit the auto start. On a manual restart, the normal pump is powered by engine cranking so your would not be left stranded.
This is why you got an early warning of auto start failure.
.
No doubt your Battery state of charge got to low.
Advice is to switch off the auto start function and allow the system enough time to keep the Battery up. In town stop starts too many times can be a problem or too many in a line waiting for some service like a Hamburger and Coffee etc...
There is only so far you can string this along before the Battery average charge falls below the monitor limit.
And your in NH temps to make matters even more difficult.
Good luck.
If the vehicle has been driven short distances to many times, the Battery has slowly lost it's average charge to below the low limit.
It is a function limit and allows for manual restarting before the Battery is too low on charge.
How you use the vehicle for drive cycles makes a large difference to the use of auto stop start function.
A Battery delivers a huge amount to power in a short time but requires a long time to recover it by Alternator recharge.
.
If there was a fault otherwise a code would be set.
There are more than 20 subparts to this function that could fail.
Each one has it's own code.
For example the Transmission has an electric pump that must power up. If it fails, the vehicle will have some issue, so would inhibit the auto start. On a manual restart, the normal pump is powered by engine cranking so your would not be left stranded.
This is why you got an early warning of auto start failure.
.
No doubt your Battery state of charge got to low.
Advice is to switch off the auto start function and allow the system enough time to keep the Battery up. In town stop starts too many times can be a problem or too many in a line waiting for some service like a Hamburger and Coffee etc...
There is only so far you can string this along before the Battery average charge falls below the monitor limit.
And your in NH temps to make matters even more difficult.
Good luck.
Last edited by Bluegrass; Dec 23, 2023 at 02:53 PM.
Thread Starter
Member
Joined: Sep 2021
Posts: 59
Likes: 27
From: New Hampshire
There is a battery voltage monitor that will inhibit the auto stop start function if it detects a voltage too low by a limit set in program.
If the vehicle has been driven short distances to many times, the Battery has slowly lost it's average charge to below the low limit.
It is a function limit and allows for manual restarting before the Battery is too low on charge.
How you use the vehicle for drive cycles makes a large difference to the use of auto stop start function.
A Battery delivers a huge amount to power in a short time but requires a long time to recover it by Alternator recharge.
.
If there was a fault otherwise a code would be set.
There are more than 20 subparts to this function that could fail.
Each one has it's own code.
For example the Transmission has an electric pump that must power up. If it fails, the vehicle will have some issue, so would inhibit the auto start. On a manual restart, the normal pump is powered by engine cranking so your would not be left stranded.
This is why you got an early warning of auto start failure.
.
No doubt your Battery state of charge got to low.
Advice is to switch off the auto start function and allow the system enough time to keep the Battery up. In town stop starts too many times can be a problem or too many in a line waiting for some service like a Hamburger and Coffee etc...
There is only so far you can string this along before the Battery average charge falls below the monitor limit.
And your in NH temps to make matters even more difficult.
Good luck.
If the vehicle has been driven short distances to many times, the Battery has slowly lost it's average charge to below the low limit.
It is a function limit and allows for manual restarting before the Battery is too low on charge.
How you use the vehicle for drive cycles makes a large difference to the use of auto stop start function.
A Battery delivers a huge amount to power in a short time but requires a long time to recover it by Alternator recharge.
.
If there was a fault otherwise a code would be set.
There are more than 20 subparts to this function that could fail.
Each one has it's own code.
For example the Transmission has an electric pump that must power up. If it fails, the vehicle will have some issue, so would inhibit the auto start. On a manual restart, the normal pump is powered by engine cranking so your would not be left stranded.
This is why you got an early warning of auto start failure.
.
No doubt your Battery state of charge got to low.
Advice is to switch off the auto start function and allow the system enough time to keep the Battery up. In town stop starts too many times can be a problem or too many in a line waiting for some service like a Hamburger and Coffee etc...
There is only so far you can string this along before the Battery average charge falls below the monitor limit.
And your in NH temps to make matters even more difficult.
Good luck.
