Restricted Performance/ Auto Start Stop
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Member
Joined: Jul 2023
Posts: 81
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From: Warner Robins, Georgia
Restricted Performance/ Auto Start Stop
Recently I have been having some intermittent issues with "Restricted Performance" when I start my car and have recently noticed that every time RP is highlighted on the dash, my auto start/stop is not lit up like normal? I started to pay close attention to see if I was actually hitting the button too early in the process, I drive with it deactivated, but the RP warning comes on AT START UP. I'm doing some research now, but honestly, I am not sure where to start and I haven't seen anyone else with this issue. If anyone can help, I'd greatly appreciate it. Wanted to drive it to work this morning and couldn't leave the driveway.
2017 SVR
No Modifications
Check Engine Light is on due to O2 Sensor replacement
2017 SVR
No Modifications
Check Engine Light is on due to O2 Sensor replacement
Veteran Member
Joined: Feb 2014
Posts: 9,021
Likes: 3,658
From: Adelaide, South Australia
There are a whole slew of conditions/problems which will cause stop/start not to work and I am fairly sure that RP is one of them.
So RP is the cause of SS not working and not the other way around, and you need to find the cause of the RP.
It might be connected to the CEL/O2 sensor issue or it might not, RP usually needs a bigger problem than that before it is triggered.
First port of call is a full code scan and see what comes up.
So RP is the cause of SS not working and not the other way around, and you need to find the cause of the RP.
It might be connected to the CEL/O2 sensor issue or it might not, RP usually needs a bigger problem than that before it is triggered.
First port of call is a full code scan and see what comes up.
Thread Starter
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Member
Joined: Jul 2023
Posts: 81
Likes: 22
From: Warner Robins, Georgia
Thanks OZ, I will take a look at it when I get home tonight and see what all of the codes are. I've got the sensors on the way since the Jag dealer is 2 hours away and slow as the day is long when it comes to warranty appointments..
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Joined: May 2013
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From: Metrowest Boston
From the Workshop Manual…
OPERATION - VEHICLES WITH STOP/START SYSTEM
At the beginning of a drive cycle, when the Stop/start switch is operated, the Auto stop/start system
operates in the same way as on vehicles without stop/start.
The Auto stop/start system is controlled by the ECM and the GWM (Gateway Module) via HS CAN
powertrain systems bus messages and signals from other system components and modules to
determine the correct conditions for system operation. The Auto stop/start system detects when it is
appropriate to stop and start the engine.
Before the engine is stopped the following parameters must be detected:
The vehicle must be stopped from a speed greater than 4 km/h (2.5 mph)
Sufficient brake pressure must be applied to the brake pedal to ensure the vehicle is stationary
OR
The vehicle must be stationary and 'P' or 'N' selected on the TCS (AT equipped vehicles)
The vehicle must be stationary and 'N' selected on the MT.
Before the engine is restarted, the following parameters must be detected:
The accelerator pedal is pressed (ECM detects a signal from the APP (Accelerator Pedal Position)
sensor)
The vehicle speed exceeds approximately 1 km/h (0.5 mph)
Climate control system demand increases (signal from the ATCM (Automatic Temperature Control
Module))
Brake vacuum has been reduced from repeated use of brake pedal with engine not running
(detected by ECM from the brake vacuum sensor)
Battery charge becomes low
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch is operated to select a gear
'D' (Drive) or 'S' (Sport) selected on the TCS and the brake pedal is released
'R' (Reverse) is selected on the TCS
The following conditions will prevent an Auto stop:
The external ambient temperature is less than 0°C (32°F) (detected by the ECM via the AAT
(Ambient Air Temperature) sensor)
The external ambient temperature is more than 40°C (104°F) (detected by the ECM via the AAT
sensor)
The engine has not reached its optimum operating temperature (detected by the ECM via the ECT
(Engine Coolant Temperature) sensor)
The driver door is opened (detected by the CJB from the door ajar switch)
The driver safety belt is not fastened (detected by the RCM (Restraints Control Module) from the
driver seatbelt buckle switch)
The climate control system requires the engine to be running, for example; windshield demist
selected
The battery charge is low (signal from the GWM)
The hood is open (detected by the CJB from the hood ajar switch)
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch has been used to select a gear (vehicles with AT)
At the beginning of a drive cycle, when the Stop/start switch is operated, the Auto stop/start system
operates in the same way as on vehicles without stop/start.
The Auto stop/start system is controlled by the ECM and the GWM (Gateway Module) via HS CAN
powertrain systems bus messages and signals from other system components and modules to
determine the correct conditions for system operation. The Auto stop/start system detects when it is
appropriate to stop and start the engine.
Before the engine is stopped the following parameters must be detected:
The vehicle must be stopped from a speed greater than 4 km/h (2.5 mph)
Sufficient brake pressure must be applied to the brake pedal to ensure the vehicle is stationary
OR
The vehicle must be stationary and 'P' or 'N' selected on the TCS (AT equipped vehicles)
The vehicle must be stationary and 'N' selected on the MT.
Before the engine is restarted, the following parameters must be detected:
The accelerator pedal is pressed (ECM detects a signal from the APP (Accelerator Pedal Position)
sensor)
The vehicle speed exceeds approximately 1 km/h (0.5 mph)
Climate control system demand increases (signal from the ATCM (Automatic Temperature Control
Module))
Brake vacuum has been reduced from repeated use of brake pedal with engine not running
(detected by ECM from the brake vacuum sensor)
Battery charge becomes low
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch is operated to select a gear
'D' (Drive) or 'S' (Sport) selected on the TCS and the brake pedal is released
'R' (Reverse) is selected on the TCS
The following conditions will prevent an Auto stop:
The external ambient temperature is less than 0°C (32°F) (detected by the ECM via the AAT
(Ambient Air Temperature) sensor)
The external ambient temperature is more than 40°C (104°F) (detected by the ECM via the AAT
sensor)
The engine has not reached its optimum operating temperature (detected by the ECM via the ECT
(Engine Coolant Temperature) sensor)
The driver door is opened (detected by the CJB from the door ajar switch)
The driver safety belt is not fastened (detected by the RCM (Restraints Control Module) from the
driver seatbelt buckle switch)
The climate control system requires the engine to be running, for example; windshield demist
selected
The battery charge is low (signal from the GWM)
The hood is open (detected by the CJB from the hood ajar switch)
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch has been used to select a gear (vehicles with AT)
Thread Starter
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Member
Joined: Jul 2023
Posts: 81
Likes: 22
From: Warner Robins, Georgia
I just noticed that the start/stop has not been coming on when the RP is shown? I haven't thought about the process since the car is at home. i'll look at that when I get there and see if that fixes the problem. Thank you for the option.
Senior Member
Joined: Aug 2020
Posts: 863
Likes: 616
From: Western MA
The following conditions will prevent an Auto stop:
The external ambient temperature is less than 0°C (32°F) (detected by the ECM via the AAT
(Ambient Air Temperature) sensor)
The external ambient temperature is more than 40°C (104°F) (detected by the ECM via the AAT
sensor)
The engine has not reached its optimum operating temperature (detected by the ECM via the ECT
(Engine Coolant Temperature) sensor)
The driver door is opened (detected by the CJB from the door ajar switch)
The driver safety belt is not fastened (detected by the RCM (Restraints Control Module) from the
driver seatbelt buckle switch)
The climate control system requires the engine to be running, for example; windshield demist
selected
The battery charge is low (signal from the GWM)
The hood is open (detected by the CJB from the hood ajar switch)
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch has been used to select a gear (vehicles with AT)
(Ambient Air Temperature) sensor)
The external ambient temperature is more than 40°C (104°F) (detected by the ECM via the AAT
sensor)
The engine has not reached its optimum operating temperature (detected by the ECM via the ECT
(Engine Coolant Temperature) sensor)
The driver door is opened (detected by the CJB from the door ajar switch)
The driver safety belt is not fastened (detected by the RCM (Restraints Control Module) from the
driver seatbelt buckle switch)
The climate control system requires the engine to be running, for example; windshield demist
selected
The battery charge is low (signal from the GWM)
The hood is open (detected by the CJB from the hood ajar switch)
Auto stop/start is deactivated using the Auto stop/start switch in the floor console.
A steering wheel paddle switch has been used to select a gear (vehicles with AT)
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Thread Starter
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Member
Joined: Jul 2023
Posts: 81
Likes: 22
From: Warner Robins, Georgia
No outcome yet. I am still trying to figure it out, but I do know that the AUTO STOP/START has something to do with it. Every time I start the car, and it lights up, the car runs perfectly. However, when it goes out on start-up, the restricted performance still comes on. The only codes that I am getting are for the O2 sensors that need to be replaced. I am thinking about taking it to the Jag dealer to diagnose the O2 sensors and replace and hopefully it will happen to them why it's there.
Senior Member
Joined: Mar 2023
Posts: 155
Likes: 61
From: Grimsby, ON
No outcome yet. I am still trying to figure it out, but I do know that the AUTO STOP/START has something to do with it. Every time I start the car, and it lights up, the car runs perfectly. However, when it goes out on start-up, the restricted performance still comes on. The only codes that I am getting are for the O2 sensors that need to be replaced. I am thinking about taking it to the Jag dealer to diagnose the O2 sensors and replace and hopefully it will happen to them why it's there.
Veteran Member
Joined: Feb 2011
Posts: 3,918
Likes: 2,524
From: Victoria, Canada
The problem(s) is (are) most likely caused by a battery not fully charged. As has been pointed out, the battery charge is the first item to verify with ANY malfunction since virtually every aspect of the car is governed by interconnected modules. When they do not receive full charge, their malnutrition is evidenced by weak or non-existent behaviour. Battery FIRST!
Thread Starter
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Member
Joined: Jul 2023
Posts: 81
Likes: 22
From: Warner Robins, Georgia
The problem(s) is (are) most likely caused by a battery not fully charged. As has been pointed out, the battery charge is the first item to verify with ANY malfunction since virtually every aspect of the car is governed by interconnected modules. When they do not receive full charge, their malnutrition is evidenced by weak or non-existent behaviour. Battery FIRST!
OKAY FOR EVERYONE IN THE BACK........ THE BATTERY WAS CHECKED WITH A FULL CHARGE BEFORE I POSTED ON HERE. And just to make sure that I did it properly, I took it to an independent shop and had them verify everything.
Veteran Member
Joined: May 2012
Posts: 2,557
Likes: 503
From: Boston, MA USA
Did you disconnect the auto stop start as mentioned above? It's a simple cable unplug in the trunk. That way you can isolate if it's related to the auto stop start
I also have a 2017 SVR. Disconnected my start stop when I got the car 5 years ago and it has never caused any issues
If you disconnect and still get your RP error then you know it's something else
But a you should prob get the O2 sensors replaced first anyway. Jag will go them under extended emissions warranty (think still valid on yours, I got one done a couple of years ago). It's possible that if an O2 sensor is far from parameters it doesn't just give an error but trips RP too?
I also have a 2017 SVR. Disconnected my start stop when I got the car 5 years ago and it has never caused any issues
If you disconnect and still get your RP error then you know it's something else
But a you should prob get the O2 sensors replaced first anyway. Jag will go them under extended emissions warranty (think still valid on yours, I got one done a couple of years ago). It's possible that if an O2 sensor is far from parameters it doesn't just give an error but trips RP too?
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