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VE SV6 Commodore - “Safe Mode” Issues

Skyhawk

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This post refers to my Holden VE SV6 Commodore (MY07) Sedan.

Over the past four months, my SV6 has experienced numerous shut downs, where the following warnings are illuminated:
• Check Engine
• Safety Mode Active
• Power Reduced
• Stability Ctrl Off
⚠️ (In this order) ⚠️

Twelve months ago, when the first shut down into “safe mode” occurred; the problem was identified as a stretched timing chain.
This was subsequently replaced (inc. new cogs etc).

Everything went well for about nine months.
Then new error-codes began to appear, which firstly indicated that the throttle body (sensor) needed to be replaced, followed shortly thereafter, by the throttle/pedal position sensor.

After travelling a single 620km highway drive (without any issues), the vehicle again shut down in “safe mode”!

The vehicle was inspected by my usual mechanic and a specialist technician. The decision was made to send the ECU to Melbourne for a more comprehensive diagnostic test.
Aside from detecting some corrosion on the zinc pins, the ECU was found to be in good condition. Errors could not be replicated ‘on the bench.’

The ECU was reinstalled into the vehicle and test driven. No faults could be replicated on the road drive.

The vehicle performed well for about two weeks. Then, one afternoon, I reversed out of my driveway and then engaged ‘Drive’ on the automatic transmission. As I applied pressure to the throttle pedal, the vehicle again entered “safe mode”!!

I am at a complete loss to understand what is causing this continual problem?
The vehicle is now back with my mechanic.

Does anyone have a confirmed diagnosis about what is happening?

Thanks in advance.
 

Skylarking

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Fault codes are probably more relevant than the text messages themselves as multiple fault codes could result in the same message being displayed or the car going into limp mode :rolleyes:

However, I have a vague recollection of reading that VE ESC warning issues could be due to wiring faults in the rear loom going to the right rear ABS sensor ;) (I think it was VE :rolleyes:)

Other than that vague recollection, sorry I can’t help.
 

Skyhawk

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Fault codes are probably more relevant than the text messages themselves as multiple fault codes could result in the same message being displayed or the car going into limp mode :rolleyes:

However, I have a vague recollection of reading that VE ESC warning issues could be due to wiring faults in the rear loom going to the right rear ABS sensor ;) (I think it was VE :rolleyes:)

Other than that vague recollection, sorry I can’t help.

I appreciate the reply. Thank you.
This is another option to consider.
I certainly had not thought of this.
In my mind, the issue must certainly be electrical?
 

mechanic

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In my mind, the issue must certainly be electrical?
Not necessarily. The electrical system is detecting a fault, but the actual fault could be mechanical/external.

For example, if the throttle butterfly was meeting resistance through excessive carbon, a tight pivot pin or a stuck object, the system would go to safe mode.
If there were metal shavings from abnormal wear in a wheel hub area that were magentised to the ABS sensor, the system would detect a fault.
If the tone wheel on the crankshaft had slipped slightly, the ECU would indicate a cam/crank correlation error.

Each of these faults were caused by a mechanical defect, but the integrity of the electrical system is perfectly intact. No amount of sensor replacements or ECU reprogramming would resolve these errors.
 

Skyhawk

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Not necessarily. The electrical system is detecting a fault, but the actual fault could be mechanical/external.

For example, if the throttle butterfly was meeting resistance through excessive carbon, a tight pivot pin or a stuck object, the system would go to safe mode.
If there were metal shavings from abnormal wear in a wheel hub area that were magentised to the ABS sensor, the system would detect a fault.
If the tone wheel on the crankshaft had slipped slightly, the ECU would indicate a cam/crank correlation error.

Each of these faults were caused by a mechanical defect, but the integrity of the electrical system is perfectly intact. No amount of sensor replacements or ECU reprogramming would resolve these errors.

That makes a great deal of sense
Thank you for taking the time to respond.

I am not a mechanic/technician, so to me, the fault appeared to be electrical in nature.

It is becoming an exercise in extreme frustration. I just want to know what the problem is?
 
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