Engine Oil Temperature Fluctuation

[Jacobwilliamshort]

I have a 2021 VW T6.1.
My oil engine temperature will intermittently start fluctuating and not settle on a temperature. This resulted in the engine management light (the coil warning light) coming on, on one occasion, and the start stop and ACC being disabled.
However, leaving the vehicle overnight seems to rectify the issue. I may not have any symptoms for a couple days.
The vehicle drives fine even with symptoms.
I took it to the garage and the only code showing up is a torque management system code: P00AF00.
Any thoughts on the cause of the issue? A faulty sensor maybe? Or a software issue?

 

[manfrotto]

How are you measuring the oil temperature?
If you are getting the engine management light coming on, there should be a fault code stored which may help with a diagnosis

 

[Bigsidavies]

How much and how quickly does it fluctuate? Mine changes all the time. As i pull uphill and wind on some power I can see it climb from 98 to 108 fairly sharpish then drop back to 100 as it levels out. It doesn't stay constant like the water temp gauge.

 

[mmi]

P00AF00

P00AF 00 = Actuator Module for Turbocharger 1- Stuck

Post in thread 'DTC Code : P00AF'

7 Nov 2023

More precisely: P00AF = Actuator Module for Turbocharger 1- Stuck

Not knowing which engine you've got - please check the actuator itself, control valve+associated wiring, vacuum tubing between them.

a sensor issue rather than something more due to how it resets after turning off ?

The ECU "clears" the warning light at every ignition turn off/on - hence it seemingly resets.

• mmi

• 

 

[Jacobwilliamshort]

How are you measuring the oil temperature?
If you are getting the engine management light coming on, there should be a fault code stored which may help with a diagnosis

I am reading the oil temperature off the digital gauge on the Instrument Cluster.
I think the only one stored was the torque management system code, unless the mechanic failed to mention another.
I'll have to get hold of a fault reader and check myself.

 

[Jacobwilliamshort]

P00AF 00 = Actuator Module for Turbocharger 1- Stuck

Post in thread 'DTC Code : P00AF'

7 Nov 2023

More precisely: P00AF = Actuator Module for Turbocharger 1- Stuck

Not knowing which engine you've got - please check the actuator itself, control valve+associated wiring, vacuum tubing between them.

a sensor issue rather than something more due to how it resets after turning off ?

The ECU "clears" the warning light at every ignition turn off/on - hence it seemingly resets.

• mmi

• 

Many thanks, those are very similar symptoms. Would you recommend the same solution (diesel additive cleaner)? Or investigate the Actuator as you specified first?
The engine code is the following: DNAB
I am by no means experience in this, apologies.

 

[Jacobwilliamshort]

How much and how quickly does it fluctuate? Mine changes all the time. As i pull uphill and wind on some power I can see it climb from 98 to 108 fairly sharpish then drop back to 100 as it levels out. It doesn't stay constant like the water temp gauge.

It's fluctuates rapidly, regardless of driving conditions (5-20c in a couple seconds). It normally sits comfortably on a temperature if conditions are uniform, and will change slowly due to changes in driving conditions.

 

[Bigsidavies]

It's fluctuates rapidly, regardless of driving conditions (5-20c in a couple seconds). It normally sits comfortably on a temperature if conditions are uniform, and will change slowly due to changes in driving conditions.

Deffo not normal then. Maybe a temp sensor issue.

 

[Jacobwilliamshort]

Deffo not normal then. Maybe a temp sensor issue.

I'm hoping that's the case, just strange that it's so intermittent. In your experience do you think a sensor failure could cause the other symptom I mentioned?

 

[Bigsidavies]

I don’t know enough to even guess about that.

 

[mmi]

I took it to the garage and the only code showing up is a torque management system code: P00AF00.

Well, such an interpretation a kind of suggests the garage doesn't have proper tools for VAG fault finding and thus quite possibly can't read manufacturer specific fault codes - e.g. oil level/temperature sensor codes. Below just an example of T6.

Post in thread 'U1019 Oil sensor location help!'

3 Dec 2023

I would start untangling the issue by doing some more diagnostics before crawling under the van.

1) To be precise -

U1019 00 [035] - Missing Signal for Oil Level/Temperature - [Instrument cluster control module - Missing signal oil level/temperature]​

According to the code it's the Instrument cluster missing the signal, not (necessarily) the engine itself (where the sensor actually connects)​

2) To verify the sensor itself is well and alive -

The sensor can be read directly via engine controller - the following should/could be checked for plausibility​

Oil temperature -...​

• mmi

• 

It's fluctuates rapidly, regardless of driving conditions (5-20c in a couple seconds).

Possibly a wiring, or the sensor itself, issue - thus intermittently cutting offmor shorting the connection. The dash display is heavily damped down so can't conclude much of it.

A

Post in thread 'U1019 Oil sensor location help!'

3 Dec 2023

Found a cut harness! Now fixed and U1019 has gone… the original oil pressure switch DTC has come back though AARRGGHH!!!

• Andy302

• 

Does the engine have bottom cover or is all the wiring easily accessible to e.g rodents?

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Could anyone help with identifying this small mud flap / aero part?
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• StuartRB
• Replies: 4
• Forum: Exterior Styling, Bodywork & Detailing

do you think a sensor failure could cause the other symptom

Not likely.

Would you recommend the same solution (diesel additive cleaner)? Or investigate the Actuator as you specified first?

Fuel additive won't help. The turbo actuator needs attention. Also a proper diagnostic tool would be more helpful.