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Audi Forum: Audi A8 4.0 TDI gearbox problem
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Old 10-20-2009, 03:23 AM
Eints77 Eints77 is offline
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Join Date: Oct 2009
Posts: 3
Default Audi A8 4.0 TDI gearbox problem

Hello! English is not my native language, and I use a translation program for assistance and I hope that you understand what I write.

Audi A8 4.0 TDI 2003
When the engine reaches operating temperature, the gear box does not change and the engine will work half power. Transmission dounīt have trouble codes.
Transmission ECU:
Display group 002:
Display zone 1: Current gearshift program 1-45.
whenever transmission goes to an emergency mode shows 47. Can not find the matches for this. Shift programme for Tiptronic function working properly.
Engine ECU gives intake manifold runner control fault. Do not believe that it is a problem. If anyone has ideas to help solve the problem, let me know
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Old 10-29-2009, 07:57 AM
Eints77 Eints77 is offline
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Join Date: Oct 2009
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I found a solution to the problem Fuel temperature goes above the permitted limit. Fuel temperature sender seems to be ok. I tried second sensor and the temperature was the same. Today I will try to identify the cause of the overheating of the fuel.
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Old 10-30-2009, 04:42 AM
Eints77 Eints77 is offline
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Join Date: Oct 2009
Posts: 3

Problem was in crushed main fuel pipe under the body and because fuel pressure was low, someone had the fuel filter backflow valve re-done to compensate for the lack of fuel pressure. And so became the hot fuel to recycle.
After the defect elimination is fuel temperature 45c when engine coolant temperature is 85c. Before was fuel temperature almoust same with engine coolant temperature. The maximum permissible temperature of the fuel is 70c.
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Old 04-11-2014, 04:51 AM
Tony Aucoin Tony Aucoin is offline
Join Date: Mar 2014
Posts: 71

I think its got one problem that is diesel because if your pick is good then your gear box is working good position and also weak points are the gearbox and suspension ball joints.are you realized that suspension ball is behave in good manner?

Last edited by Tony Aucoin; 04-11-2014 at 05:14 AM.
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