01 2.7t

Find someone with a vag-com and ask them to reset you codes.

Tonytomasi

any updates because mine is doing the same thing?!

PetrolBear

I experienced all these while my alternator was dying - at it also killed slowly the 2 years old battery. Insufficiend charging means a slow battery deep excharge. 11-ish or ad idling a 12ish means insufficient charge rate! OR: dashboard value is false - check the charging AT the battery, compare with the dashboard. There might not be a greater drop than 0,3-0,4 volts. If more, oner or more contacts are bad. At this age, the battery cable to body or engine can be oxidized / green rusty. There can fall even 0,8 volt.
Check alternator charge, the battery itself (not by a handy meter, but by a load tester in a shop, how many DIN Ah capable it is) and the cables which are crucial.
Check for later modifications by pre owners..

After alternator and battery replacement, I did not need to erase any codes for a proper operation.

Normal values at the dashboard:
Idling cold: 14 < ... 14,3
Idling warm: 13,7-13,9
Idling under load: AC panel ON, ECO button is OFF, so AC goes on: 13<
Idling when compressor kicks in: -0,2-0,3 volt
Battery in when very sulfated or 50% dischared (at cranking points with voltmeter): 12,4 - 12,2
Battery at good condition and 100% charged (at cranking points with voltmeter): 12,7


A constant lower voltage involves
- secondary pump low rpm - OBD error, MIL
- improper ride height values at wheel sensors
- At enduring too weak voltages, the level control modula module can "feeze down" or can go bad! Beware on these symptoms. Allroad is a complicated car with sofisticated extras. It rides not only on petrol but on electricity as well.

shxuila

Hi everyone,

I have a same issue, after I recently replaced battery on my Allroad C5 2004 and I get issue with charging,
On warm start it charges OK about 13.7--13.9 v , but after A/C is on it drops to 12.3-12.4 v at 800 RPM, at 1500-2000 it goes up to 12.6-12.8 max

Do I need to be worried?

Coast2Coast

Has anyone stopped and checked the starter 12V+ connection? I would put money that we got some burnt insulation or maybe some loose wires (@ flag terminal on 12V+ starter connection) with some of these cars.
terminal 30 i believe.