Audi A5 2.0 TFSI Coolant system issues
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1st Gear
Joined: Jul 2019
Posts: 4
From: Nottingham
Audi A5 2.0 TFSI Coolant system issues
Hi all,
Looking to see if anyone can advise on some next steps to solving my issue?
Car: Audi A5 2.0 tfsi black edition quattro B8 on 63 plate engine code CNCD 53K miles on clock.
All started some weeks back when i got a start stop error on dash. Said start stop disabled due to fault and revs would be limited to 4000rpm. Ignition On/off got rid of the fault and i drove home 170 miles no issues. Few days later i kept getting same issue and later go an engine check light. Since the car was due a service I asked Audi to take a look. They reported that there was a coolant actuator needed replacing (they pointed out which one on a video they send) and recommended a full coolant change. Since they wanted £1000 for this work i decided it was something i could do myself. Whilst waiting for the parts i was still driving the car an then noticed another issue, engine temp reading 0 despite having just completed a long drive (100+ miles). Ordered a replacement actuator and flushed coolant system (drained old, flushed with 5lt of deionised water and refilled with new + burped system). I also ordered myself a cheap OBD scanner in order to further investigate the temp gauge issue.
Once scanner arrived I read 3 faults.
P2681 Coolant bypass valve cont circuit / open
P2556 Coolant low level sensor / switch circuit
P0116 Coolant temp sensor circuit range / perf
I cleared these faults expecting to only have the P0116 remain since the gauge was still playing up. It was sometimes reading 70 deg or 0 and changes during a long drive despite the car not stopping. I'd also assumed that the coolant low level might have been triggered when i was flushing and burping the system during coolant change.
To my surprise the only fault which keeps returning is the P2556 coolant level sensor?
Last weekend I changed the coolant temp sensor - the one on the engine block which i believe talks to the dash and i also removed the coolant reservoir tank, disconnected the elec clip and blasted with contact cleaner. It did look pretty corroded and i also gave it a good scrape with a pointy tool. Cleared all faults again, took on a long drive but nothings changed. Still got engine check light for P2556 and still got an indecisive engine temp gauge on dash.
Possible next steps:
Change coolant bottle for new, change other temp sensor at radiator end (forgot to mention than fan is on constantly), swallow my pride and take it back to Audi - despite having done everything they said already. What else could i check or do???? Help!!!!
Had a quote from another garage who said they want £50+vat for a proper VAG scan. Would that be of any use? Whats weird is that despite still having a dodgy temp gauge i'm getting no new error codes for it?
Looking to see if anyone can advise on some next steps to solving my issue?
Car: Audi A5 2.0 tfsi black edition quattro B8 on 63 plate engine code CNCD 53K miles on clock.
All started some weeks back when i got a start stop error on dash. Said start stop disabled due to fault and revs would be limited to 4000rpm. Ignition On/off got rid of the fault and i drove home 170 miles no issues. Few days later i kept getting same issue and later go an engine check light. Since the car was due a service I asked Audi to take a look. They reported that there was a coolant actuator needed replacing (they pointed out which one on a video they send) and recommended a full coolant change. Since they wanted £1000 for this work i decided it was something i could do myself. Whilst waiting for the parts i was still driving the car an then noticed another issue, engine temp reading 0 despite having just completed a long drive (100+ miles). Ordered a replacement actuator and flushed coolant system (drained old, flushed with 5lt of deionised water and refilled with new + burped system). I also ordered myself a cheap OBD scanner in order to further investigate the temp gauge issue.
Once scanner arrived I read 3 faults.
P2681 Coolant bypass valve cont circuit / open
P2556 Coolant low level sensor / switch circuit
P0116 Coolant temp sensor circuit range / perf
I cleared these faults expecting to only have the P0116 remain since the gauge was still playing up. It was sometimes reading 70 deg or 0 and changes during a long drive despite the car not stopping. I'd also assumed that the coolant low level might have been triggered when i was flushing and burping the system during coolant change.
To my surprise the only fault which keeps returning is the P2556 coolant level sensor?
Last weekend I changed the coolant temp sensor - the one on the engine block which i believe talks to the dash and i also removed the coolant reservoir tank, disconnected the elec clip and blasted with contact cleaner. It did look pretty corroded and i also gave it a good scrape with a pointy tool. Cleared all faults again, took on a long drive but nothings changed. Still got engine check light for P2556 and still got an indecisive engine temp gauge on dash.
Possible next steps:
Change coolant bottle for new, change other temp sensor at radiator end (forgot to mention than fan is on constantly), swallow my pride and take it back to Audi - despite having done everything they said already. What else could i check or do???? Help!!!!
Had a quote from another garage who said they want £50+vat for a proper VAG scan. Would that be of any use? Whats weird is that despite still having a dodgy temp gauge i'm getting no new error codes for it?
Last edited by Damaudi; Jul 23, 2019 at 04:46 PM. Reason: Typos and missing info
Thread Starter
|
1st Gear
Joined: Jul 2019
Posts: 4
From: Nottingham
Yes. It turned out to be the thermostat. Ended up getting it sorted at an approved Audi garage, not Audi dealership but still it cost £1300 I think. Thermostat housing had failed which apparently can be a common fault. Once it was off you could see while residue on it. The part itself was around £375 but lot of labour as it’s tucked away and is a huge unit, it just a little mercury filled valve like the old school ones.
Hope
you get it sorted mate
Hope
you get it sorted mate
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