Omega Owners Forum

Please login or register.

Login with username, password and session length
Advanced search  

News:

Welcome to OOF

Pages: [1] 2  All   Go Down

Author Topic: P0115 Engine temp circuit malfunction  (Read 2132 times)

0 Members and 1 Guest are viewing this topic.

terry paget

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Midsomer Norton Somerset
  • Posts: 4633
    • 3 Astras 2 Vectra
    • View Profile
P0115 Engine temp circuit malfunction
« on: 22 November 2020, 11:27:40 »

2008 Astra 1.6 petrol manual saloon

Daughter has now found the diagnostic socket on her Astra, and the above fault code has been displayed.
It first appeared last Monday, with no apparent car problems. She used the car in the week, on Friday evening it started hesitantly, cranking slowly but starting eventually, she got it home and rang me. This morning she found the socket, and got the above fault. The engine did start this morning.

Before I expected either dying battery or failed alternator, not so sure now. I am in Somerset under lockdown, she is in Enfield, 120 miles away.

Please advise.
Logged

Nick W

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Chatham, Kent
  • Posts: 10836
  • Rover Metro 1.8VVC
    • 3.0l Elite estate
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #1 on: 22 November 2020, 11:34:27 »

Live data.


Start the car from cold, and watch how the sensor reading changes as the engine warms up. Check if the temp gauge uses a different sensor, and compare the changes. A cheap laser thermometer will give a rough idea of what the water temperature actually is at various points around the engine and cooling system. The lead on an OBD reader should be long enough to reach out of the door, although the Astra might only be enough to put it on the dash so it's visible through the windscreen


Inspect the wiring at and around the sensor, both visually and with a meter.


A new sensor isn't expensive if the wiring checks out OK.
« Last Edit: 22 November 2020, 11:36:16 by Nick W »
Logged

iansoutham

  • Senior Member
  • ****
  • Offline Offline
  • Gender: Male
  • SE London
  • Posts: 521
    • Omega 2.0 m/f/l est CDX
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #2 on: 22 November 2020, 14:13:58 »

Change the thermostat (comes with housing).  Common problem.

To confirm, if the live data of the temperature sensors show them both rising at similar rates (one on thermostat housing, one on radiator) this will confirm diagnosis.

There was a TSB for the wiring on some aircon models rubbing through but normally just the stat assembly.
Logged

terry paget

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Midsomer Norton Somerset
  • Posts: 4633
    • 3 Astras 2 Vectra
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #3 on: 22 November 2020, 15:48:08 »

Thank you gentlemen. The car is still running. I hoped on receiving the first phone call that the car would bring daughter home near Christmas, when I could repair it, but on Friday when it struggled to start I worried. From what you say it should still run until Christmas without intervention. Do you agree? Otherwise I should advise her to take it to a local garage.
Logged

dave the builder

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Derbyshire
  • Posts: 7760
    • omega b2 2.6 cdxi
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #4 on: 22 November 2020, 16:01:55 »

an overfueling issue could kill the cat ,a thermostat issue could take out the headgasket or worse
"warning lights are for a reason .not just till christmas"   ;D
Logged

terry paget

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Midsomer Norton Somerset
  • Posts: 4633
    • 3 Astras 2 Vectra
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #5 on: 22 November 2020, 16:25:49 »

an overfueling issue could kill the cat ,a thermostat issue could take out the headgasket or worse
"warning lights are for a reason .not just till christmas"   ;D
You infer I should send her to a local garage without delay. Some warning lights, e.g. emissions provoked, are just advisory, and go out after 25 or so engine restarts. I have known them for 20 years on many Senators and Omegas.
Logged

dave the builder

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Derbyshire
  • Posts: 7760
    • omega b2 2.6 cdxi
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #6 on: 22 November 2020, 16:34:51 »

an engine management light is an immediate MOT fail
an engine management light is there to warn the driver that there is an issue with the emission system and needs looking at BEFORE damage to the cat or engine occurs

does the temp gauge go up when the engine is warm ?
do the rad fans run constantly ,even when the engine is cold (if the CTS id dead or unplugged the ECU defaults to run the fans)

can you/your family member get live data on the code reader .if you can .follow Nicks advice  ;)


Logged

Nick W

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Chatham, Kent
  • Posts: 10836
  • Rover Metro 1.8VVC
    • 3.0l Elite estate
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #7 on: 22 November 2020, 17:07:02 »

Modern cars are a lot more reliant on sophisticated systems than older ones, and they're also a lot more delicate. They certainly don't take overheating at all well, so some proper diagnosis now should be a priority.



Logged

ronnyd

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Bury St Edmunds Suffolk
  • Posts: 8592
    • Vectra 1.8 SRI Silver
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #8 on: 22 November 2020, 17:19:26 »

2008 Astra 1.6 petrol manual saloon

Daughter has now found the diagnostic socket on her Astra, and the above fault code has been displayed.
It first appeared last Monday, with no apparent car problems. She used the car in the week, on Friday evening it started hesitantly, cranking slowly but starting eventually, she got it home and rang me. This morning she found the socket, and got the above fault. The engine did start this morning.

Before I expected either dying battery or failed alternator, not so sure now. I am in Somerset under lockdown, she is in Enfield, 120 miles away.

Please advise.
What lockdown is that Terry. Took SWMBO for an eye test today and traffic and car parks were busy as normal. I went for a walk away from the herd while she was in Specsavers and high tailed it home as soon as she finished. :D I suppose that Zummerzet to Middlesex , (showing my age there  ;))  may be stretching things a bit far though. :-\
Logged

dave the builder

  • Omega Lord
  • *****
  • Offline Offline
  • Gender: Male
  • Derbyshire
  • Posts: 7760
    • omega b2 2.6 cdxi
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #9 on: 22 November 2020, 17:24:24 »

Eye tests are classed as essential travel  :)  the police won't bat flu an eye lid   :-X
Also car repairs  ;)
Logged

Doctor Gollum

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • In a colds and darks puddleses
  • Posts: 28089
  • If you can't eat them, join them...
    • Feetses.
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #10 on: 22 November 2020, 17:29:53 »

2008 Astra 1.6 petrol manual saloon

Daughter has now found the diagnostic socket on her Astra, and the above fault code has been displayed.
It first appeared last Monday, with no apparent car problems. She used the car in the week, on Friday evening it started hesitantly, cranking slowly but starting eventually, she got it home and rang me. This morning she found the socket, and got the above fault. The engine did start this morning.

Before I expected either dying battery or failed alternator, not so sure now. I am in Somerset under lockdown, she is in Enfield, 120 miles away.

Please advise.
What lockdown is that Terry. Took SWMBO for an eye test today and traffic and car parks were busy as normal. I went for a walk away from the herd while she was in Specsavers and high tailed it home as soon as she finished. :D I suppose that Zummerzet to Middlesex , (showing my age there  ;))  may be stretching things a bit far though. :-\
It doesn't look that far on the map :D
Logged
Onanists always think outside the box.

Nick W

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Chatham, Kent
  • Posts: 10836
  • Rover Metro 1.8VVC
    • 3.0l Elite estate
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #11 on: 22 November 2020, 17:34:22 »

2008 Astra 1.6 petrol manual saloon

Daughter has now found the diagnostic socket on her Astra, and the above fault code has been displayed.
It first appeared last Monday, with no apparent car problems. She used the car in the week, on Friday evening it started hesitantly, cranking slowly but starting eventually, she got it home and rang me. This morning she found the socket, and got the above fault. The engine did start this morning.

Before I expected either dying battery or failed alternator, not so sure now. I am in Somerset under lockdown, she is in Enfield, 120 miles away.

Please advise.
What lockdown is that Terry. Took SWMBO for an eye test today and traffic and car parks were busy as normal. I went for a walk away from the herd while she was in Specsavers and high tailed it home as soon as she finished. :D I suppose that Zummerzet to Middlesex , (showing my age there  ;) )  may be stretching things a bit far though. :-\
It doesn't look that far on the map :D


Detour via Barnard Castle
Logged

Doctor Gollum

  • Get A Life!!
  • *****
  • Offline Offline
  • Gender: Male
  • In a colds and darks puddleses
  • Posts: 28089
  • If you can't eat them, join them...
    • Feetses.
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #12 on: 22 November 2020, 17:37:01 »

That might be a smidge further :D
Logged
Onanists always think outside the box.

Nick W

  • Omega Queen
  • *****
  • Offline Offline
  • Gender: Male
  • Chatham, Kent
  • Posts: 10836
  • Rover Metro 1.8VVC
    • 3.0l Elite estate
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #13 on: 22 November 2020, 17:38:39 »

But it does have government approval. For what that's worth
Logged

terry paget

  • Omega Baron
  • *****
  • Offline Offline
  • Gender: Male
  • Midsomer Norton Somerset
  • Posts: 4633
    • 3 Astras 2 Vectra
    • View Profile
Re: P0115 Engine temp circuit malfunction
« Reply #14 on: 22 November 2020, 18:57:38 »

Thanks for all advice. Answering your questions:

Astra has no temperature gauge. Catherine did not comment on the fans running from start up, but she would not have noticed.

She cannot read live data on her basic reader. I can on mine, but the car is not here.

Google Maps reckons it is 143 or 153 miles from Midsomer Norton to Enfield.

My wife has ruled that I must not drive there while under lockdown. When I had 6 Senators or 6 Omegas I would drive the spare one to Enfield when Catherine's car misbehaved. Now I run Astras and Merivas they are less reliable and I am older.

Are we all agreed that the fault is the thermostat, as IanSoutham believes? It makes sense to me. I have changed two on Merivas, not a big job. I don't know garages in Enfield, Catherine fancies Greenfox. Should I send her there, with instructions to change the thermostat, or ask them to diagnose the fault and rectify it, suggesting thermostat?
Logged
Pages: [1] 2  All   Go Up
 

Page created in 0.039 seconds with 21 queries.