Map controlled thermostat fault code

[Trev]

17701 - Map controlled engine cooling thermostat (F265): Short to plus
P1293 - 001 - Upper limit exceeded


This DTC keeps coming up. Any ideas as to what may be the cause?

I'm guessing thermostat needs to be replaced? Just wanted to confirm with you guys first. This doesn't seem to be a common issue. Most people just replace them when they start to leak...

[POPO]

You need to replace the thermostat housing with sensor. The sensor is bad. I just did mine the other day. When I took the thermostat housing out the sensor was all corroded. Ordered mine through Europaparts, like 80 bucks. There is also a writeup on how to change the housing which is spot on.

[juttin3]

You need to replace the thermostat housing with sensor. The sensor is bad. I just did mine the other day. When I took the thermostat housing out the sensor was all corroded. Ordered mine through Europaparts, like 80 bucks. There is also a writeup on how to change the housing which is spot on.

is it possible when i flushed coolant last month i screwed this up? will this damage car driving with this code?

Control Module Part Number: 8E0 909 518 BC
Component and/or Version: 1.8L R4/5VT G

0010
Software Coding: 0016751
Work Shop Code: WSC 13873
1 Fault Found:
17700 - Map Controlled Engine Cooling Thermostat

(F265): Open Circuit
P1292 - 004 - No Signal/Communication -

[DownhillA4]

17701 - Map controlled engine cooling thermostat (F265): Short to plus
P1293 - 001 - Upper limit exceeded


This DTC keeps coming up. Any ideas as to what may be the cause?

I'm guessing thermostat needs to be replaced? Just wanted to confirm with you guys first. This doesn't seem to be a common issue. Most people just replace them when they start to leak...

You need to replace the thermostat housing with sensor. The sensor is bad. I just did mine the other day. When I took the thermostat housing out the sensor was all corroded. Ordered mine through Europaparts, like 80 bucks. There is also a writeup on how to change the housing which is spot on.

Just vag-com'd my car tonight and got...

Engine:
17701
P1293

So I should change the thermostat housing, engine coolant temperature sensor behind the engine and their is another right next to the thermostat? So I should order 2 green coolant temp sensors?

[old guy]

The thermostat has a heater, not a sensor. MAP controlled thermostat There are two sensors. The green four pin sensor on the back of the motor and the gray 2 pin sensor in the lower radiator hose.

[Kodymfk]

This could also cause high rpm at idle due to the t stat giving incorrect readings and or making the car think its constantly in warm up mode? I got this map controlled code but also noticed higher rpm at idle. My car is hanging around 1000 rpm now. When I kick on my a/c, it drops it back down to below 1000 rpm at idle.

[fla]

i have the same error code - can the green sensor be replaced to rectify this or as above does the whole thermostat need to be changed? Is there a link to the thread to swop it out?

[old guy]

i have the same error code - can the green sensor be replaced to rectify this or as above does the whole thermostat need to be changed? Is there a link to the thread to swop it out?

Green sensor won't cause a mapped thermostat code. Here's a DIY for the t-stat: Clicky click

Thanks to Matt

[Kodymfk]

The sensor in the t stat can't be removed. I think it may be a blue one, or a green one. I tried before sucking it up and buying the whole t stat unit for 100+$.

[old guy]

The sensor in the t stat can't be removed. I think it may be a blue one, or a green one. I tried before sucking it up and buying the whole t stat unit for 100+$.

The thermostat doesn't have a sensor. It has a heater that the ECM uses to force the thermostat open sooner than the normal mechanical opening temperature.

[Kodymfk]

The thermostat doesn't have a sensor. It has a heater that the ECM uses to force the thermostat open sooner than the normal mechanical opening temperature.

Ahh, I see. Ya, I had the same code. Tried to replace just the sensor or mechanical item connected to piece. Found out that wasn't possible and replaced the whole unit. Been good to go since.

[fla]

Green sensor won't cause a mapped thermostat code. Here's a DIY for the t-stat: Clicky click

Thanks to Matt

As usual great info, thanks OG. What would be the effect on running this with the fault as I wont have time to do this for a few weeks :( ?

[customa4]

http://www.autohausaz.com/search/pro...200@Thermostat

[old guy]

As usual great info, thanks OG. What would be the effect on running this with the fault as I wont have time to do this for a few weeks :( ?

You should be OK. The mechanical portion of the thermostat should still function. You have just lost the ECM's ability to open it sooner under high load conditions. just drive your car gently (no excessive full throttle runs) and you should be fine. You may notice your cooling fans running more than usual but that's about it.

[caluma4x4]

You should be OK. The mechanical portion of the thermostat should still function. You have just lost the ECM's ability to open it sooner under high load conditions. just drive your car gently (no excessive full throttle runs) and you should be fine. You may notice your cooling fans running more than usual but that's about it.

I know this is an old thread but can the blue sensor on the thermostat housing part be changed on it's own or not?

[old guy]

I know this is an old thread but can the blue sensor on the thermostat housing part be changed on it's own or not?

It is not a sensor on the map controlled thermostat. It is a heater embedded in the wax element that actuates the thermostat opening. It gives the ECM the ability to apply power to the heating element and force the thermostat to open under specific conditions. If you unplug the heater the thermostat will continue to function as a high temperature thermostat. No it is not replaceable.

[caluma4x4]

It is not a sensor on the map controlled thermostat. It is a heater embedded in the wax element that actuates the thermostat opening. It gives the ECM the ability to apply power to the heating element and force the thermostat to open under specific conditions. If you unplug the heater the thermostat will continue to function as a high temperature thermostat. No it is not replaceable.

Thank you old guy, I have to get this part replaced soon, I did change the J plug whenI got the car as it was leaking. The car did run very warm one day, I think that has killed the heating element in the thermostat.
The cooling fans never ran so I suspect the relay, can you point me to it's location at all, thanks again for your help.

On further searching it's more likely to be the fan controle module, a common fault apparently.

[old guy]

T The car did run very warm one day, I think that has killed the heating element in the thermostat.
The cooling fans never ran so I suspect the relay, can you point me to it's location at all, thanks again for your help.

On further searching it's more likely to be the fan control module, a common fault apparently.

Running hot wouldn't hurt the heating element in the thermostat. If it overheated while driving it would more likely be the thermostat sticking. If it overheats at idle that could indicate a bad fan or fan control module.

[caluma4x4]

Running hot wouldn't hurt the heating element in the thermostat. If it overheated while driving it would more likely be the thermostat sticking. If it overheats at idle that could indicate a bad fan or fan control module.

I refilled and bled the system and it hasn't done it again since, just the fault code for the thermostat 17701 short to plus, upper limit exceeded. Will change it as soon as I can
Thanks old guy.

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[Halvis]

Hi, old guy. I have an A4 1.8t With two issues/problems that bothers me.
first: A coolant flange that leaks, (new one ordered and will be replaced soon)
second: High rpm at idle (more frequent when Engine is warm).

The coolant temp is stable around 90degrees so theres no problem with the thermostat.

When i do the scan i get:
P1292 Map Controlled Engine Cooling Thermostat (F265): Open Circuit
P0507 Idle Control System RPM: Higher than Expected.

My first question:
Do you think the p0507 fault code is caused by the P1292 fault code? (as mentioned by Kodymfk) or do you Think the code is set by something else. E.g vacuum leakage ?

second question:
The fault code p1292. How accurate is error detection? Could it be anything other than the MAP controlled thermostat that could be faulty. In addition to cables and items connected to MAP controlled thermostat.I do not want to change MAP if it is not necessary, after all it costs a little money.

my idea was to change coolant flange and maybe order a MAP!??, replace both, and hope it solves my two problems. If the idle problem does not go away then I have to start looking for vacuum leakage. If you have any other suggestions, I am grateful for answers

[old guy]

The P1292 is a pretty specific code. You have an open circuit to the thermostat heater. It's either the heating element is burned out or you have a faulty plug or broken wire. The element is pretty easy to check. Just check for continuity across the element. If you have continuity on the heating element the problem will be somewhere in the wiring to the element.

The P0507 is most likely being caused by a vacuum leak somewhere. With the engine at idle clamp off the vacuum hoses one at a time that are connected to the intake manifold. If clamping one of them causes a reduction in the idle speed you will know where to look for the leak.

[Halvis]

Ok. Thanks! Gonna measure the connector to the heating element, probably/hopefully the fault is in the heater...then do some fault isolation on the vacuum hoses.


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[Halvis]

I measured the heating element in the MAP Thermostat and I got endless resistance so I guess it is short circuit there. I decided not to do anything about it because the thermostat works anyway and it doesn't leak.
I also inspected the PCV valve (035 103 245) and found that it was broken, it has now been replaced and the car's idle works perfectly

[BumblebVR6]

I had the P1293 code a while back and replaced the whole thermostat assembly. A few months later, and the code keeps popping up again. Has anyone had similar issues?

[kwilson]

I had the P1293 code a while back and replaced the whole thermostat assembly. A few months later, and the code keeps popping up again. Has anyone had similar issues?

What brand did you use?

[BumblebVR6]

What brand did you use?

Mahle or HT brand from ECS I believe.


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[kwilson]

I've read that there have been many problems with the aftermarket thermostats. I only use genuine thermostats, and have never had a problem.

[BumblebVR6]

I've read that there have been many problems with the aftermarket thermostats. I only use genuine thermostats, and have never had a problem.

I’m thinking the same thing. I have a low mileage oem thermostat I removed from my other motor. I think I’ll use that on the new motor I’m building or get new oem. Thanks.


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