Coolant Sensor Fault P0117
Thread Starter
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
Coolant Sensor Fault P0117
Yes sir Mr. Moderator! Please be lenient with me since this is my first citation in 22 years as a CF Member. 
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Quote:
Originally Posted by BIGMAC View Post
Please look at the picture. My code is P0117. This code was thrown during a total overheating episode. DIC was displaying multiple doomsday messages and car went into reduced power mode. Could the sensor failure cause all this hell to break loose?
Quote:
Posted by C5 Diag (Moderator)
Oh, YOU have this DTC ??…I could not tell what you were inferring with your picture…can you start a NEW thread with your issue instead of hijacking this thread…it makes it less confusing between the two…thanks !!…we can address your issue at that time !!
**************************************** **************************************** **************************************** ********
Quote:
Originally Posted by BIGMAC View Post
Please look at the picture. My code is P0117. This code was thrown during a total overheating episode. DIC was displaying multiple doomsday messages and car went into reduced power mode. Could the sensor failure cause all this hell to break loose?
Quote:
Posted by C5 Diag (Moderator)
Oh, YOU have this DTC ??…I could not tell what you were inferring with your picture…can you start a NEW thread with your issue instead of hijacking this thread…it makes it less confusing between the two…thanks !!…we can address your issue at that time !!
Last edited by BIGMAC; Dec 1, 2022 at 08:23 AM. Reason: typo
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,621
Likes: 4,069
From: Cape Coral, Florida
Yes sir Mr. Moderator! Please be lenient with me since this is my first citation in 22 years as a CF Member.
**************************************** **************************************** **************************************** ********
Quote:
Originally Posted by BIGMAC View Post
Please look at the picture. My code is P0117. This code was thrown during a total overheating episode. DIC was displaying multiple doomsday messages and car went into reduced power mode. Could the sensor failure cause all this hell to break loose?
Quote:
Posted by C5 Diag (Moderator)
Oh, YOU have this DTC ??…I could not tell what you were inferring with your picture…can you start a NEW thread with your issue instead of hijacking this thread…it makes it less confusing between the two…thanks !!…we can address your issue at that time !!
**************************************** **************************************** **************************************** ********
Quote:
Originally Posted by BIGMAC View Post
Please look at the picture. My code is P0117. This code was thrown during a total overheating episode. DIC was displaying multiple doomsday messages and car went into reduced power mode. Could the sensor failure cause all this hell to break loose?
Quote:
Posted by C5 Diag (Moderator)
Oh, YOU have this DTC ??…I could not tell what you were inferring with your picture…can you start a NEW thread with your issue instead of hijacking this thread…it makes it less confusing between the two…thanks !!…we can address your issue at that time !!
!!…I’m assuming the car didn’t ACTUALLY overheat because it wouldn’t have thrown that DTC…the 0117 is a low circuit code which can either be a faulty sensor or the 5 volt reference circuit is shorted to ground…remove the ECT sensor connector and see if the temp goes to 100 degrees or full cold…you may have to clear the code…if it does the 5 volt reference is not shorted…you can check for 5 volts with a DVOM…when the ECM “thinks” the car is overheating you’ll see the REP because the ECM will start to shut off fuel injectors to keep the engine temp down.
Last edited by C5 Diag; Dec 1, 2022 at 09:14 AM.
Thread Starter
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
OK, I’ll let you slide this time but don’t let it happen again…LOL
!!…I’m assuming the car didn’t ACTUALLY overheat because it wouldn’t have thrown that DTC…the 0117 is a low circuit code which can either be a faulty sensor or the 5 volt reference circuit is shorted to ground…remove the ECT sensor connector and see if the temp goes to 100 degrees or full cold…you may have to clear the code…if it does the 5 volt reference is not shorted…you can check for 5 volts with a DVOM…when the ECM “thinks” the car is overheating you’ll see the REP because the ECM will start to shut off fuel injectors to keep the engine temp down.
!!…I’m assuming the car didn’t ACTUALLY overheat because it wouldn’t have thrown that DTC…the 0117 is a low circuit code which can either be a faulty sensor or the 5 volt reference circuit is shorted to ground…remove the ECT sensor connector and see if the temp goes to 100 degrees or full cold…you may have to clear the code…if it does the 5 volt reference is not shorted…you can check for 5 volts with a DVOM…when the ECM “thinks” the car is overheating you’ll see the REP because the ECM will start to shut off fuel injectors to keep the engine temp down.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,621
Likes: 4,069
From: Cape Coral, Florida
If the engine actually overheated it would not throw that DTC…was coolant actually boiling over…what did you visually see that made you think it was overheating ???…it is a circuit code you are seeing which is wiring related or a sensor…with that DTC I would expect to see the cooling fans run…that code is telling the ECM the engine is hot not cold.
Thread Starter
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
If the engine actually overheated it would not throw that DTC…was coolant actually boiling over…what did you visually see that made you think it was overheating ???…it is a circuit code you are seeing which is wiring related or a sensor…with that DTC I would expect to see the cooling fans run…that code is telling the ECM the engine is hot not cold.
Driver info cluster showing multiple waring messages about high coolant temps
Engine on reduced engine power
Steam coming from cap on coolant reservoir
Abnormally high underhood temp
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,621
Likes: 4,069
From: Cape Coral, Florida
If that was the case you have 2 problems…the DTC and an actual overheat…you’ll have to chase your overheat first and then look at the circuit….like I said remove the ECT connector and see if the coolant temp changes on the gauge and DIC or check for 5 volts on one of the 2 wires…can’t remember the wire color off the top of my head…you may have to clear the DTC….that’s all I got !!
