Coolant sensor circuit problem-code 15, coolant temperature reads 299 degrees all the time
Thread Starter
2nd Gear
Joined: Apr 2003
Posts: 2
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From: Pittsburgh PA
Coolant sensor circuit problem-code 15, coolant temperature reads 299 degrees all the time
My wifes vette was overheating last month, so I replaced the thermostat. It ran great for about a week, but now when the car starts the service engine soon light comes on[/img] Report this to a moderator DoInsert(' :confused: '); (code #15)
[/img] Report this to a moderator DoInsert(' :confused: '); and the coolant temperature reads 299 degrees all the time, although the car does not overheat anymore. I was wondering if anyone had any good ideas about what this might be.
I would assume that it is the coolant temperature sensor that is faulty. Last year I replaced the coolant fan temp. sensor (on the passenger side of the engine). I know very little about electrical circuits & testing. Also, since I just spent over $1000 to replace the ratty old seats in her car, I have no $$$$ left to go to a mechanic this year unless it is a christmas present. Would replacing the coolant temperature sensor be a reasonable 1st step or do I have more serious problems?
thanks, Vince
[/img] Report this to a moderator DoInsert(' :confused: '); and the coolant temperature reads 299 degrees all the time, although the car does not overheat anymore. I was wondering if anyone had any good ideas about what this might be.
I would assume that it is the coolant temperature sensor that is faulty. Last year I replaced the coolant fan temp. sensor (on the passenger side of the engine). I know very little about electrical circuits & testing. Also, since I just spent over $1000 to replace the ratty old seats in her car, I have no $$$$ left to go to a mechanic this year unless it is a christmas present. Would replacing the coolant temperature sensor be a reasonable 1st step or do I have more serious problems?
thanks, Vince
Le Mans Master
Joined: Dec 2000
Posts: 7,839
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From: San Diego, Ca
Re: Coolant sensor circuit problem-code 15. . .
Temp gauge and the coolant sensor temp giving you the 15 are two different things. The 15 usually means the wiring is open at the sensor. It's below the throttle body, threaded into the manifold. Yellow is the 5 volt reference signal and you should see five volts if you measure between the terminals in the connector. Gauge sender is on the right cylinder head between #6 & #8 and a constant 299 usually means that the sender is shot. Disconnect it. If it reads low, replace the sender. If it doesn't read low, there's either a short to ground in the signal wire or it's in the cluster. If you do replace the sender, take the old one with you and make sure they give you the right one. In my experience, the parts person confuses it with the coolant temp sensor and I've ended up with the wrong part.
