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Old 05-11-2014, 05:01 PM   #1
yourmyboybh1026
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Default Code p1289

So after I installed my Roush, I got this code. I read it with my SCT and it said "Cylinder head temp sensor high input". Does anyone know the cause?
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Old 05-11-2014, 05:40 PM   #2
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You installed your Roush what?
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Old 05-11-2014, 06:56 PM   #3
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TVS supercharger.
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Old 05-11-2014, 08:37 PM   #4
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Looks like it could be the cylinder temp sensor, which I think I had to some of the wires going to that, so maybe something happened.
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Old 06-12-2014, 10:25 PM   #5
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Your temp sensor is either unplugged or has a bad connection/ broken wire. It's probably under that pretty new supercharger.
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Old 06-13-2014, 02:20 PM   #6
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I had this happen with my KB. The bottom of the intake manifold contacts the top of the cylinder head temp sensor. The wire gets pinched, the car thinks it's overheating, goes into limp mode and your screwed.

Two solutions:

Order new and different sensor, trim the top plastic so it doesn't contact. Problem solved.

Trim the sensor you have, repair wire.

I replaced the old one with complete new wire and sensor as the broken wire was nearly impossible to fix and be sure it was fixed correctly due to it being to close to the plastic.


The sensor is located in the front left side of the valley under the manifold.
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Old 06-13-2014, 05:36 PM   #7
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Quote:
Originally Posted by Simon1 View Post
I had this happen with my KB. The bottom of the intake manifold contacts the top of the cylinder head temp sensor. The wire gets pinched, the car thinks it's overheating, goes into limp mode and your screwed.

Two solutions:

Order new and different sensor, trim the top plastic so it doesn't contact. Problem solved.

Trim the sensor you have, repair wire.

I replaced the old one with complete new wire and sensor as the broken wire was nearly impossible to fix and be sure it was fixed correctly due to it being to close to the plastic.


The sensor is located in the front left side of the valley under the manifold.
That sucks!
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Old 06-14-2014, 08:26 AM   #8
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Quote:
Originally Posted by Simon1 View Post
I had this happen with my KB. The bottom of the intake manifold contacts the top of the cylinder head temp sensor. The wire gets pinched, the car thinks it's overheating, goes into limp mode and your screwed.

Two solutions:

Order new and different sensor, trim the top plastic so it doesn't contact. Problem solved.

Trim the sensor you have, repair wire.

I replaced the old one with complete new wire and sensor as the broken wire was nearly impossible to fix and be sure it was fixed correctly due to it being to close to the plastic.


The sensor is located in the front left side of the valley under the manifold.
Well, I'll try to take a look at that. I may just take my car to a shop since I have a lot of other problems I want to get fixed and I just don't have the time to do all of it.

One question though, would this problem cause my coolant temp gauge to stop working? Or is that something else?

When my car is warm, the temp gauge will work for a few seconds, but then just quit.
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Old 06-15-2014, 04:10 PM   #9
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Don't know about that.

The gauges do have defaults they go to based on historical readings. Not exactly sure how it works, but the sensor will need to be fixed before you can really diagnose the gauge.
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Old 06-15-2014, 09:00 PM   #10
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Quote:
One question though, would this problem cause my coolant temp gauge to stop working? Or is that something else?
there may be more than one temperature sensor. Historically, the coolant temp sensor was placed near the thermostat, and any auxiliary sensors like in the cylinder head were there as "overheat" sensors.The heads are what run the hottest so a sensor there would sound the alarm that you're overheating before you ran the risk of engine damage.
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Old 06-15-2014, 09:00 PM
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