Bad Transmission Temperature Sensor……?
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4th Gear
Joined: Oct 2014
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Bad Transmission Temperature Sensor……?
I have a 2001 6 cylinder F150 automatic with overdrive; the overdrive light started flashing awhile back when the shift lever **** came off due to a crack in the plastic. The truck has been running fine, no noticeable shifting problems. I ordered a replacement shift lever and installed it thinking that the old one may have shorted something. Light is still blinking. I took it to a transmission shop, they did a scan and took it for a test drive and agreed that it was running OK. They said that they got a code (I did not get the specific code) for a bad “Transmission Temperature Sensor” located in the pan, they would have to drop the pan to replace…..said it was reading way over normal temperature (8,850 F), but they also checked the dipstick while hot and said it did not feel overheated and there is no discoloration in the fluid. My question is this: Is there a “transmission temperature sensor” located in the pan? I have looked for such a part and cannot find one. Also they tried to erase the code and could not do it…said it was a “hard code”….Is there a difference between a “hard’ and “soft” code? Thanks in advance for any and all answers.
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Yes there is a temperature sensor on the valve body.
It is there to monitor temperature and to lock out OD until the fluid temperature comes up to about 100 degrees from a cold start.
The computer looks at it for over temperature and circuit continuity open, shorted or grounded..
The temperature reading by test equipment does not always mean the fluid is too hot .....if the sensor is faulty.
The code tells you there is an issue. Believe it. Better yet to know the code so it can be determined.
You had the code read but your no farther along than before with out the code number..
Good luck.
It is there to monitor temperature and to lock out OD until the fluid temperature comes up to about 100 degrees from a cold start.
The computer looks at it for over temperature and circuit continuity open, shorted or grounded..
The temperature reading by test equipment does not always mean the fluid is too hot .....if the sensor is faulty.
The code tells you there is an issue. Believe it. Better yet to know the code so it can be determined.
You had the code read but your no farther along than before with out the code number..
Good luck.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Very first sentence in my reply said the sensor is on the valve body.
Valve body bolted to the bottom of the trans and holds all the Solenoids and passages to direct the fluid flow.
Yes the pan has to be drained and removed to access the sensor and wire cable or ribbon cable.
.
However; the code says the circuit is open (high).
It could be the sensor is open.
This is often a ribbon cable or in some older transmissions a wire cable.
It could be an open in the cable or plug on the outside.
As stated it won't hurt anything but possibly not allow the trans to go into OD and not be able to report a real overheating condition should it occur.
Whoever works on the repair should be looking for an open circuit at some point.
It's not a big job but it has to have some disassembly to check it all out unless there is some luck involved and it becomes easy to find.
The Computer flashes the OD light to tell you there is an issue. The code tells you the nature of the issue.
Good luck.
Valve body bolted to the bottom of the trans and holds all the Solenoids and passages to direct the fluid flow.
Yes the pan has to be drained and removed to access the sensor and wire cable or ribbon cable.
.
However; the code says the circuit is open (high).
It could be the sensor is open.
This is often a ribbon cable or in some older transmissions a wire cable.
It could be an open in the cable or plug on the outside.
As stated it won't hurt anything but possibly not allow the trans to go into OD and not be able to report a real overheating condition should it occur.
Whoever works on the repair should be looking for an open circuit at some point.
It's not a big job but it has to have some disassembly to check it all out unless there is some luck involved and it becomes easy to find.
The Computer flashes the OD light to tell you there is an issue. The code tells you the nature of the issue.
Good luck.
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mybigredford
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