Knowing details which trans or engine would help get more info

internal on the valve body,

No you sould NOT need a PCM or TCM just for a bad sensor.

 

@jtec

Apologizes rookie mistake, 5.7l Transmission is the 545rfe. You stated Internal on the valve body, so the valve body has to be replaced as well? Also I tried to do some research and I see valve bodies with and without the Solenoid Pack? I am not familiar with transmissions as I am with everything else.

 

whoa slow down - you have a code that does not mean change part it alerts a tech of an issue with in your case trans TOT. there is a trouble tree and tests for this P0218-HIGH TEMPERATURE OPERATION ACTIVATED.

TMI:
" The DTC is intended as an informational DTC to aid the technician in determining the root cause of a customer dirveability issue. The DTC is also intended to alert the technicain to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler is needed to support the customers driving behavior."

 

This is a known problem with the 545 trans. Some people have changed the solenoid pack which has the range sensor and pyrometer in it and some have found bad / oily contacts on the 23 pin trans connector or changed the PCM, but many never fix the issue. As JTEC said, I would definitely troubleshoot a little further first to try and find the source of this particular problem.

That said, ( if all else fails ) one confirmed fix some have done is to cut the signal wire that goes to the PCM. It doesn't affect anything because the PCM uses other sensors and an algorithm to then determine trans temp.
See post #4
2005 grand Cherokee

 

@yzjwk

Thank you for the information, I am 1200 miles away from the vehicle my 18 year old is driving and she does most of the repairs herself. It was taken to a local transmission repair shop, they verified the temp was at 160 degrees which I believe is normal? They did not charge anything for checking which I was surprised, and even recommended driving it until it started to act up then consider which repair to perform. Both myself and my daughter are not familiar with the Transmission, however we can handle Brakes, Plugs, speed sensors etc. just fine she enjoys working on the Jeep and I encourage her. I guess I got concerned since it was outside my knowledge scope. I see now from your comments and jtec that I need to slow down thank you both. I will send her the link to the thread as well so she can see the advice.

Mark

 

Is the transmission fluid fine, not burnt?
Are the temps actually OK - how were they measured at 160?
Is the weather getting warmer where the Jeep is?

jtec posted a helpful troubleshooting tree, I will also share my experience with the same transmission and error code

The same error code pops up on mine, usually when it's really hot out. Never in the winter. Using an OBD meter, I can see the transmission temp spike up for 1 sec to like 150 Celsius, trigger the warning, and then immediately drop back down to its normal temp of 70C or so. Measured temps with an infrared thermometer at the transmission body, also normal at 70c. So likely a fault sensor or electrical issue.

I had the transmission completely rebuilt for another issue. The over temp error still popped up. The transmission shop then replaced the solenoid that contains the temp sensor under warranty. Same issue. They found some damage to the transmission wiring harness and replaced it. Same issue. I even added an auxiliary transmission cooler - while this dropped the overall temps, it did nothing for the occasional error.

I just live with it now. From all my research, it's probably something to do with the PCM, bad contact or overheating. I added a 12V PC fan to blow air onto the PCM which seems to have helped but the real test will be in the summer.

 

The code being information AND no other codes - do some checking
My favorite boggie man - see attachment - the red arrow points at a bypass valve - POS causes problems cause low or no flow and can be intermittent in performance.

There is a Cooling filter in the trans, it SHOULD be a routine maintenance item also see diagram.

As mentioned the 23pin connector - clean, corrosion free.

With a scanner is there any info in freeze frame for P0218, the trans shoped checked temp* how did that compare to whatthe TCM see's as temp?e


* as mentioned above HOW did they check....

 

All good information

The code is very intermittent, last time this happened was two to three months ago, at the same time the battery went out. Replaced the battery and the code did not reappear, it popped back when I posted the original message but was cleared and since then has not reappered. I am not sure how they read the transmission temp. I am scheduled to return home for a week late April I have an Altel Scanner I can monitor transmission temp. with. I was unaware there is a screen/filter in the coolant line not sure if it was changed with regular maintenance or not, I do not recall seeing it on the invoice. Transmission has been maintained on regular intervals I do not allow a flush but insist on the pan dropped and filter changed.

Mark

 

do not dismiss my boggie man the bypass - as I said they F,up intermittently.

If your scanner allows viewing live data - just observe TOT (trans temp), if you can look at history and FREEZE frame.
When a code sets a snapshot of some data is stored to help tech diagnose. If no Hi temp indicated then clean the 23pin connector ESP if operated in deep water, snow environment. a spray 'DEOXIT' is my go to.

Check back when you have some time with scanner.

 

Will do and thank you again.

Mark

 

Finally got home and put the scanner on the Overland, scanner reports that the over temp was triggered two times @288f but nothing since then. It also reported that the temp. sensor voltage was within range (live data). This is my daughters DD so it driven as normal and not a garage queen. As many of you have suggested I will monitor and go from there. I appreciate the information and support.

@jtec if it sets again will see about the bypass as you mentioned, it appears that there is no way to check the bypass itself but just replace?

Thank you

Mark

 

@jtec

Put the Jeep on a lift and I do not see the By-Pass Valve toward the transmission as indicated in the diagram you provided with the Red Arrow, I also did an online search to see if needed that the part was available and I cannot find any reference that the 2006 Overland with the 545 transmission has a bypass valve on the cooler lines. Not saying you are incorrect but can you provide a part # so I can reference?

Appreciate it and Thank you

Mark

 

I Believe you - the book or your actual looking at the area.... seams the book (diagram) could be a generic diagram IDK....

But that's 1 thing to dismiss as a likely suspect....

 

Looking at trouble tree*next suspect - pump volume check - If anything comes to mind I will add info.

* trouble tree was vague on troubleshooting

 

Looking at trouble tree*next suspect - pump volume check - If anything comes to mind I will add info.

* trouble tree was vague on troubleshooting

@jtec

Thank you and appreciate any ideas from you or anyone else. I may drive it today with the data logger function enabled on my scanner (still learning how to use it) and see if I see any spikes in temps.

 

learn your scanner -

I am curious and if you can - find ECT, (engine coolant temp) AMB (ambient), IAT (Intake air) and trans fluid temp.

remember how to sccess - tomorrow before you get started driving - KOEO - check the temps. After a overnight they should all be @ same +- 5.... a 'correlation' is what I looking at... Basically if one is AFU we will need to see if that skews things esp Trans Temp - JUST a thought nothing but curiosity.

 

Dug deeper using the scanner and found a stored P0714 Intermittent Transmission Temp Sensor Voltage Detected. Also my first run with the Overland Yesterday from the Live Data:

Engine Coolant Temp: 200f
Transmission Oil Temp: 304
Ambient Temp: 65f

I missed the Intake Air Temp. will work on doing the second run today maybe tomorrow have to move my son from College today.

Mark

 

the idea is to compare BEFORE starting eng.... thats after the long OFF period overnight.

Now I will check and add about the P0714 and post later....

 

@jtec

Overland sat overnight

Transmission Oil Temp: -3
Transmission Cold: Yes
Transmission Very Cold: Yes
Ambient: 68f
Intake Temp: 68f
Coolant Temp: 68f

Will check tomorrow morning after it sits again overnight.

 

showing -3 is interesting.... would expect @68deg give or take a few but thats a wee bit off...

Will need to check somethong out and replay

 

Morning (depending on where everyone is)

Pulled data this morning.

Transmission Oil Temp: -3
Ambient: 71.2f
Intake Air Temp: 75.6f

Noticed that the Transmission High Temp Code P0218 and P0714 was set again (I cleared yesterday), after a drive. I pulled Event Data:

Transmission Oil Temp: 108f
Engine Coolant Temp: 180f

Seems a little low to be setting the Transmission High Temp event?

 

Very busy, And agree the temp is not a cause of a hi temp mode code....

Quiet does not mean I gave up - seams no or little time but will follow and add...

The reason I asked for the first thing in the AM before operation was to confirm temp was within reason - and the -3 did not seam a slight difference between sensors..

 

@jtec

Thought never entered my mind, I appreciate the effort you are providing in assisting me. Unfortunately I am traveling out again this Sunday but at least I know the Transmission Over Temp. is not the actual issue makes me feel better at least. My daughter knows to report anything as far as driveability goes and can use her hand held scanner to pull some codes (limited by the scanner) I purchased an actual higher end scanner several years ago that can pull most if not all the codes as far as Transmission, TPMS etc. I may hand it to her to figure out LOL


Mark

 

Sooo did you ever figure it out? I am having the same issue with my 2006 Overland 5.7L hemi

 

@marka2k Did you ever find the problem? I am having the same issue with my 2006 Jeep Overland 5.7L hemi I have the same codes!

 

Just do the transectomy and be done with it