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  Topic Review (Newest First)
01-31-2020 07:15 AM
Th0r Have you checked the ECM plugs/terminals?

I fought the red lightning bolt for a while. Along with other odd codes including my coolant temp. They weren't related to so I checked grounds, my battery, and pulled and inspected my ECM connections. I found out I had fluid in one of the plugs for the ECM. Dried it out, cleaned the connections and was good for a week before it came back. Popped the plug and, sure enough, fresh fluid. Tasted like coolant. Pulled up the schematics too see what all fed to that plug. Along with the coolant temp sensor on that branch, there was also the throttle control system, and the TCS terminals that were corroded and also where the coolant first pooled causing the "red bolt in brackets" light.

Turned out my coolant temp sensor had a plastic body can cracked. Coolant was forced into the sensor and wicked it's way through my wiring harness all the way to the ECM. Coolant pooled and corroded the connections in one of the 4 plugs (I think it was the orange one). I replaced the coolant sensor, cleaned the ECM, and had no issues since. I checked the ECM plug a week later and had only a small amount of coolant that finished wicking it's way there. Cleaned that up and it was still dry two weeks later.
01-30-2020 08:33 AM
enkioferidu
Quote:
Originally Posted by gspfunk View Post
Correct, however a failing battery wreaks havoc with the electronics in these and has been known to light the dash up like a Christmas tree. Sometimes unrelated to whatís actually happening.
OkI will have it tested ASAP.
01-29-2020 11:04 AM
gspfunk
Quote:
Originally Posted by caulk04 View Post
The red lightning bolt framed in brackets refers to throttle control system.
Correct, however a failing battery wreaks havoc with the electronics in these and has been known to light the dash up like a Christmas tree. Sometimes unrelated to whatís actually happening.
01-29-2020 10:04 AM
enkioferidu
Quote:
Originally Posted by jtec View Post
interesting - I suspected lighting, audio, a possible body damage issue and some type of prom, programmer, or something plugged into DLC.

The P0607 is most concerning. When you clear codes - will they all erase?

As mentioned charging system would be a place to start.. to easy a test inspection to ignore.
They do clear without issue. I noticed after I bought my WK that one of the clips that hold 1 of the 3 connections to my computer will not snap in place. It stays put but I have noticed on occasion I can push it in a little further. I wonder if this could be causing the p0607 dtc? I can get a picture later to show you what I mean. It'd be great if there was a fix tho that as well.
01-29-2020 09:41 AM
jtec interesting - I suspected lighting, audio, a possible body damage issue and some type of prom, programmer, or something plugged into DLC.

The P0607 is most concerning. When you clear codes - will they all erase?

As mentioned charging system would be a place to start.. to easy a test inspection to ignore.
01-29-2020 09:03 AM
enkioferidu Forgot to mention the only aftermarket thing so far is larger tires. Nothing else atm.
01-29-2020 09:02 AM
enkioferidu Thanks for the heads up guys. Just an update. Yesterday it sat all day while I was at work and when I started it up... No red lightning bolt and my temp gauge worked. This morning however same deal no temp gauge and red lightning bolt. Ordered a new thermostat. As for the battery being bad... Maybe it's less than a year old that being said I'll have it checked soon.
01-29-2020 04:11 AM
caulk04
Quote:
Originally Posted by gspfunk View Post
More often than not, the red lightning bolt is due to a battery thatís on its way out. It will cause all kinds of codes and throw you off the scent. Have it tested with a battery tester to see if thatís your culprit.
The red lightning bolt framed in brackets refers to throttle control system.
01-28-2020 09:13 PM
gspfunk More often than not, the red lightning bolt is due to a battery thatís on its way out. It will cause all kinds of codes and throw you off the scent. Have it tested with a battery tester to see if thatís your culprit.
01-28-2020 08:52 PM
nvrdone if it takes along time to warm up and never reaches correct operating temp, im thinking it may have a t'stat stuck in the open position. I had a similar problem with my 5.7 and after replacing 3 aftermarket t'stats, still had the problem. replaced it with a dealer part with the little tab pointed to the top. no more problems. might be worth a try.
01-28-2020 05:11 PM
jtec P0607-ECU Internal Performance
U1402-Implausible Engine Temperature Signal Received
P2181-Cooling System Performance

thats enough to have me ask - jeep is STOCK no aftermarket BS - just like is was made?

Anyway there are your cooling codes.
01-28-2020 02:54 PM
enkioferidu Here are the rest of the codes I am getting.
01-28-2020 02:47 PM
enkioferidu So as of yesterday I have been getting the red lightning bolt. This lead to the engine half cranking and stalling out. Randomly went out and started it again and it started right up.

This morning I went outside to start it to warm it up (19f in my neighborhood this morning) and it started right up. No lights or anything on. I went to hop in to drive to work and the check engine light was solid as well as the red lightning bolt. I drove it with no problems other than the lights. I did notice my temp gauge was stuck on cold and it took forever for my heat to get warm... Even after 10-15 minutes of letting it run before we got in it. I do have some codes, but nothing I've seen that has to do with temp or thermostat.

It never went to limp mode and as long as it starts it stays running just fine. I've looked at random sources and they all vary. Thought I'd ask the experts.

2007 Grand Cherokee Laredo 3.7l

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