TWP5253
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- Thread starter
- #1
Although my Jeep is the Diesel, this information might carry over for any Jeep owner experiencing multiple CEL or random lights on the dash! I think Jeep has done a terrible job with their charging system, probably trying to get best fuel mileage.
After owning it 6 months my JLUR was starting to light up my CEL on a regular basis (1 per week avg) Initially I just ignored the codes and was thankful that I had a Tazer Mini installed from almost the very beginning of ownership. The codes came up in what can only be described as random with no real pattern. I always noticed the voltage while driving would vary greatly from 12.2 to 14.5. At about 1 year and 12,000 miles I was now seeing the dreaded Throttle Control and Stability Codes and I suffered a Derate while heading out on a 92 day trip....
Soon thereafter and now about one year old, I swapped out both batteries with an Optima H7 Yellow Top and an O'Reilly Platinum AGM. That got me two weeks of no codes but they came back. I then decided to purchase a Antigravity YTX12-24 Lithium Battery and I ran a separate set of wires to it for charging and to monitor the voltage. This gave me the ability to see if the voltage from the small YTX12-24 battery was different than the large one. During storage I keep a Li charger(Ctek) on the small battery and AGM charger(Optimate) on the larger Yellow top battery.
I don't use my Jeep that often because it is for wheeling when out in my RV. The Li battery is/was just a test to see if it made any difference. It did not really make much difference so don't bother spending $400 on it
. When out on trips and jeeping during the day it would go back to throwing random codes.
I think then I finally had a breakthrough! I had arrived at my Blythe home and before pulling into the garage the low oil pressure light came on. After 4 hours on the freeway the oil was at 215 degrees but I checked and it was full. I did note that when it threw that tantrum, the voltage was at 12.2- 12.3. It dawned on me that I had never thrown any code or light when the voltage was higher. I rarely drive at night but I have never thrown a code with the lights on. I think I know why! When I turn my headlights on the Jeep runs a very consistent 12.9. Since always running my headlights, I have now gone over one month without any codes!
Another observation....This motor does not actually have an oil pressure sensor! How do I know this you ask. I swapped in a new Mopar Filter and I had the oil pressure visible on the dash when I started the motor. The oil filter, being empty allowed the cam and lifters to make lots of noise on startup and yet the oil gauge IMMEDIATELY went to 70PSI. That is not possible if its actually reading the actual oil pressure which took 3-4 seconds to build after it filled the empty filter with oil! The computer is simply guessing and when you have a low voltage situation, the computer does all sorts of crazy stuff.
After owning it 6 months my JLUR was starting to light up my CEL on a regular basis (1 per week avg) Initially I just ignored the codes and was thankful that I had a Tazer Mini installed from almost the very beginning of ownership. The codes came up in what can only be described as random with no real pattern. I always noticed the voltage while driving would vary greatly from 12.2 to 14.5. At about 1 year and 12,000 miles I was now seeing the dreaded Throttle Control and Stability Codes and I suffered a Derate while heading out on a 92 day trip....
Soon thereafter and now about one year old, I swapped out both batteries with an Optima H7 Yellow Top and an O'Reilly Platinum AGM. That got me two weeks of no codes but they came back. I then decided to purchase a Antigravity YTX12-24 Lithium Battery and I ran a separate set of wires to it for charging and to monitor the voltage. This gave me the ability to see if the voltage from the small YTX12-24 battery was different than the large one. During storage I keep a Li charger(Ctek) on the small battery and AGM charger(Optimate) on the larger Yellow top battery.
I don't use my Jeep that often because it is for wheeling when out in my RV. The Li battery is/was just a test to see if it made any difference. It did not really make much difference so don't bother spending $400 on it
. When out on trips and jeeping during the day it would go back to throwing random codes. I think then I finally had a breakthrough! I had arrived at my Blythe home and before pulling into the garage the low oil pressure light came on. After 4 hours on the freeway the oil was at 215 degrees but I checked and it was full. I did note that when it threw that tantrum, the voltage was at 12.2- 12.3. It dawned on me that I had never thrown any code or light when the voltage was higher. I rarely drive at night but I have never thrown a code with the lights on. I think I know why! When I turn my headlights on the Jeep runs a very consistent 12.9. Since always running my headlights, I have now gone over one month without any codes!
Another observation....This motor does not actually have an oil pressure sensor! How do I know this you ask. I swapped in a new Mopar Filter and I had the oil pressure visible on the dash when I started the motor. The oil filter, being empty allowed the cam and lifters to make lots of noise on startup and yet the oil gauge IMMEDIATELY went to 70PSI. That is not possible if its actually reading the actual oil pressure which took 3-4 seconds to build after it filled the empty filter with oil! The computer is simply guessing and when you have a low voltage situation, the computer does all sorts of crazy stuff.
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