P00AF - The Journey

[DC3]

I have been dealing with the P00AF and limp mode for some time and have been self-diagnosing the issue. The error code only occurs when towing under sustained boost conditions (uphill or passing). It seems I never have the presence of mind to bring my Mopar WiTech 2.0 dongle with me on these trips, why I don't leave it in the Jeep is beyond me. I will put it in there today.

Background: 2021 Gladiator EcoDiesel with ~30k miles. I've had the errors for about ~15k miles. The errors occur more frequently at ambient higher temps (+85F).

• I've removed the hood insulation, engine cover, engine insulation, and rubber seals; I have the Mojave hood with the vent open and the '24 grill.
• I have the insane diesel bypass filter but no supplemental cooler yet.

I haven't finished logging through the ECM, but I set up a few wireless grill probes this past week when ambient temps were 70F - 95F. I placed one probe on the turbo actuator and another under the hood. I found the engine bay temps hovering about 20F—25F above ambient while on the highway and 30 - 50F above ambient while driving around town ~35mph. The turbo actuator is about 50 - 75F above engine bay temps. I found no direct correlation of limp mode to the actuator temperature, oil temp, or engine bay temp. Of course, limp mode happens at higher temperatures, but there are no perceivable trends in those measurements. I also measured the temperature of the compressor housing without a clear trend of temp to limp mode activity.

Because I was using a grill probe, I did not log temperatures or measure the turbine housing (the probe only went to 480F).

I have an appointment with the dealer next week to check out the issue for the second time. I suspect they'll replace the turbo, which seems to have fixed the problem for some people. I also ordered the Insane Diesel oil cooler.

I am not interested in deleting the Jeep. I have been there and done that on several diesels, and I am trying to remain compliant with this one.

Also, I added a 480CFM fan above the actuator/compressor housing and found no positive impact except for heat-soaked situations after the truck sat idle for an extended time.

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[suroot]

Watching as I have had this problem for the last 13k miles with 4 trips to the dealer. The dealer clears the codes and sends me on my way..

 

[DylanM]

Per the manual troubleshooting procedures for a P00AF-00 code, possible causes include physical obstruction/binding of the turbo actuator linkage, an open or high resistance in the actuator power supply or ground wiring circuits, or a faulty turbo actuator.

I'd check the actuator linkage for any conditions that may cause it to bind (corrosion, dirt, oil/grease buildup, etc), disconnect the actuator wire connector to clean and inspect the terminals for any issues, and see if there are any areas where the wire harness is sitting too close to a high heat source or possibly chafing on something.

 

[suroot]

Per the manual troubleshooting procedures for a P00AF-00 code, possible causes include physical obstruction/binding of the turbo actuator linkage, an open or high resistance in the actuator power supply or ground wiring circuits, or a faulty turbo actuator.

I'd check the actuator linkage for any conditions that may cause it to bind (corrosion, dirt, oil/grease buildup, etc), disconnect the actuator wire connector to clean and inspect the terminals for any issues, and see if there are any areas where the wire harness is sitting too close to a high heat source or possibly chafing on something.

Here is what the dealership performed 4 times already. I also verified the findings.

 

[DylanM]

@suroot
Food for thought, electrical resistance increases with temperature and typically things aren't up at temps normally seen while driving when the tech is testing the circuits. The same applies for the actuator itself. In either case it's not unusual to find everything within normal specs with an intermittent condition where the fault isn't kicking back out right after clearing, hence why I'd suggest to look for potential heat source or rubbing issues that can induce a problem in normal operation.

 

[suroot]

@suroot
Food for thought, electrical resistance increases with temperature and typically things aren't up at temps normally seen while driving when the tech is testing the circuits. The same applies for the actuator itself. In either case it's not unusual to find everything within normal specs with an intermittent condition where the fault isn't kicking back out right after clearing, hence why I'd suggest to look for potential heat source or rubbing issues that can induce a problem in normal operation.

Agree, I have protected all the known areas where heat and rubbing occur. Not to say I did not miss something which is very possible. One item of interest. This only happens after the engine has been off for more than 2 weeks without fail.

 

[DylanM]

@suroot
In your case of the problem only occurring after sitting unused for two weeks, I'd look into battery or charging system issues. Modern vehicles can exhibit a wide range of very strange and seemingly unrelated faults when supply voltage isn't up to snuff.

 

[suroot]

@suroot
In your case of the problem only occurring after sitting unused for two weeks, I'd look into battery or charging system issues. Modern vehicles can exhibit a wide range of very strange and seemingly unrelated faults when supply voltage isn't up to snuff.

Battery(s) check out OK and connected to a tender every time I park it.

 

[my dog Trigger]

I have the same problem they replaced turbo did not fix, they damaged wire to trans had to fix that later they replaced the plug and wiring nothing they called jeep still have not fixed it. Going to a different dealer on Monday see what they come up with usually goes into limp mode once but this last time it did it twice 5 miles apart so now it’s worse so has any one else had this problem and fixed it?

 

[my dog Trigger]

Ps I don’t tow it did it one time getting on the freeway

 

[djdannis]

I have the same problem they replaced turbo did not fix, they damaged wire to trans had to fix that later they replaced the plug and wiring nothing they called jeep still have not fixed it. Going to a different dealer on Monday see what they come up with usually goes into limp mode once but this last time it did it twice 5 miles apart so now it’s worse so has any one else had this problem and fixed it?

Good to know the turbo replacement did not resolve. Did you test right after replacement? I read somewhere that the VGT vanes in the turbo get caked up in soot if the engine isn’t ran hard and this is the cause of the malfunction. However if a replacement turbo didn’t resolve as long as it was tested for the condition shortly after replacement then that would debunk that theory. I too am having this same issue when pulling grades in Colorado on vacation, but usually don’t see this living in Iowa. I’ve also read turbo EGTs get too high causing the issue as well. Curious to learn more about what is really going on?

 

[my dog Trigger]

Good to know the turbo replacement did not resolve. Did you test right after replacement? I read somewhere that the VGT vanes in the turbo get caked up in soot if the engine isn’t ran hard and this is the cause of the malfunction. However if a replacement turbo didn’t resolve as long as it was tested for the condition shortly after replacement then that would debunk that theory. I too am having this same issue when pulling grades in Colorado on vacation, but usually don’t see this living in Iowa. I’ve also read turbo EGTs get too high causing the issue as well. Curious to learn more about what is really going on?

My dealer can’t figure it out many hours replace parts still does it and yes right after turbo replaced it happened

 

[my dog Trigger]

Per the manual troubleshooting procedures for a P00AF-00 code, possible causes include physical obstruction/binding of the turbo actuator linkage, an open or high resistance in the actuator power supply or ground wiring circuits, or a faulty turbo actuator.

I'd check the actuator linkage for any conditions that may cause it to bind (corrosion, dirt, oil/grease buildup, etc), disconnect the actuator wire connector to clean and inspect the terminals for any issues, and see if there are any areas where the wire harness is sitting too close to a high heat source or possibly chafing on something.

Turbo replaced conector and wiring replaced still happens I do not tow

 

[my dog Trigger]

Hello everyone went to new dealer you won’t believe what there saying suppose to get it back tomorrow will let you know the outcome

 

[djdannis]

Hello everyone went to new dealer you won’t believe what there saying suppose to get it back tomorrow will let you know the outcome

Appreciate the updates!

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