Help! Engine light, multiple codes

[vicsvx]

I just received these codes after fueling up
C121C-00 Torque Request Signal Denied
U0074-00 DEDICATED POWERTRAIN (D-PT) CAN BUS OFF
C16CF-15
B16D3-15 Throttle Actuator Control Module Processor
U140E-00 Implausible Vehicle Configuration Data Received

I got the codes from tazor and googled them.. The only one I couldn't find solid answer on is C16CF-00

Not sure where to start looking... They all seem related (one is causing a chain reaction)

21 eco with 53k miles
No prior issues however, I was getting "service shifter" notification on and off. Did read about the wiring harness chafing on the exhaust and I tried to move the harness.

Also, I did swap axles recently from a rubicon about 300 miles ago.

TIA

Edit : just got back from autozone to scan codes

P04DA closed loop EGR control at limit - flow too high

P026C Fuel Injection Quantity "A" Lower Than Expected

C121C-00 Torque Request Signal Denied

Now I'm really confused... Tazer points towards ABS and scan tool points to EGR system

C

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[DylanM]

Code: C121C
Definition: Torque Request Signal Denied
Description: Powertrain Control Module (PCM) informed the Anti-lock Brake System (ABS) Module that it will not allow the engine torque reduction requests. Engine is above 360 rpm.

Code: U0074
Definition: DEDICATED POWERTRAIN (D-PT) CAN BUS OFF
Description: Electronic Shift Module (ESM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the Dedicated Powertrain Bus (D-PT/ Eshift) between the ESM and Transmission Control Module (TCM).

There is no such thing as C16CF-15, perhaps you meant B16CF-15.
Code: B16CF-15
Definition: Left DRL Lamp Control - Circuit Short To Battery Or Open
Description: When the Body Control Module (BCM) detects a high condition on the Left DRL Lamp Control circuit for greater than 1.28 seconds.

Code: B16D3-15
Definition: Right DRL Lamp Control - Circuit Short To Battery Or Open
Description: When the Body Control Module (BCM) detects a high condition on the Right DRL Lamp Control circuit for greater than 1.28 seconds.

Code: U140E
Definition: Implausible Vehicle Configuration Data Received
Description: The Body Control Module (BCM) Indicates that hill decent and select speed control are both present on the vehicle, or select speed control is present and ELSD is not present.

Code: P04DA
Definition: CLOSED LOOP EGR CONTROL AT LIMIT - FLOW TOO HIGH
Description: The PCM detects that the deviation between the desired EGR valve position and the actual EGR valve position is more than a calibrated threshold for 2.0 seconds. This is a two Trip Fault.

Code: P026C
Definition: FUEL INJECTION QUANTITY LOWER THAN EXPECTED
Description: The Powertrain Control Module (PCM) uses a Fuel Mass Observer (FMO) Monitor to check the injection correction quantity for exceeding permissible limits and the fuel mass over a period of time. The FMO activation time monitor checks time to enter closed loop air/fuel ratio control diagnosis.

The shifter issue you've been having is associated with your U0074 code. You're going to need to look into the bus wiring between the shifter and PCM/TCM. The star connector near the glove box would be a prime suspect.

For the remainder of the faults I'd start with fully charging the batteries, give the wiring and connections a good once over in the engine bay with special attention paid around the PDC, BCM, and PCM, then clear the codes to see if they come back.

A few threads for you to read:
https://www.jeepgladiatorforum.com/forum/threads/2021-jtwd-ecodiesel-p026c-code.79476/
https://www.jeepgladiatorforum.com/forum/threads/check-engine-light-20k-miles-p026c-code.45746/
https://www.jeepgladiatorforum.com/forum/threads/service-shifter-message.97920/

 

[Zachanadandy]

With that many codes it's either wiring (could be very long and troublesome to find) or battery. Easy button says replace battery and see what happens.

 

[Lost1wing]

C16CF-15

Calibration error.

Corrupted software in accurate date.

Doesn't say what module

DOT obd2 codes

I would bet you have a chafing harness.

 

[vicsvx]

Code: C121C
Definition: Torque Request Signal Denied
Description: Powertrain Control Module (PCM) informed the Anti-lock Brake System (ABS) Module that it will not allow the engine torque reduction requests. Engine is above 360 rpm.

Code: U0074
Definition: DEDICATED POWERTRAIN (D-PT) CAN BUS OFF
Description: Electronic Shift Module (ESM) performs various internal tests to verify proper controller operation. This DTC indicates that there is an issue with the Dedicated Powertrain Bus (D-PT/ Eshift) between the ESM and Transmission Control Module (TCM).

There is no such thing as C16CF-15, perhaps you meant B16CF-15.
Code: B16CF-15
Definition: Left DRL Lamp Control - Circuit Short To Battery Or Open
Description: When the Body Control Module (BCM) detects a high condition on the Left DRL Lamp Control circuit for greater than 1.28 seconds.

Code: B16D3-15
Definition: Right DRL Lamp Control - Circuit Short To Battery Or Open
Description: When the Body Control Module (BCM) detects a high condition on the Right DRL Lamp Control circuit for greater than 1.28 seconds.

Code: U140E
Definition: Implausible Vehicle Configuration Data Received
Description: The Body Control Module (BCM) Indicates that hill decent and select speed control are both present on the vehicle, or select speed control is present and ELSD is not present.

Code: P04DA
Definition: CLOSED LOOP EGR CONTROL AT LIMIT - FLOW TOO HIGH
Description: The PCM detects that the deviation between the desired EGR valve position and the actual EGR valve position is more than a calibrated threshold for 2.0 seconds. This is a two Trip Fault.

Code: P026C
Definition: FUEL INJECTION QUANTITY LOWER THAN EXPECTED
Description: The Powertrain Control Module (PCM) uses a Fuel Mass Observer (FMO) Monitor to check the injection correction quantity for exceeding permissible limits and the fuel mass over a period of time. The FMO activation time monitor checks time to enter closed loop air/fuel ratio control diagnosis.

The shifter issue you've been having is associated with your U0074 code. You're going to need to look into the bus wiring between the shifter and PCM/TCM. The star connector near the glove box would be a prime suspect.

For the remainder of the faults I'd start with fully charging the batteries, give the wiring and connections a good once over in the engine bay with special attention paid around the PDC, BCM, and PCM, then clear the codes to see if they come back.

A few threads for you to read:
https://www.jeepgladiatorforum.com/forum/threads/2021-jtwd-ecodiesel-p026c-code.79476/
https://www.jeepgladiatorforum.com/forum/threads/check-engine-light-20k-miles-p026c-code.45746/
https://www.jeepgladiatorforum.com/forum/threads/service-shifter-message.97920/

Woah thanks for all info! I feel like it's a wiring harness chafing, specifically the shifter wiring harness against the exhaust, I read about it hear and there on both JL and JT forums. I looked at the star connections last night and everyrhing looked ok. But I did notice the batters were charging around 14.2v which is odd. Both batteries were replaced under warranty a few years ago. As for code C16CF-15, that's what tazer threw at me

 

[vicsvx]

With that many codes it's either wiring (could be very long and troublesome to find) or battery. Easy button says replace battery and see what happens.

Yeah, the batteries were charging at 14.2 yesterday, so there's that. But they aren't even that old lol

 

[vicsvx]

C16CF-15

Calibration error.

Corrupted software in accurate date.

Doesn't say what module

DOT obd2 codes

I would bet you have a chafing harness.

My suspicion is the shifter wiring harness found in the thread
https://www.jeepgladiatorforum.com/...steering-and-other-intermittent-faults.46673/

https://www.jlwranglerforums.com/forum/threads/“service-shifter”-wire-harness-issue.68876/

 

[willys 41]

I just had an issue with my tazer.
For many weeks now I was getting a bunch of codes that did not make any scene. All communication codes pointing to the gate way of witch the tazer is the gate way.
I suspected the tazer was the problem because over the 4 years I had the tazer in the jeep I had to do a recover a few times.
I was able to clear the codes using the tazer put the last time the tazer would not clear the codes.
I did a recover and updates put as soon as I plugged the tazer back in the codes would instantly come back.
I cleared the codes using my scanner and drove the jeep 200 miles with out the tazer with no issues.
The tazer is now on its way back to Z Automotive for repair or replacement at a cost of $50 plus shipping.
Helpfully when I get it back there will be no more issues.

 

[vicsvx]

I just had an issue with my tazer.
For many weeks now I was getting a bunch of codes that did not make any scene. All communication codes pointing to the gate way of witch the tazer is the gate way.
I suspected the tazer was the problem because over the 4 years I had the tazer in the jeep I had to do a recover a few times.
I was able to clear the codes using the tazer put the last time the tazer would not clear the codes.
I did a recover and updates put as soon as I plugged the tazer back in the codes would instantly come back.
I cleared the codes using my scanner and drove the jeep 200 miles with out the tazer with no issues.
The tazer is now on its way back to Z Automotive for repair or replacement at a cost of $50 plus shipping.
Helpfully when I get it back there will be no more issues.

Maybe I'll try removing the tazer and see what happens...I didn't think of that.

What really makes me. Scratch my head is the tazer shows 4 or 5 codes but autozone shows 3 but only one code is the same from each C121C-00

 

[Sailorblue]

Batteries....

 

[Tom2020Glad]

I'll jump on the batteries bandwagon as well. Anything wonky with either of them, and error codes and wierd shit abound.

Also, just for giggles, if you have any plugged in constantly (i.e. Tazer as you have mentioned) unplug it all and see if that changes anything. My driver's side window wasn't staying up all the way on my Challenger recently......kept bouncing up and down (the slight gap at the top thing when the door is opened/closed). Turned out that my dual port accessory plugged in under my console lid was weaseling it's way out. Pushed it all the way in and the issue stopped.

These vehicles these days are very touchy electronically.

 

[vicsvx]

Batteries....

As much as I would like to belive the battery thing... My last failing batteries just gave aux switches temporarily unavailable lol

 

[Tom2020Glad]

As much as I would like to belive the battery thing... My last failing batteries just gave aux switches temporarily unavailable lol

Unfortunately, that doesn't mean a thing. A duplicate scenario is unlikely. I wish a code would point directly at the issue as well, but unfortunately it's all tied together spaghetti style.

 

[vicsvx]

Unfortunately, that doesn't mean a thing. A duplicate scenario is unlikely. I wish a code would point directly at the issue as well, but unfortunately it's all tied together spaghetti style.

I checked the main battery just now... Overnight she's holding 12.7v...havrmt got to the aux battery tho. Little more work involved with that one

 

[vicsvx]

Just checked the aux battery, it's at 12.4v...So both batteries are showing good voltage

I disconnect both batteries for awhile while I looked at the shifter wiring harness... Sho nuff, the harness was chafing on the EGR exhaust. I tucked it behind the heat wrapping but will probably take it in...I took a photo of the damage and it looks like it went through some wire.

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