"Service DEF System" P206D Code - Reductant Quality Sensor Circuit High Voltage

[DGT]

OP Update:

The wire harness replacement did not fix the P206D code. It threw this code again within two days of picking it up from the dealer on March 13. With a Moab trip coming up, I didn't return it to the dealer until after the trip.

While in Moab, many additional codes started popping up in addition to the original P206D. The jeep operated fine with the exception of my right front ABS acting up dragging this brake only, to the point that the rotor was 1300 degrees F while offroading at times. On-road, this ABS problem, similar to the P206D did not occur.

Dropped off at dealer on 4/10, and will pickup 4/24. The dealer replaced the PCM, and said they were able to reproduce the problems for the first time, with the Jeep on a lift and wiggling wiring under the jeep around (simulating offroad use). This time, they feel confident that the PCM has been the problem all along.

Only time will tell.

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[flick2614]

Interesting. PCM going haywire really is the only logical explanation after all that troubleshooting.

 

[BDinTX]

@DGT any issues since PCM replacement?

 

[DGT]

@DGT any issues since PCM replacement?

No issues since the PCM replacement!! Fingers crossed!

 

[DGT]

Update from the OP just in case anyone else is searching the P206D code.

The P206D "See Dealer, Service DEF" message has come back on several times over the past couple of months. Always when off-roading. The repairs Jeep attempted, as noted above, after weeks and several dealer visits, did not fix the problem.

The only difference now is that the engine light and code disappear after several restarts once back on the pavement, and there is no trace that it ever appeared i.e. does not leave a "permanent" code as it used to do.

So, I still need a 'fix' for the problem, but it doesn't seem to be a permanent error requiring a dealer to clear the "permanent" code.

 

[DylanM]

Update from the OP just in case anyone else is searching the P206D code.

The P206D "See Dealer, Service DEF" message has come back on several times over the past couple of months. Always when off-roading. The repairs Jeep attempted, as noted above, after weeks and several dealer visits, did not fix the problem.

The only difference now is that the engine light and code disappear after several restarts once back on the pavement, and there is no trace that it ever appeared i.e. does not leave a "permanent" code as it used to do.

So, I still need a 'fix' for the problem, but it doesn't seem to be a permanent error requiring a dealer to clear the "permanent" code.

Sounds to me like the cause of your code is aeration of your DEF when you're bouncing around offroad.

 

[DGT]

Sounds to me like the cause of your code is aeration of your DEF when you're bouncing around offroad.

DylanM, That's a great find - where did you find this information? And thank you!

The DEF aeration could be the culprit, or the rapid altitude change. The error has not occurred for me without both of those items happening.

With the Error now clearing itself (as opposed to it previously being a "permanent error"), the error message should be changed from "Service DEF, See Dealer" to something less onerous.

I also find it strange that, to the best of my knowledge, nobody else has ever had this code appear but me. I would have thought other eco diesels would have had this problem when off-roading.

 

[DylanM]

@DGT
Found it in the service manual, available over in the Gladiator forum here: https://www.jeepgladiatorforum.com/...-service-and-repair-manual-free-online.78333/

A P206D fault has popped up a couple times over on the JT side, with at least one of those similarly only occurring when driving offroad.

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