U0403 transfer box error code

[lohr500]

Engine warning light came on today as I shifted from high to low box. OBD diagnostic tool threw up a U0403 error code. The diff locks wouldn't engage either, but the centre dash display was showing transfer box in 4 low. An internet search on the code brings up "Invalid data received – transfer box control module" I cycled the ignition a couple of times and the engine light went off.
Has anyone else seen this code? I did a forum search and drew a blank. Hoping it's a one off glitch and not a sign of a recurring problem.
With the ongoing issue I have with the front parking sensors and the stop/start system, I am beginning to lose faith in the vehicle.

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[JeepCares]

Engine warning light came on today as I shifted from high to low box. OBD diagnostic tool threw up a U0403 error code. The diff locks wouldn't engage either, but the centre dash display was showing transfer box in 4 low. An internet search on the code brings up "Invalid data received – transfer box control module" I cycled the ignition a couple of times and the engine light went off.
Has anyone else seen this code? I did a forum search and drew a blank. Hoping it's a one off glitch and not a sign of a recurring problem.
With the ongoing issue I have with the front parking sensors and the stop/start system, I am beginning to lose faith in the vehicle.

Hi lohr500,
Please let us know via private message if this continues to happen as we would like to have this documented looked into further with the help of your dealership.
Lydia
Jeep Social Care Specialist

 

[Arterius2]

Hi lohr500,
Please let us know via private message if this continues to happen as we would like to have this documented looked into further with the help of your dealership.
Lydia
Jeep Social Care Specialist

There is Jeep Care in the UK?

 

[lohr500]

@Arterius2 : I don't think so.

@JeepCares : I am in UK, do you still want me to PM you if the problem continues? My understanding is that JeepCares doesn't cover UK market.

 

[W1ck3d]

Whats wrong with the start stop and the parking sensors?

 

[W1ck3d]

Your problems all seem related.... I would check the g916 ground... It maybe loose or twisted or something.... The only similarity the park assist and transfercase have in common this that ground... Do you have a 4door?

 

[lohr500]

It's a 4 door 2.2 diesel, UK spec. Rubicon.

The rear park assists work perfectly but fronts haven't worked since I collected the 4 month old vehicle from the Jeep dealer around 4 months ago. The front PA volume settings are present in the settings menu, but the system isn't working, with no image on the centre dash display.
When Reverse is selected and the parking sensor ICON appears in the centre display, the image also shows grey sectors at the front of the vehicle, but the fronts won't sound if you block a sensor, nor do any of the front grey sectors turn yellow.
When in Drive, at slow speed, or when manoeuvring between R & D, the parking icon doesn't appear and no warning sounds are made when in very close proximity to sold objects.

The Stop/Start was working but then stopped. When manually switched off using button on dash, the button lights up but the warning message no longer appears in centre display. Initially I thought it may be due to a low AUX battery voltage, so I charged both batteries separately. It made no difference.

The dealer got front parking assist working briefly during a 1 day visit to the workshop last week, but it had failed again by time I picked the vehicle up. They suspected that water had got into the front loom when they washed it.

The Stop/Start had them beat, despite them swapping modules off a donor vehicle.

It is now booked in for a whole week in July so FCA can get involved with diagnostics.

@W1ck3d, I'm not sure if it is the G916 ground because if I look at the wiring diagram I think that ground provides the ground for the main park assist module. The individual front and rear sensor grounds all run back to the main control module. As the rears are working perfectly, would that not suggest that the module is grounded OK to g916?

I had the rear trim out of the vehicle to run the trailer harness wiring so I checked the actual park assist control module outputs (module mounted on rear quarter panel behind trim) using the wiring diagram on the forum pages. There was no +12v feed to the sensors on the pin for the front harness (pin 1 on the module). The 12v sensor feed pin on the rear harness (pin 4) was ignition live all the time, so I suspected a faulty control module or software config issue. I was going to investigate further and then decided after spending $50k on a vehicle, Jeep should sort it out themselves!!!

So I'm going to let them figure it out when they have it for the week.

At least they did the RHD safety critical steering recall (V26) whilst they had it for the day to try and get the park assist and stop/start working

 

[W1ck3d]

Hmmm may be right... I was just looking what links your fault code to the other issues.... Its also odd your front bumper isnt throwing codes for the park assist not functioning.... Silly question, but did you check the settings in the radio/cluster to make sure it didn't get disabled somehow?

 

[W1ck3d]

I wonder is a terminal was pulled out of a connector somewhere due to not being enough slack in the harnesses, or possibly in the bcm might be a wire pulled out.... Id have to see it to diagnose and check voltages and things... I was just trying to toss ideas around off the top of my head... There has been issues with the sensors wires getting pinched in the bumper by a bolt... The only way to check would to be check for voltage at the bumper connector... If everything is there, might just be a bad sensor in the bumper

 

[lohr500]

Hi W1ck3d, not a silly question. I have checked the settings in the radio cluster several times just to be sure it wasn't user error!!
The settings are there for the front sensors and I have tried selecting different volume levels and sadly it makes no difference.

There is no 12v feed coming out of the main park control module to the front sensors. (they are all fed by a single 12v feed from the PCM and wired in parallel at the bumper end). So my money is on either a faulty PCM module, or a software/config issue. Or perhaps as you suggest a damaged wire in the loom and the PCM is smart enough to shut down the 12v feed to the front on detecting a fault. But the dealership said there were no stored fault codes relating to the parking system There is only one canbus pair of wires to the module, so front and rear sensor control must be through the same canbus wiring.

Hopefully they will get to the bottom of it when they have it for a week. I am especially keen for them to sort out the front sensors as I plan to replace the stock EU spec front bumper with something more appropriate. The stock bumper looks ugly and sticks out too far. But I don't want to mess with the bumper until the sensors are working, otherwise the dealership may say that the warranty is invalid because I swapped bumpers.

 

[W1ck3d]

What about a 5v feed? If i remember correctly the bus is linked into all of that... The bus runs at 5v... So you would get voltages like 2.4 and 2.6 type stuff.... I haven't messed with the pts system in awhile... Il look it up a bit later.... Its odd you has park assist problems followed by transfer case faults so i was trying to see what links them... Are the transfer case faults gone.? Can you switch into 4wd with no issues? Maybe im over thinking it and its 2 problems and not one.... Whatever the case maybe can you keep me updated on what happens? Im super curious!

 

[W1ck3d]

And i agree... The export bumpers are hideous... And weve been building nothing but exports lately haha im getting sick of looking at them.... Only plus is that you get more room for your butt when you sit on them

 

[lohr500]

Despite several shifts between high and low box over past few days,I haven't been able to repeat the error code, so hopefully a one off. And the rear sensors continue to work OK.
I'll report back as things develop. Booked into dealer for w/c 6th July.

Agree, the bumper does make a good seat, but that's all it is useful for

 

[W1ck3d]

I forgot they have that stupid sliding lock connector too... Those are stupid and a pain... I always see them not seated properly or pins get bent in the connection

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