[Bims328i]

Had the left rear TPMS sensor go bad about 4 years ago. Replaced and have not had any issues until now. Getting 604E RDC: RDC System and 6056 RDC: Wheel Electronics, rear left. Same as last time.

Originally it was the rear left which was replaced and have since rotated the tires. The wheel with that new TPMS sensor is now on rear passenger. With it telling me it's the rear left, can the RDC system tell which sensor is which by distance or does it think that wheel sensor is still on the rear drivers side?

It looks like the sensor has been updated as well. The one I purchased 4 years back was black, same actual part number. Shouldn't be any issues I presume.

[Fredo]

Sounds like you have another bad sensor. Check this thread in case you need new ones:

https://f30.bimmerpost.com/forums/sh....php?t=2023970

[gbalthrop]

Originally Posted by Bims328i

Had the left rear TPMS sensor go bad about 4 years ago. Replaced and have not had any issues until now. Getting 604E RDC: RDC System and 6056 RDC: Wheel Electronics, rear left. Same as last time.

Originally it was the rear left which was replaced and have since rotated the tires. The wheel with that new TPMS sensor is now on rear passenger. With it telling me it's the rear left, can the RDC system tell which sensor is which by distance or does it think that wheel sensor is still on the rear drivers side?

It looks like the sensor has been updated as well. The one I purchased 4 years back was black, same actual part number. Shouldn't be any issues I presume.

If this is RDC on 2008 328i:
There is a Transmitter unit in each wheel well (up until 9/2009, 2010 Models). That Transmitter communicates with the Pressure (& Temp) Sensor inside the tire, on Valve Stem. The Fault Code for Left-Rear tire relates to communication between the Transmitter in Left-Rear wheel well & tire Pressure Sensor mounted in that wheel well.

Either INPA or ISTA will show you the Pressure & Temperature signal received by EACH of the four Wheel Well Transmitters. That Live Data also includes a display of remaining battery life (Months) for each Wheel Sensor. That Live Data is BEST way to Diagnose an issue.

If ONE wheel has an issue with signal, rotating tire with other wheel on that side (or spare if used in 5-wheel Rotation Regimen), is best way to see if signal fault is Wheel Sensor, or Transmitter/wiring issue. You can of course use that same "Rotation" method to see if fault follows wheel sensor.

Please let us know what you find, or if any questions. If you need ISTA wiring diagram, please provide Last-7 Characters of VIN.
George

[Efthreeoh]

Remove the fender liner and see if a rodent chewed on the wire harness going to the TPMS receiver. The receiver sits in a cavity in the metal wheel housing at the 12 o'clock position.

[Bims328i]

Thanks homies! Efthreeoh which fender liner is it under, I'll look into it for sure.

gbalthrop That's kind of what I was wondering. Left rear wheel was bent and sensor went shortly after buying the car. Had that replaced a long while ago and now a different wheel is in its spot because of the rotation so I'm not sure if the system knows the wheels have moved or it thinks the wheel is still on rear left.

[Bims328i]

Just to clarify, there is a transmitter in each wheel well too?

[Efthreeoh]

Originally Posted by Bims328i

Thanks homies! Efthreeoh which fender liner is it under, I'll look into it for sure.

gbalthrop That's kind of what I was wondering. Left rear wheel was bent and sensor went shortly after buying the car. Had that replaced a long while ago and now a different wheel is in its spot because of the rotation so I'm not sure if the system knows the wheels have moved or it thinks the wheel is still on rear left.

It's behind the felt-like fender liner.

[Efthreeoh]

Originally Posted by Bims328i

Just to clarify, there is a transmitter in each wheel well too?

Yes.

[Bims328i]

Originally Posted by Efthreeoh

It's behind the felt-like fender liner.

Alright, so one of the two rear liners. Any idea if left or right?

[gbalthrop]

Originally Posted by Bims328i

Just to clarify, there is a transmitter in each wheel well too?

Not sure we're understanding each other. Assuming you have 2008 328i:

1) There is a wired Transmitter in each wheel well, near the tire;
2) There is a battery-operated Pressure sensor, per your photos, mounted inside each tire, on Valve Stem;
3) 6056 Code indicates Left Rear Transmitter is NOT receiving signal from Pressure Sensor in LR tire;
4) If you had INPA or ISTA, you could see Pressure & Temp for each tire as Live Data, with remaining Sensor battery life;
5) Absent that software, simply swap LF & LR wheels. If Sensor in Former LR wheel is bad, you will NOW have 6054
Code, meaning Left Front Transmitter NOW has no signal. Replace Sensor on inside tire swapped to Left Front.

See attached ISTA ScreenPrint for Left Rear Transmitter Location & Wiring Diagram SSP.
George

[Bims328i]

I don't have ither of the programs unfortunately. Would like to have it setup on this extra laptop I have but alas it is so tricky to get the program anymore it seems.

You have clarified my question as there are near wheel transmitters to tell the system the nearest wheel so yes it should be able to tell the different wheel sensor is bad.

I have a Schwaben scanner that is basically reporting the same set of codes as before.

I have already purchased the same sensor replacement along with the 48mm stem which is not included (had this issue last time)

So in the case you replace a sensor in X wheel then do a rotation, the wheels could get mixed up but mainly the car can tell the nearest sensor to wheel well transmitter so it is not confused where each wheel sensor is after rotating them around.

[gbalthrop]

You MAY be making this WAAAY too Hard.
Just swap LF & LR wheels & see if fault changes from 6056 to 6054.

The RDC Tire Pressure Monitor System, prior to 2010 models, doesn't CARE what Pressure Sensor is mounted inside each tire, whether it's ever seen that wheel before, whether it's Stolen, over-inflated, punctured, etc.

The "Transmitter in each wheel well, which is "Hard-wired" to the RDC Module in the trunk, will communicate with WHATEVER Pressure Sensor is in the tire mounted in that wheel-well, IF:
1) The Sensor's battery is functioning;
2) The Sensor is functioning;
3) The Sensor Frequency & signal type is correct for YOUR RDC System.

If you have the correct Replacement Pressure Sensor, it's "Plug & Play". But don't take ANYTHING apart (yet). Just clear codes, swap wheels (LF / RR), & read/report codes. If all Pressure Sensors, except Left Front, are > 4 years old, you MAY have other sensors on Right side whose batteries are depleted. Check back before you buy anything new. There are alternatives: Amazon, ~ $50 for set of 4.
George

[krhodes1]

To echo George, swap wheels around. If the problem follows the wheel, it's the sensor/transmitter, if it doesn't, it's the receiver.

If you get fed up with troubleshooting/spending money on this, it is relatively trivial to code the car to use "FTM" which uses the ABS wheel speed sensors to tell whether a tire is low rather than TPMS with the transmitter sensors in each wheel directly reading the pressure. Did that to my car when a sensor failed, works just fine. FTM was used in most of the rest of the world. TPMS was required by the US Feds for a while, but now they allow either system on cars.

[Efthreeoh]

Originally Posted by Bims328i

Alright, so one of the two rear liners. Any idea if left or right?

Each TPMS-sensor in the wheel is a transmitter and needs a corresponding receiver located in the wheel well. It is a low-power radio system with a near-field antenna. The rear TMPS receivers are at the 12 o'clock position in a pocket stamped into the sheet metal that forms the wheel well of the car body. The front receivers are attached to the fender liners.

Any tire shop will have a device that can check on the health of the wheel transmitters. You can have a tire shop check them.

[Bims328i]

Thanks for the help guys. Turned out to be the wheel sensor. Used Schwaben scanner to reset and it's all good.

To add here is the genuine BMW TPMS that came out. 08' 328i E90 (requires 48/48.5mm stem for new orange sensor)