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  Topic Review (Newest First)
01-22-2020 09:02 PM
ColdCase Documentation is inconsistent so can’t guaranty it, but most WK2s don’t monitor the spare. There is some mention that the base system monitors the donut spare in some, but dunno.
01-22-2020 01:02 PM
tom19511 Does the spare have a sensor in it?
01-22-2020 11:54 AM
GPSBob Interesting. Sorry I missed that in the earlier post. Amazing that the wheel sensors are so sophisticated. Thanks.
01-22-2020 09:53 AM
ColdCase Post 10 has this explanation:

“ The TPM uses information transmitted from each of the wheel sensors as well as the difference in the strength of the signal received to determine the location of each of the sensors. Its the so called WAL protocol.

The information transmitted are samples from a dual-axis accelerometer in the sensor, which determines the right/left position of the tire monitor in response to a forward acceleration. The front/rear position of the transmitting tire monitor is detected by the signal strength of the transmission.

This is why the sensors are actually more complex than the receiver, and why the cheap or aftermarket sensors often don't work correctly.... and interference can affect performance.”

The tire sensor has at least three types of sensors built in, pressure, temperature, acceleration/rotation.

So one failure mode is when the acceleration sensor fails, you get pressure readings but the TPMS doesn’t know where the sensor is locate for sure. It uses the last known location for the ID and sets the fault code. In this case some hand held wheel sensor with show good as they don’t check all the data, just if the tire sensor can transmit and the ID.

To have a better idea, one hooks up a OBD scanner that can read the sensor data stored (not just the ID). May not help, but would eliminated a few possibilities. The OP’s dealer should have done this, dunno. If so, then you are into signal strength, interference, harness damage, or a bad replacement part situation.. or one of those nasty intermittents. But the simple thing first is to reset (disconnect battery, temporarily increase tire pressure to well beyond trigger points)
01-22-2020 08:58 AM
GPSBob How does the system know which wheel each sensor is at?
01-22-2020 08:17 AM
ColdCase The older and base system may have a couple antennas... the OP has a premium system where the antenna is internal to the TPMS module. The base system does not have a TPMS module, the early model's WIN received the info from the sensors.
01-22-2020 07:59 AM
GPSBob I think the system uses multiple antennas to pick up the sensor signals. Could one of those be bad? Seems like maybe if an antenna/connection is bad, the system might receive all of the sensor signals, but would not be able to determine which sensor is at each wheel.
01-21-2020 07:15 PM
islandjeeper2 i will need to give those recommendations a try. i just wish it would tell me which sensor it was because i have gone to the dealer 2 different times and the tech went around to each sensor and got the sensor ID number and updated it to the correct location and still the light would come on later. i was going to try to see if i can us the appcar FCA program to see if i can make any changes.
01-21-2020 06:25 PM
ColdCase You could also try increasing pressure to 40 psi, driving 45 minutes, then reduce the tire pressure to your working pressure.
01-21-2020 06:12 PM
ColdCase My nephew that sometimes does tire work deals with something like this often. He use a programming tool for TPMS and walks around the vehicle, holding it to each sensor, and write down the sensor IDs. (most tire shops in the US do this for free)

Then they use their shop scanner to read the sensor data in the TPMS module and write down the IDs.

If the IDs don't match, they replace the sensor. If everything checks out then they replace the TPMS module. Rare, but you get a bad replacement TPMS module.

Schrader or OEM sensors seem to work well. He now prefers generic sensors with a metal stem that are more resistant to corrosion, but they have the programming tools.

Also, the sensors have a radio transmitter and when batteries get weak, the signal weakens. Sometimes the computer picks it up, sometimes not. When it doesn't pick up a signal, it sets a system fault and status message. These sensor signals can go in and out for some time before completely going dead.
01-21-2020 05:59 PM
ColdCase I would try disconnecting the battery for 5 minutes, let the jeep sit for at least 20 minutes, drive more than 15 mph for 20 minutes and see what happens.

For some reason the module can't determine accurately where the sensors are, so the dash reading may be for a different wheel.

The TPM uses information transmitted from each of the wheel sensors as well as the difference in the strength of the signal received to determine the location of each of the sensors. Its the so called WAL protocol.

The information transmitted are samples from a from a dual-axis accelerometer in the sensor, which determines the right/left position of the tire monitor in response to a forward acceleration. The front/rear position of the transmitting tire monitor is detected by the signal strength of the transmission.

This is why the sensors are actually more complex than the receiver, and why the cheap or aftermarket sensors often don't work correctly.... and interference can affect performance.
01-21-2020 05:08 PM
islandjeeper2 i have changed the tpm module already with a new oem unit and then went to the dealership to get it programmed correctly. i dont really know what else to check other than changing all 4 of the tire sensors which is not going to be cheap.
01-21-2020 04:51 PM
ColdCase I'd suspect a sensor(s) with an acceleration (or rotation) hardware fault, a damaged harness, bad grounds, or interfering accessories. A sensor may not be transmitting all the data, but enough to fool a hand held tester. Most of these kinds of faults are due to interference of some kind, like a noisy alternator or a bad ground sparking.

If these codes are reset and come back then its saying the TPM can't determine the TPM sensor positions. Cause could be non-FCC compliant components, sensor(s), the TPM module, incorrect TPM installation, aftermarket devices installed (I've heard that some USB cables, adapters, and devices can interfere so disconnect them all). Interference may occur if the TPM Module is installed incorrectly or the TPM harness is not fastened properly to the body (affects antenna performance).

A system fault can occur by many scenarios, including the following:

•Signal interference due to electronic devices or driving next to facilities emitting the same Radio Frequencies as the TPM sensors.
•Installing some form of aftermarket window tinting that affects radio wave signals.
•Accumulation of snow or ice around the wheels or wheel housings.
•Using tire chains on the vehicle.
•Using wheels not equipped with TPM sensors.

The premium Tire Pressure Monitoring (TPM) module is located behind the left rear wheel splash shield mounted to weld studs over the fuel inlet pipe bracket. The TPM receives information from each of the sensors in the form of RF signals. The information contained in each of the transmissions provides all the information necessary for the TPM to determine the pressure in each tire as well as the position of the sensor. This auto-locating process only happens in the first 10 minutes of any drive cycle while traveling at speeds above 15mph (24 km/h) (The auto-locating process will start again only if the vehicle has been shut off for approximately 20 minutes or longer). The TPM then transmits the required information directly to the CCN in order to update the lamp, chime and display as required.

C1580-00-LEFT/RIGHT SIDE TIRE PRESSURE SENSOR LOCATION UNDETERMINED

To be set, it must fail multiple vehicle TPM sensor locate processes if localization fails due to Left/Right fail or if the TPM module is new and has never attempted localization.

To further diagnose you need a scan tool that can read TPM sensor data, including pressure sensor hardware fault, temperature sensor hardware fault, acceleration sensor hardware fault.

If the fault is intermittent, replace the TPM module


C151D-00-TIRE PRESSURE SENSOR LOCATION UNDETERMINED

This code should not exist on its own, it is probably set by the fault above.

To be set, it must fail multiple vehicle TPM Sensor locate processes if localization fails due to Left/Right fail or Front/Rear fail or if the TPM Module is new and has never attempted localization. If missing TPM Sensors are present on first drive, C151D will set to show that the TPM Sensor location cannot be determined/guaranteed (cannot revert to last known good locations).
01-21-2020 03:48 PM
islandjeeper2
Quote:
Originally Posted by ColdCase View Post
Does the TIPM lamp flash and go solid?

Are they OEM sensors or aftermarket?

Sensors can go intermittently bad, so they test good most of the time but have a glitch now and then. Folks have reported this kind of thing with aftermarket sensors.

But wee need the codes to be of much help and the data:

•Tire * Pressure Sensor HW Defective
•Tire * Rotation Detection HW Defective
•Tire * Loss of Sensor Signal
•Tire * Missing Sensor ID
•Tire * Duplicate Sensor ID


Are you driving anywhere near radars or radio equipment that could be interfering with the sensor RF signals?
so i just got the codes and they were C151D-00 and C1580-00. im not sure what they mean but im curious to know how to fix them.
01-16-2020 08:41 AM
JeepCares
Quote:
Originally Posted by islandjeeper2 View Post
i have a 2014 wk2 and i have had the service TPMS system on for quite a while now. ive taken it to the dealership and they tested each sensor in the tires and said they were fine and reset the system atleast 3 different times but everytime the light would come back in a day. the dealership then told me it was the tpms module so i got that replaced and reprogrammed at the dealership and i still have the light on saying the same thing. all the sensors are showing the PSI for each tire and fluctuate when adding or taking out air. im stumped and so is the dealership, im wondering if anyone has any suggestions or has encountered this before.
Hello islandjeeper2,
We are certainly sorry to hear about your ongoing concern. To clarify, when was your most recent diagnosis with the dealer? If your most recent appointment was in the last two weeks, or if you’re willing to head back to your dealer again, we would be more than happy to escalate a case on your behalf so that a Case Specialist can work alongside your dealer to find a potential solution. Please let me know how you plan to proceed when you can, hope to hear from you soon.
Laura
JeepCares
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