Update 10.27.25 - This has been solved
Solution: Both brake pressure sensors were dead. How they went at the same time, I have no idea but I just decided to bite the bullet and do them both. Turns out they were both dead, and as soon as I replaced them, the data all came back, and the code / lights were gone! Go figure that this 5E26 code is the source of so much frustration with our cars pointing to the Yaw sensor, ABS module, etc. Sometimes it can just be the break pressure sensors. And on that note: There was NO code for either brake pressure sensor, just this 5E26 code.
The sensors in there were the URO tuning OE replacement sensors which I had replaced 1 of 5 years ago, and the other one I have no idea how long it was in there for as it was done under a previous owner. Given the fact that I didn't know if this would solve it or not I opted for the URO sensors and honestly wish I did the OEM ones at this point but oh well.
No more yellow DSC and BRAKE light!!! Woohoo!!
Hey guys,
So I've been chasing a 5E26 Code which has been on/off since 2019 and now its come up constant in the past 6 months, and I cannot figure out what the actual culprit is.
Summary -
- Since 2019 my DSC and BRAKE light would come on in yellow during the winter time. Once it was summer it would go away.
- In 2019 I had my brake pressure sensor 1 replaced but I believe this was from a specific code and not this 5E26 code
- In the last year I noticed it coming on more and more often, always with a 5E26 code
- Since the last 6 months both lights are now constantly on.
Electrical work done -
- Alternator - Replaced March 2020 (Bosch reman.)
- Battery - Replaced July 2024
Codes/Symptoms -
- Current constant code - 5E26 - Control Unit, voltage supply, sensors
- In Sept 2024 I had this code, cleared it and never came back - 5E43 Steering-angle sensor, internal
- This past week I had this code but I believe this is because I pulled the battery when I went on vacation for 2 weeks - 5DF4 System voltage < 9 volts
- Yellow DSC and BRAKE light on dash
- DSC doesn't work, but ABS does work
Attempts to solve this based on research / input from friends with our cars -
- Yaw Sensor replacement - tried a junk yard unit, didn't solve it
- ABS module repair - pulled and had some suspicious connectors resoldered, didn't solve it (granted this was at a electronics shop and not at a automotive place)
Diagnosis (see photos below) -
- A friend who knows our cars really well said to check the data going to the brake pressure sensors, and to see what they read
- With a scan tool I was able to check my car in comparison to a friend's M3
- Both of my brake sensors are not showing any data in comparison to his
Questions -
- Based on the above, I think it could be a ground issue or a broken wire some where, would you agree?
- Is this enough to say that both brake pressure sensors have died and replacing them will solve this?
My friend's M3 - Working sensors -
My car - dead sensors it seems
Thank you in advance for the help!!!!
Solution: Both brake pressure sensors were dead. How they went at the same time, I have no idea but I just decided to bite the bullet and do them both. Turns out they were both dead, and as soon as I replaced them, the data all came back, and the code / lights were gone! Go figure that this 5E26 code is the source of so much frustration with our cars pointing to the Yaw sensor, ABS module, etc. Sometimes it can just be the break pressure sensors. And on that note: There was NO code for either brake pressure sensor, just this 5E26 code.
The sensors in there were the URO tuning OE replacement sensors which I had replaced 1 of 5 years ago, and the other one I have no idea how long it was in there for as it was done under a previous owner. Given the fact that I didn't know if this would solve it or not I opted for the URO sensors and honestly wish I did the OEM ones at this point but oh well.
No more yellow DSC and BRAKE light!!! Woohoo!!
Hey guys,
So I've been chasing a 5E26 Code which has been on/off since 2019 and now its come up constant in the past 6 months, and I cannot figure out what the actual culprit is.
Summary -
- Since 2019 my DSC and BRAKE light would come on in yellow during the winter time. Once it was summer it would go away.
- In 2019 I had my brake pressure sensor 1 replaced but I believe this was from a specific code and not this 5E26 code
- In the last year I noticed it coming on more and more often, always with a 5E26 code
- Since the last 6 months both lights are now constantly on.
Electrical work done -
- Alternator - Replaced March 2020 (Bosch reman.)
- Battery - Replaced July 2024
Codes/Symptoms -
- Current constant code - 5E26 - Control Unit, voltage supply, sensors
- In Sept 2024 I had this code, cleared it and never came back - 5E43 Steering-angle sensor, internal
- This past week I had this code but I believe this is because I pulled the battery when I went on vacation for 2 weeks - 5DF4 System voltage < 9 volts
- Yellow DSC and BRAKE light on dash
- DSC doesn't work, but ABS does work
Attempts to solve this based on research / input from friends with our cars -
- Yaw Sensor replacement - tried a junk yard unit, didn't solve it
- ABS module repair - pulled and had some suspicious connectors resoldered, didn't solve it (granted this was at a electronics shop and not at a automotive place)
Diagnosis (see photos below) -
- A friend who knows our cars really well said to check the data going to the brake pressure sensors, and to see what they read
- With a scan tool I was able to check my car in comparison to a friend's M3
- Both of my brake sensors are not showing any data in comparison to his
Questions -
- Based on the above, I think it could be a ground issue or a broken wire some where, would you agree?
- Is this enough to say that both brake pressure sensors have died and replacing them will solve this?
My friend's M3 - Working sensors -
My car - dead sensors it seems
Thank you in advance for the help!!!!
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