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Persistent c1028 code

  • Lambert
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03 Mar 2026 20:01 #263926 by Lambert
Whatcha. Bellerophon my 2024 van is giving me a persistent c1028 code which is brake pressure sensor in the abs esp unit. Symptoms being no hill hold, and prolonged pressure on the pedal say in traffic at a down hill junction results in much beeping and service esp system on an orange dash. Before I ring the dealer for a warranty is there anything simple to check like a connector or something to jiggle or undo and redo? Nothing has obviously exploded under the bonnet on a cursory exam and it has a firm pedal.

Thanks in advance 

Temeraire (2018 quasar grey automatic)
Pavement princess or back road menace?
Bellerophon (2024 grello van daily)
ADORJ Attention Deficit Ooooh Race Jimny!

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04 Mar 2026 08:23 - 04 Mar 2026 08:28 #263927 by mlines
Replied by mlines on topic Persistent c1028 code
 

The only "easy" check is the last one. The others require a pressure check in the system
C1057 is low voltage detected by the ESP unit, so this is a voltage check on the ESP unit plug. This would be a wiring fault or charging failure

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
Last edit: 04 Mar 2026 08:28 by mlines.
The following user(s) said Thank You: Lambert

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  • Lambert
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04 Mar 2026 09:48 #263928 by Lambert
Replied by Lambert on topic Persistent c1028 code
On szviewer it's giving pressure as 3kpa ish. It's not throwing c1057 that I have seen. Fluid level is perfect and pads appear to be in full contact it's certainly not braking erratically. I'm going to see where I can get with the local dealer later once I've done my big days jobs. Oh rapture, oh joy!

Temeraire (2018 quasar grey automatic)
Pavement princess or back road menace?
Bellerophon (2024 grello van daily)
ADORJ Attention Deficit Ooooh Race Jimny!

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  • Lambert
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04 Mar 2026 10:26 #263929 by Lambert
Replied by Lambert on topic Persistent c1028 code
Curioser and Curioser. It's now decided to give me c1065 brake light relay circuit. This was fired crawling down hill off road and asking for hill decent control. It's worth mentioning that this one was with a different trailer plugged into the electrics than yesterday giving the previous pressure switch code. It's making me wonder if it's related to the trailer harness in the car though it has been fine since installation last year?

Temeraire (2018 quasar grey automatic)
Pavement princess or back road menace?
Bellerophon (2024 grello van daily)
ADORJ Attention Deficit Ooooh Race Jimny!

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