C0592 code meaning
Brake Booster Motor B Phase U-V-W Current High
What C0592 means
C0592 reports excessive current in the second motor or second winding system, B, of an electric brake booster. No manufacturer publishes it in this sense; the number appears only in GM's keyword list PIP5094 for 2014 and older vehicles, from an earlier numbering. Side B exists in redundant layouts such as the Hyundai Mobis dual-winding booster motor, where two power modules with six MOSFETs each drive one winding and the healthy module takes over the full current command once the other is diagnosed as failed. Overcurrent on such a stage is caught by MOSFET drain-source monitoring and shunt amplifiers, as offered by TI's DRV8343-Q1. GM's side A limits (above 20 A leakage, 38 A offset) show the order of magnitude. Expect assist on side A only or reduced.
C0592 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0592
- Brake assist warning, possibly weaker or slower assist
- Brake or ABS warning lamp on
Common causes of C0592
- PossibleShorted or leaking transistor in power module B
- PossibleInsulation fault in winding system B
- Less likelyMeasuring offset of the side B current sensing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake booster motor bMotor phase wiring
What each part of C0592 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 92 | The exact fault in that area. |
What to do next
- Note C0592 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0592
What does C0592 mean?
C0592 means "Brake Booster Motor B Phase U-V-W Current High". C0592 reports excessive current in the second motor or second winding system, B, of an electric brake booster. It is a generic code, so it means the same on every make.
Is it safe to drive with C0592?
Drive gently and only to a workshop. With C0592 the car can go into limp mode (reduced power) to protect itself.
Will C0592 fail an emissions test?
C0592 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0592 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will C0592 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.