U0593 code meaning
Invalid Data Received From Drive Motor Control Module B
Network system Generic code U05xx codes Check engine light
What U0593 means
Electric vehicles with one motor per axle typically report the second inverter and motor as drive motor module B; on the 2019 Audi e-tron that is the rear unit, whose loss Audi logs as U0292 when a chafed low-voltage harness cuts it off. U0593 is set when that module keeps transmitting but its torque or status data are untrustworthy. GM documents U0593 in its 2025 brake controller tables (25OBDG03B), where it is described as invalid data from the hybrid e-motor powertrain control module: the brake module expects the brake axle torque and estimated gear messages, flags a stuck alive counter or a wrong authentication code after 10 consecutive events within about 0.1 s, and treats it as Type B. Regenerative braking and torque blending on that axle may be cut back.
U0593 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of U0593
- Drive system warning, reduced power
- Reduced or no regenerative braking
- Vehicle drives on one axle only
Common causes of U0593
- Most likelyLow-voltage harness to the second drive unit chafed or connector loose
- PossibleDrive motor B inverter or receiver software out of date
- Less likelyInverter B internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor module b
What each part of U0593 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 93 | The exact fault in that area. |
What to do next
- Note U0593 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 U0593
What does U0593 mean?
U0593 means "Invalid Data Received From Drive Motor Control Module B". Electric vehicles with one motor per axle typically report the second inverter and motor as drive motor module B; on the 2019 Audi e-tron that is the rear unit, whose loss Audi logs as U0292 when a chafed low-voltage harness cuts it off. It is a generic code, so it means the same on every make.
Is it safe to drive with U0593?
Drive gently and only to a workshop. With U0593 the car can go into limp mode (reduced power) to protect itself.
Will U0593 fail an emissions test?
Yes, it can. U0593 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0593 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U0593 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.