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U0593 Invalid Data Received From Drive Motor Control Module B

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Low-voltage harness to the second drive unit chafed or connector loose
Drive motor B inverter or receiver software out of date
Inverter B internally faulty

Symptoms

  • Drive system warning, reduced power
  • Reduced or no regenerative braking
  • Vehicle drives on one axle only

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor module b

Related codes

U0292U0411U059CU059D

References: gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.