U0593

Code

Generic U — Network/User

Invalid Data Received From Drive Motor Control Module B

Brand: Generic

Type: U — Network/User

Views: UK: 23 EN: 31 RU: 18

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty Drive Motor Control Module B (internal failure or firmware mismatch)
Damaged or corroded connectors at Drive Motor Control Module B
Open or shorted CAN bus wiring between module B and the rest of the network
Missing or incorrect CAN bus termination (open/misaligned resistors)
Low battery supply or poor ignition-switched power to module B
Poor or high-resistance ground at module B or receiving ECU

Symptoms

Malfunction Indicator Lamp (MIL) or warning lights on instrument panel
Reduced propulsion power, limp mode, or derated-drive behavior
Erratic motor or inverter behavior (torque spikes, unexpected torque reduction)
Loss of communication errors displayed on diagnostic tool
Possible inability to operate drive motor or vehicle start inhibited
Multiple related communication codes present

What to check

Read and record U0593 and any other stored codes and freeze-frame data with a capable scan tool
Visually inspect connectors and harness for corrosion, damage, water, or overheating at Drive Motor Control Module B and along CAN wiring
Check fuses and relays supplying module B and confirm battery/ignition power present at module pins
Verify good ground(s) at the module and at body/chassis ground points
Measure CAN bus idle voltages at module B connector (CANH and CANL) with ignition ON but engine off
Measure resistance across CANH and CANL with ignition OFF to confirm termination (~60 Ω typical for two 120 Ω terminators)

Signal parameters

Typical CAN idle voltages (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V
Typical CAN dominant voltages: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ≈ 2.0 V)
Expected bus termination resistance with ignition off: ≈ 60 Ω (two 120 Ω in parallel)
Common CAN data rates: 125 kbps, 250 kbps, 500 kbps or 1 Mbps (confirm vehicle-specific rate)
Module message frequency: varies by platform; use vehicle-specific wiring/data manual or a bus analyzer to confirm Drive Motor Control Module B message IDs and period

Diagnostic algorithm

Connect scan tool, read codes and note related U-codes or freeze-frame. Do not assume single-code isolation.
Clear codes, perform a road or function test to see if code returns and under what conditions.
Visually inspect connector(s) and harness at Drive Motor Control Module B and repair any corrosion, bent pins, or water intrusion.
Verify supply and ground: with key on, check battery voltage at module power pins and verify
With key on, measure CANH and CANL at the module connector: verify recessive and dominant levels and compare to the rest of the network. If voltages are incorrect, isolate wiring segment.
With ignition off measure resistance between CANH and CANL to confirm termination (~60 Ω). Remove modules one at a time if necessary to isolate a shorted transceiver.
Use an oscilloscope or CAN bus analyzer to capture traffic and look for malformed frames, bus errors, or absence of module B messages. Note message IDs and compare to expected.
Perform wiggle test and load/simulate network activity to reproduce fault. Check for intermittent or heat-related faults.
If wiring and power/ground are good but messages remain invalid, check for available software updates or known module calibrations. Reflash/reprogram module B per manufacturer procedure if available.
If module B is confirmed faulty after verification and programming not corrective, replace module and perform required coding/programming and system relearn procedures.
After repair, clear codes and verify normal operation and absence of U0593 in various driving conditions.

Likely causes

Wiring harness damage or water intrusion at motor control connector
Poor ground or blown power fuse to Drive Motor Control Module B
Intermittent connector contact (corrosion/pin push-out) on CANH/CANL or power pins
Failed or out-of-date software in Drive Motor Control Module B causing malformed CAN messages

Fault status

⚠️ Status

Receiving control module detected invalid or corrupted data from Drive Motor Control Module B over the vehicle network; communication data not trusted.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2.0-6.0 hours