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Home / DTC / U0435 — Invalid Data Received From Power Steering Control Module - Rear

U0435 — Invalid Data Received From Power Steering Control Module - Rear

Detailed page for trouble code U0435.

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22,491specific
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Code

U0435

Generic U — Network/User

Invalid Data Received From Power Steering Control Module - Rear

Brand: Generic
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corroded, loose or damaged wiring/connectors to the rear PSCM
  • Poor or missing power or ground to the rear PSCM
  • Faulty rear Power Steering Control Module (hardware or internal software fault)
  • CAN/LIN bus wiring fault (short to voltage/ground, open, high resistance)
  • Missing or incorrect module programming, calibration or software mismatch
  • Intermittent connection due to movement or water intrusion

Symptoms

  • Power steering warning lamp or service steering message
  • Rear/active steering not operating or operating intermittently
  • Related stability/ABS or traction control system warnings
  • Steering feel changes, delayed or inconsistent assist
  • Multiple network-related error messages on scan tool

What to check

  • Use a capable scan tool to read all U- and B- codes and note freeze-frame/live-data
  • Check for other modules reporting communication errors (ABS, ECM/PCM, BCM)
  • Visually inspect PSCM connector and harness for damage, corrosion, or water ingress
  • Verify PSCM power and ground circuits with a DVOM
  • Backprobe CAN_H and CAN_L at the PSCM and at a known-good module while monitoring with a scope or CAN analyzer
  • Check CAN bus termination resistance across CAN_H and CAN_L (≈60 ohms total on vehicle)

Signal parameters

  • CAN bus idle: both CAN_H and CAN_L near vehicle reference level (~2.5 V); dominant state differential ≈2 V (CAN_H rises, CAN_L falls)
  • Expected CAN termination resistance: ~60 ohms between CAN_H and CAN_L when key off
  • Message content (example fields): rear PSCM may transmit steering angle, steering torque/request, assist level and status flags
  • Message update rate: typically 10–100 ms (varies by manufacturer); missing or malformed frames can trigger invalid-data flags
  • Bus voltage: module supply Vs should be within manufacturer spec (usually battery voltage ± allowable range)

Diagnostic algorithm

  1. Record all codes and related symptoms. Note whether codes are current or history and any freeze-frame data.
  2. Inspect the rear PSCM connector and harness for damage, corrosion, moisture and secure connections. Repair any damaged wiring or connectors.
  3. With the key ON and harness connected, verify PSCM supply voltage and ground integrity at the module pins (use a DVOM). Compare to spec.
  4. Using a scan tool, view live CAN messages from the rear PSCM and related modules. Note missing, inconsistent or out-of-range values.
  5. Probe CAN_H and CAN_L at the PSCM with an oscilloscope or CAN bus analyzer. Look for correct recessive/dominant voltages, waveform integrity and correct message IDs/periodicity.
  6. Measure termination resistance across CAN_H and CAN_L (vehicle off). Replace faulty terminators or repair wiring if resistance is out of spec.
  7. Perform a wiggle test on harness and connectors while monitoring the bus for errors or code recreation to locate intermittent faults.
  8. If power/ground or bus wiring is good and messages are malformed or absent, check for required module programming/calibration and update module software if applicable.
  9. If module fails bench/functional tests or repeats errors after repairs and programming, consider replacing the rear PSCM and perform required coding/calibration.
  10. After repair or replacement, clear codes and perform a verification drive or functional test to confirm the fault does not return. Re-scan for stored codes.

Likely causes

  • Damaged harness/connector at the rear PSCM (chafing, rodent damage, corrosion)
  • Loss of proper ground at the steering module
  • Module recently replaced and not configured or coded
  • CAN_H/CAN_L shorted or high resistance causing corrupted frames
  • Module internal fault producing malformed messages

Fault status

⚠️ Status
Invalid Data Received From Rear Power Steering Control Module — indicates the network received messages from the rear PSCM that were out of expected format, timing, or value range. This can be caused by wiring, power/ground, bus integrity, software mismatch, or a failing module. Further diagnosis is required to identify the root cause.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4.0 hours

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Code

U0435

HYUNDAI U — Network/User

Invalid Data Received From Power Steering Control Module Rear

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corroded, loose or damaged wiring/connectors to the rear PSCM
  • Poor or missing power or ground to the rear PSCM
  • Faulty rear Power Steering Control Module (hardware or internal software fault)
  • CAN/LIN bus wiring fault (short to voltage/ground, open, high resistance)
  • Missing or incorrect module programming, calibration or software mismatch
  • Intermittent connection due to movement or water intrusion

Symptoms

  • Power steering warning lamp or service steering message
  • Rear/active steering not operating or operating intermittently
  • Related stability/ABS or traction control system warnings
  • Steering feel changes, delayed or inconsistent assist
  • Multiple network-related error messages on scan tool

What to check

  • Use a capable scan tool to read all U- and B- codes and note freeze-frame/live-data
  • Check for other modules reporting communication errors (ABS, ECM/PCM, BCM)
  • Visually inspect PSCM connector and harness for damage, corrosion, or water ingress
  • Verify PSCM power and ground circuits with a DVOM
  • Backprobe CAN_H and CAN_L at the PSCM and at a known-good module while monitoring with a scope or CAN analyzer
  • Check CAN bus termination resistance across CAN_H and CAN_L (≈60 ohms total on vehicle)

Signal parameters

  • CAN bus idle: both CAN_H and CAN_L near vehicle reference level (~2.5 V); dominant state differential ≈2 V (CAN_H rises, CAN_L falls)
  • Expected CAN termination resistance: ~60 ohms between CAN_H and CAN_L when key off
  • Message content (example fields): rear PSCM may transmit steering angle, steering torque/request, assist level and status flags
  • Message update rate: typically 10–100 ms (varies by manufacturer); missing or malformed frames can trigger invalid-data flags
  • Bus voltage: module supply Vs should be within manufacturer spec (usually battery voltage ± allowable range)

Diagnostic algorithm

  1. Record all codes and related symptoms. Note whether codes are current or history and any freeze-frame data.
  2. Inspect the rear PSCM connector and harness for damage, corrosion, moisture and secure connections. Repair any damaged wiring or connectors.
  3. With the key ON and harness connected, verify PSCM supply voltage and ground integrity at the module pins (use a DVOM). Compare to spec.
  4. Using a scan tool, view live CAN messages from the rear PSCM and related modules. Note missing, inconsistent or out-of-range values.
  5. Probe CAN_H and CAN_L at the PSCM with an oscilloscope or CAN bus analyzer. Look for correct recessive/dominant voltages, waveform integrity and correct message IDs/periodicity.
  6. Measure termination resistance across CAN_H and CAN_L (vehicle off). Replace faulty terminators or repair wiring if resistance is out of spec.
  7. Perform a wiggle test on harness and connectors while monitoring the bus for errors or code recreation to locate intermittent faults.
  8. If power/ground or bus wiring is good and messages are malformed or absent, check for required module programming/calibration and update module software if applicable.
  9. If module fails bench/functional tests or repeats errors after repairs and programming, consider replacing the rear PSCM and perform required coding/calibration.
  10. After repair or replacement, clear codes and perform a verification drive or functional test to confirm the fault does not return. Re-scan for stored codes.

Likely causes

  • Damaged harness/connector at the rear PSCM (chafing, rodent damage, corrosion)
  • Loss of proper ground at the steering module
  • Module recently replaced and not configured or coded
  • CAN_H/CAN_L shorted or high resistance causing corrupted frames
  • Module internal fault producing malformed messages

Fault status

⚠️ Status
Invalid Data Received From Rear Power Steering Control Module — indicates the network received messages from the rear PSCM that were out of expected format, timing, or value range. This can be caused by wiring, power/ground, bus integrity, software mismatch, or a failing module. Further diagnosis is required to identify the root cause.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

U0100 U0121 U0155 U0422 U0416
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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