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Home / DTC / U0595 — Invalid Data Received From Powertrain Control Monitor Module

U0595 — Invalid Data Received From Powertrain Control Monitor Module

Detailed page for trouble code U0595.

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Code

U0595

HYUNDAI U — Network/User

Invalid Data Received From Powertrain Control Monitor Module

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

Causes

  • Corrupted or malformed CAN messages from PCMM
  • Faulty Powertrain Control Monitor Module (PCMM)
  • Faulty receiving module (PCM/ECM) interpreting data incorrectly
  • Open, short, or high-resistance connection in CAN wiring or connectors
  • Missing or incorrect module programming / software mismatch after replacement or update
  • Low battery voltage, voltage spikes, or poor ground affecting message integrity

Symptoms

  • MIL (Check Engine) or network warning lamp illuminated
  • Multiple related DTCs present from other control modules
  • Loss of certain powertrain-related data on scan tool (missing or nonsense values)
  • Intermittent drivability anomalies if critical data is affected
  • Modules failing to communicate or respond to diagnostic tool

What to check

  • Read U0595 details and all related DTCs and freeze frame data from all modules with a capable scan tool
  • Check vehicle history for recent module replacement, programming, or repairs
  • Visually inspect CAN high/low wiring, connectors, and pin condition at PCMM, PCM, gateways, and junction points
  • Verify battery voltage (12.4–12.9 V at rest) and charging system; check for voltage drops during cranking
  • Check and measure CAN termination resistance (approx. 60 ohms across CANH–CANL with both terminators present)
  • Use a scan tool or oscilloscope to monitor CAN traffic for malformed frames, error flags, or missing messages

Signal parameters

  • High-speed CAN typical idle voltages: CANH ~2.5 V, CANL ~2.5 V; dominant state: CANH ≈ 3.5 V, CANL ≈ 1.5 V
  • Termination: two 120 Ω resistors (≈60 Ω measured across CANH–CANL at a single point)
  • Typical bus speeds: 250 kbps or 500 kbps (verify vehicle specification)
  • Expected message frequency and specific CAN IDs for PCMM data (verify with OEM wiring/service info)
  • Battery voltage: stable 12–14.5 V during normal operation; large fluctuations can corrupt data

Diagnostic algorithm

  1. Capture all active and pending DTCs from every networked module; note freeze frame data and occurrence conditions.
  2. Attempt to clear codes and re-test to see if U0595 returns or is intermittent.
  3. Check battery state-of-charge and charging system; repair low-voltage issues first.
  4. Visually inspect PCMM and gateway/PCM connectors and harnesses for damage, corrosion, or water entry; repair as needed.
  5. Measure CANH–CANL resistance with ignition off (expect ≈60 Ω). If open or shorted, isolate wiring sections and locate fault.
  6. Use a scan tool to observe live data from PCMM and receiving modules; look for missing or obviously incorrect values.
  7. Monitor CAN bus with an oscilloscope while replicating the fault to identify malformed frames, error bursts, or signal noise.
  8. Disconnect or isolate suspected modules (PCMM or gateway) one at a time per OEM procedures to see if messages normalize.
  9. Check for recent module replacement or software updates; verify correct part number and reflash/program to latest OEM calibration if required.
  10. Inspect/replace damaged connectors or harness sections; ensure proper grounding and battery connections.
  11. If testing isolates the fault to the PCMM and wiring is good, replace or repair the PCMM per OEM procedures and reprogram as required.
  12. After repairs, clear codes and perform full network communications check and a road test to confirm the issue is resolved.

Likely causes

  • Damaged CAN wiring or corroded connector at PCMM or gateway module
  • Unprogrammed or incorrectly programmed replacement PCMM
  • Intermittent ground or low battery causing malformed frames
  • Failed PCMM transmitting corrupted data

Fault status

⚠️ Status
Invalid Data Received From Powertrain Control Monitor Module — control module detected malformed or unexpected messages from the PCMM over the vehicle network; may set MIL and affect related modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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371

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