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Home / DTC / U0601 — Lost Communication With Particulate Filter Pressure Sensor A

U0601 — Lost Communication With Particulate Filter Pressure Sensor A

Detailed page for trouble code U0601.

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Code

U0601

Generic U — Network/User

Lost Communication With Particulate Filter Pressure Sensor A

Brand: Generic
Type: U — Network/User
Views: UK: 14 EN: 70 RU: 27
AI status
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Page language: EN

Causes

  • Faulty particulate filter pressure/differential pressure sensor (Sensor A)
  • Open, shorted or corroded wiring or connector between sensor and ECU
  • Poor sensor ground or reference (5V) supply fault
  • CAN or LIN network communication fault (if sensor communicates digitally)
  • Blown fuse or low battery/voltage condition affecting sensor/ECU
  • Water intrusion or contamination at sensor connector

Symptoms

  • MIL (Check Engine) or DPF warning lamp illuminated
  • DPF regeneration disabled or forced regen not available
  • Reduced engine performance or limp-home mode in some vehicles
  • Increased soot accumulation / reduced fuel economy over time
  • Stored or repeating communication and pressure-sensor DTCs

What to check

  • Read all stored and pending DTCs and freeze-frame data with a scan tool
  • Inspect sensor connector and wiring for corrosion, damage, pin push-out or water
  • Verify battery voltage and fuses related to sensor and ECM power
  • Check for other network/ECU communication codes (CAN/LIN) present
  • Backprobe sensor connector to measure supply, ground and signal while key on
  • Wiggle harness and connectors while monitoring live data for intermittent faults

Signal parameters

  • Sensor supply/reference: typically 5 V (±0.25 V) from ECU or module
  • Sensor ground: near 0 V with good continuity to chassis/ECU ground
  • Analog signal: commonly 0.5–4.5 V proportional to differential pressure (exact range varies by vehicle)
  • If digital: sensor may communicate over LIN/CAN — check bus idle voltages (~2.5 V on CAN high/low) and message presence
  • Expected continuity: low ohms between sensor ground and ECU ground; infinite or high resistance between signal and ground with key off (no short)

Diagnostic algorithm

  1. Use a scan tool to record U0601 and any related codes, note freeze-frame and live sensor data.
  2. Visually inspect the DPF pressure sensor and connector for corrosion, water, soot, or mechanical damage.
  3. Check fuses and measure battery voltage; ensure vehicle electrical system is within normal range.
  4. Backprobe the sensor connector: verify reference supply (≈5 V), signal voltage, and ground continuity at the sensor with key ON/engine as required.
  5. Measure the same signals at the ECU/module connector to determine if fault is in harness or module. Check continuity/resistance between sensor and ECU pins.
  6. Wiggle the harness and connectors while monitoring live data to reveal intermittent opens/shorts.
  7. If the sensor is analog and wiring is good, substitute a known-good sensor (or bench-test the sensor per manufacturer spec).
  8. If sensor communicates digitally, check CAN/LIN bus health: measure bus voltages, check for other modules with comms faults, and use bus diagnostic tools to view messages.
  9. Repair or replace damaged wiring/connectors; apply dielectric grease to connectors if water intrusion noted.
  10. Clear codes and perform test drive or DPF regen cycle to confirm repair. If fault persists and wiring checks good, consider ECU/software update or module replacement as last resort.

Likely causes

  • Damaged or corroded sensor connector or wiring (most common)
  • Failed pressure sensor
  • Loss of sensor supply or ground at module
  • Intermittent open/short in harness (repair needed where wiring flexes)
  • Network communication error (CAN/LIN) or module not responding

Fault status

⚠️ Status
Lost communication with particulate filter pressure sensor A — no valid sensor data received. May prevent DPF monitoring/regeneration and trigger MIL/DPF warnings.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0415 P2002 P2458
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