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Home / DTC / U0696 — Lost Communication With Particulate Filter Pressure Sensor C

U0696 — Lost Communication With Particulate Filter Pressure Sensor C

Detailed page for trouble code U0696.

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Code

U0696

Generic U — Network/User

Lost Communication With Particulate Filter Pressure Sensor C

Brand: Generic
Type: U — Network/User
Views: UK: 10 EN: 18 RU: 14
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Page language: EN

Causes

  • Open or shorted wiring between sensor and control module
  • Corroded, loose or damaged connector at the sensor or module
  • Failed particulate filter pressure sensor (internal electronics or diaphragm)
  • Power (reference) or ground fault to the sensor
  • CAN bus or serial network communication fault (if sensor is networked)
  • Intermittent wiring fault caused by chafing, bending or contamination

Symptoms

  • Malfunction Indicator Lamp (MIL) or DTC illumination
  • DPF regeneration inhibited or forced regen not available
  • Reduced engine performance or limp mode in some systems
  • Aftertreatment warning messages on dash
  • No or invalid pressure readings for DPF pressure circuit C in live data

What to check

  • Read active/freeze-frame codes with a capable scan tool and record related codes
  • Check live data: confirm sensor C value updates or shows 'no communication' or implausible values
  • Inspect sensor connector and wiring for corrosion, damage, water ingress, or poor sealing
  • Verify sensor supply (reference) voltage and ground with key on engine off
  • Backprobe signal wire while activating or simulating pressure changes (if safe)
  • Check CAN bus or network health: bus voltage, termination, and other node communications

Signal parameters

  • Sensor reference voltage typically 5 V (verify on specific vehicle)
  • Signal output commonly an analog voltage proportional to pressure (approx. 0.2–4.8 V range depending on pressure)
  • Ground continuity to chassis ground required
  • Update rate: sensor or module typically reports at regular intervals (check live data for expected refresh rate)
  • If sensor is a networked device, expected CAN/serial messages at module-defined intervals

Diagnostic algorithm

  1. Connect a scan tool and confirm U0696 is present; record freeze frame and related codes.
  2. Observe live data for Particulate Filter Pressure Sensor C. Note whether value is frozen, absent, implausible or intermittent.
  3. Visually inspect the sensor, connector and wiring harness for damage, contamination, or corrosion. Repair any obvious issues.
  4. With ignition on, verify reference voltage and ground at the sensor connector. If no reference or ground, trace and repair supply/ground circuit.
  5. Probe the sensor signal wire while exercising the exhaust (or using a hand vacuum/pressure tool where applicable) to verify signal changes correlate to pressure. Replace sensor if signal does not change when pressure is applied and power/ground are correct.
  6. If the sensor uses the CAN or a digital bus, check network voltages and other node communications. Use a CAN bus diagnostic tool or oscilloscope to look for noise, missing termination or intermittent activity.
  7. Perform a wiggle test of the harness from sensor to module while monitoring live data to find intermittent wiring faults.
  8. If wiring and sensor test good, scan and communicate with the control module. Reflash or update software if manufacturer bulletin suggests. Consider replacing the module only after eliminating wiring and sensor faults.
  9. After repairs, clear codes and perform a road/regen cycle while monitoring sensor C data to confirm normal operation and that the code does not return.

Likely causes

  • Connector corrosion or poor pin contact at the sensor
  • Broken/shorted signal or ground wire due to harness routing
  • Failed pressure sensor
  • Lost 5V reference or ground to the sensor
  • CAN bus low-speed or high-speed node failure (if sensor communicates digitally)

Fault status

⚠️ Status
Lost Communication With Particulate Filter Pressure Sensor C — sensor data missing or timed out; control module not receiving valid pressure input for DPF circuit C.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0121 P2458 P2463
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