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Home / DTC / U067B — Lost Communication With Engine Disconnect Clutch Pressure Sensor

U067B — Lost Communication With Engine Disconnect Clutch Pressure Sensor

Detailed page for trouble code U067B.

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U067B

Generic U — Network/User

Lost Communication With Engine Disconnect Clutch Pressure Sensor

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 24 RU: 18
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Page language: EN

Causes

  • Faulty Engine Disconnect Clutch Pressure Sensor
  • Open, short, or high-resistance wiring between the sensor and the vehicle network/module
  • Poor connector contact, corrosion, water intrusion at sensor or harness connectors
  • Blown sensor power or ground circuit
  • CAN/LIN bus fault (short to battery/ground, missing termination, high bus voltage)
  • Faulty gateway, body control module (BCM), or engine control module (ECM) that routes messages

Symptoms

  • Diagnostic trouble code U067B stored/active
  • No live data from Engine Disconnect Clutch Pressure Sensor on scan tool
  • Loss of clutch pressure-related functions or clutch disconnect behavior (may cause limp mode or restricted operation)
  • Transmission or shift abnormalities if clutch pressure info is required
  • Intermittent faults or multiple network communication codes present

What to check

  • Read all stored and pending DTCs and freeze frame data with a capable scan tool
  • Check for presence of the sensor’s data or message on the CAN bus with scan tool or bus monitor
  • Visually inspect sensor, connector, and harness for damage, corrosion, moisture, or pin push-out
  • Backprobe sensor connector to verify reference voltage (usually 5V), ground continuity, and signal presence while operating (if applicable)
  • Measure CANH and CANL voltages at a known-good junction and at the sensor connector with ignition ON (see signal params)
  • Perform a wiggle test on wiring and connectors while monitoring the bus/messages for interruptions

Signal parameters

  • Sensor supply/reference: typically 5.0 V ±0.5 V (verify factory spec for vehicle)
  • Sensor ground: near 0 V (good low-resistance connection to chassis/ECU ground)
  • Sensor output: depends on type—may be 0–5 V analog or a specified PWM; verify expected range with manufacturer data
  • CAN bus typical idle (recessive): CANH ≈ 2.5 V, CANL ≈ 2.5 V
  • CAN bus dominant state: CANH ≈ 3.5 V, CANL ≈ 1.5 V (differential ~2.0 V)
  • Bus termination: approximately 60 ohms between CANH and CANL (two 120 ohm resistors in parallel)

Diagnostic algorithm

  1. Connect a professional scan tool; record all U-codes and freeze frame data. Note when code first set and related codes.
  2. Verify the sensor should be present for the installed configuration (some vehicles use optional components). Check wiring diagrams for connector pinout, power, ground, and signal/CAN pins.
  3. With ignition ON, backprobe and confirm sensor supply voltage and ground continuity. If supply or ground is missing, repair power/ground circuits before continuing.
  4. Check for the sensor’s message on the CAN bus using the scan tool or a bus analyzer. If no message, check wiring continuity between the sensor and the module/gateway.
  5. Inspect and repair any damaged connectors, pins, or harness sections. Clean corrosion and ensure secure mating.
  6. Measure CANH/CANL voltages at the sensor connector and at the module. If voltages are out of range, trace for shorts to battery/ground or open circuits and check termination resistors.
  7. Perform a wiggle/road test while monitoring the bus to reproduce intermittent faults. Repair any intermittent wiring faults found.
  8. If wiring and bus integrity are confirmed, substitute a known-good sensor or test with bench sensor if possible. Re-scan for codes.
  9. If substitute sensor does not restore communication, suspect gateway/module fault; check for software updates or reprogramming and consider module testing/replacement following OEM procedures.
  10. After repairs, clear codes, perform a functional test and a road/operational test to confirm the fault does not return.

Likely causes

  • Connector corrosion or disconnect at the sensor
  • Open or shorted signal/CAN wiring between sensor and module
  • Failed sensor (internal electronics)
  • CAN bus wiring fault or missing termination resistor
  • Fault in the gateway/module that aggregates sensor messages

Fault status

⚠️ Status
Lost Communication With Engine Disconnect Clutch Pressure Sensor — no valid message received from sensor on vehicle network. Possible wiring, connector, sensor, or gateway/module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0121 U0131 U0140
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