U067B: Lost Communication With Engine Disconnect Clutch Pressure Sensor

What it means

The vehicle bus reports loss of communication with smart engine disconnect clutch pressure sensor. Hybrid clutch engagement feedback is unavailable; mode transitions may be rougher.

At a glance

• Usually lights the warning light of the system that lost communication
• The engine or gearbox may go into limp mode

How it works

The smart engine disconnect clutch pressure sensor reports hydraulic pressure used to control clutch engagement in a hybrid powertrain. U067B sets when the receiving module loses the sensor's network messages, leaving clutch engagement feedback unavailable and potentially making transitions between engine and electric drive rough.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan all modules for communication and hybrid-system codes, and save freeze-frame data before clearing faults.
2. Check live data for engine disconnect clutch pressure and note whether the reading is missing or whether engine-to-electric transitions are rough.
3. Inspect the pressure sensor connector and network harness for looseness, corrosion, fluid contamination, or damage.
4. Check the sensor or associated module's power and ground against the manufacturer's specification.
5. Test the network circuit to the pressure sensor for an open or short using the manufacturer's procedure.
6. If wiring and supplies pass, follow the manufacturer's hybrid-system procedure to confirm whether the sensor or its communication module has failed.

Common fixes

• Reconnect or clean the clutch pressure sensor connector and repair damaged wiring.
• Restore a faulty power or ground connection to the sensor or its module.
• Repair an open or short in the network wiring to the clutch pressure sensor.
• Replace the confirmed failed pressure sensor or communication module.

Can I keep driving?

If the vehicle reports a hybrid-system warning or transitions between engine and electric drive become abrupt, limit driving and avoid demanding acceleration. Stop if the vehicle loses propulsion or displays a high-voltage system warning; the clutch may not engage as expected.