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DTC codes / U06xx · Network communication / U067E

U067ELost Communication With Exhaust Pressure Control Valve B Sensor/Switch

U067E is a network communication code indicating that a control module has lost contact with the exhaust pressure control valve B sensor or switch over the vehicle's Controller Area Network (CAN) bus. The module monitoring this circuit expected regular status messages from the sensor but stopped receiving them for a calibrated time period, so it flagged the communication fault and may have entered a default strategy for exhaust pressure management.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaNetwork communication

Symptoms you may notice

  • Illumination of the check engine light or a dedicated service warning for the exhaust system
  • Often no symptoms besides the warning light, especially if the valve remains in a default position
  • Reduced engine performance or a limp-home mode if the powertrain module limits torque due to missing exhaust pressure data
  • Rough running or poor fuel economy when the exhaust pressure control valve cannot be commanded correctly
  • Intermittent warning light that comes and goes with temperature changes or vibration over rough roads
  • A stored freeze-frame showing the fault set during a specific driving condition such as a cold start or a regeneration event

Common causes, most likely first

  1. A damaged, corroded, or disconnected electrical connector at the exhaust pressure control valve B sensor or switch
  2. An open or shorted wire in the sensor's power, ground, or CAN communication circuit, often from chafing or heat damage
  3. A failed exhaust pressure control valve B sensor or switch that no longer transmits data on the network
  4. Low battery voltage or a poor ground connection causing the sensor module to drop offline intermittently
  5. A software or calibration issue in the control module that monitors the sensor, requiring a reflash or update
  6. A faulty control module on the same CAN segment that disrupts communication for other nodes
  7. Aftermarket electrical accessories or improper previous repairs introducing noise or resistance into the communication bus

How to diagnose and fix it

  1. Perform a full scan of all modules to confirm U067E is current and note any other communication or sensor codes that share the same bus segment
  2. Inspect the exhaust pressure control valve B sensor connector and harness for corrosion, pushed pins, chafing, and heat damage, then clean and reseat as needed
  3. Measure battery voltage and check the sensor's power and ground circuits with a multimeter under load to rule out low voltage or a bad ground
  4. Use an oscilloscope or a CAN bus tester to verify communication signals at the sensor and at the control module, looking for dropped or distorted messages
  5. Check for technical service bulletins or calibration updates for the monitoring module, and reflash if the manufacturer has released a communication fix
  6. Substitute a known-good sensor or switch only after circuit tests pass, then clear codes and road-test to confirm the fault does not return
  7. If the fault persists with good wiring and a known-good sensor, diagnose the control module itself for internal communication faults before replacement

What the code does not always mean

  • A U067E is frequently set by a marginal battery or charging system rather than by the sensor itself, because low voltage can cause a module to drop off the CAN bus momentarily and log a communication fault.
  • Technicians often replace the exhaust pressure control valve B sensor when the real problem is a single chafed wire near the exhaust hanger or a corroded ground stud that only fails when the engine bay is hot.
  • This code can appear after a jump-start or battery replacement if the modules were not allowed to relearn their communication handshake, and it may clear itself after several drive cycles.
  • A faulty aftermarket radio, alarm, or trailer wiring module sharing the same bus can corrupt messages and set U067E even though the exhaust sensor is perfectly healthy.
  • The monitoring module may set U067E when it is actually the receiving module that has lost its CAN transceiver, so always verify communication at both ends of the bus before condemning the sensor.

Can I keep driving with U067E?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration, towing, or long highway trips because the exhaust pressure control valve may default to a fixed position and affect emissions or engine protection strategies. If the engine enters limp mode or the warning light flashes, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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