U067E code meaning
Lost Communication With Exhaust Pressure Control Valve B Sensor/Switch
Network system Generic code U06xx codes Check engine light
What U067E means
An exhaust pressure control valve is a flap in the exhaust that diesels close partly to raise back pressure, which speeds warm-up and helps reach filter regeneration temperatures. Valve B is a second flap of this kind, and U067E concerns its position sensor or switch when that reports digitally: the controller has lost its messages. Public manufacturer documentation for U067E is lacking. GM's 2025 diesel table 25OBDG04B shows the pattern for valve A, a SENT position sensor whose silence gives U0650 after 480 failed checks out of 600 at 6.25 ms, Type A. For valve B, drive faults run from P049F to P04A5 and analog position faults from P04A6 to P04AA. CARB wants a separate code for a mute digital input. Warm-up and regeneration may be impaired.
U067E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U067E
- Check engine light
- Particulate filter regeneration delayed or not started
- Longer warm-up in cold weather
Common causes of U067E
- Most likelySensor wiring at valve B damaged by exhaust heat
- PossibleConnector at valve B corroded or loose
- PossiblePosition sensor in the valve B unit failed
- Less likelyEngine controller input or software fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust pressure valve b sensorVehicle bus wiring
What each part of U067E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7E | The exact fault in that area. |
What to do next
- Note U067E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U067E
What does U067E mean?
U067E means "Lost Communication With Exhaust Pressure Control Valve B Sensor/Switch". An exhaust pressure control valve is a flap in the exhaust that diesels close partly to raise back pressure, which speeds warm-up and helps reach filter regeneration temperatures. It is a generic code, so it means the same on every make.
Is it safe to drive with U067E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U067E fail an emissions test?
Yes, it can. U067E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U067E to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U067E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.