U064F code meaning
Lost Communication With Intake Manifold Runner Position Sensor Bank 1
Network system Generic code U06xx codes Check engine light
What U064F means
Diesel swirl flaps partly close one intake port per cylinder at low load so the charge spins and mixes better; a motor moves them and a sensor reports the angle. In GM's 2025 diesel table 25OBDG04B that sensor transmits by SENT, and U064F covers a missing or corrupt stream: an internal fault flag or message error, or position data not refreshed for over 6.25 ms with the line held steadily high or low. It must show in 480 of 600 checks taken every 6.25 ms, after cranking and with more than 11 V at the relay. As Type B it turns on the MIL only after a second failed trip. While U064F is active, GM does not judge the raw value (P2016 below 1 %, P2017 above 99 %); motor circuit faults are P2008 to P2010, failed end-stop learning P200A.
U064F 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 U064F
- MIL after two trips with the fault
- Swirl flaps left in default position, slightly rougher or smokier low-load running
- Often no noticeable change in driving
Common causes of U064F
- Most likelyOil or soot in the actuator connector, corroded pins
- PossiblePosition sensor in the swirl flap actuator failed
- PossibleSENT signal wire chafed, open or shorted on the engine
- Less likelyEngine controller SENT input faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intake runner position sensor bank 1Vehicle bus wiring
What each part of U064F means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4F | The exact fault in that area. |
What to do next
- Note U064F 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 U064F
What does U064F mean?
U064F means "Lost Communication With Intake Manifold Runner Position Sensor Bank 1". Diesel swirl flaps partly close one intake port per cylinder at low load so the charge spins and mixes better; a motor moves them and a sensor reports the angle. It is a generic code, so it means the same on every make.
Is it safe to drive with U064F?
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 U064F fail an emissions test?
Yes, it can. U064F 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 U064F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U064F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.