U064FLost Communication With Intake Manifold Runner Position Sensor Bank 1
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- 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
- RareEngine controller SENT input faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.