U0625 code meaning
Lost Communication With Fuel Rail Pressure Sensor Bank 1
Network system Generic code U06xx codes Check engine light
What U0625 means
Direct-injection engines increasingly use rail pressure sensors that send pressure, and sometimes fuel temperature, digitally via SENT. U0625 says the engine controller has lost this link for the bank 1 sensor. GM's 2025 tables (25OBDG03A) set it when the SENT line stays low with at most four pulses received, in 400 of 500 samples taken every 6.25 ms, Type A; a line stuck high is GM's own code U101B, and corrupted or stale frames are logged as P128F. In 23OBDG07 and 24OBDG07 GM stores U0625 together with U101B when the line sits high or low for 0.5 s, again in one trip, while protocol errors go to U1374. As long as the code is active, GM suspends the fuel temperature checks of the same sensor. The bank 2 sensor has U0665; analog circuit faults are P0190 to P0194. Expect reduced power or hard running.
U0625 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0625
- Check engine light in the first trip
- Reduced power, rough running or hard starting
- Further SENT codes such as U101B stored at the same time
Common causes of U0625
- Most likelySENT signal wire shorted to ground or to voltage, or open
- PossibleFuel or oil contamination, corrosion or loose pins in the sensor connector
- PossibleRail pressure sensor electronics failed (on some engines only with the rail)
- Less likelySENT input of the engine controller faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel rail pressure sensor bank 1Sensor wiring
What each part of U0625 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 25 | The exact fault in that area. |
What to do next
- Note U0625 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 U0625
What does U0625 mean?
U0625 means "Lost Communication With Fuel Rail Pressure Sensor Bank 1". Direct-injection engines increasingly use rail pressure sensors that send pressure, and sometimes fuel temperature, digitally via SENT. It is a generic code, so it means the same on every make.
Is it safe to drive with U0625?
Drive gently and only to a workshop. With U0625 the car can go into limp mode (reduced power) to protect itself.
Will U0625 fail an emissions test?
Yes, it can. U0625 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 U0625 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0625 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.