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U0625 Lost Communication With Fuel Rail Pressure Sensor Bank 1

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

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.

Likely causes

SENT signal wire shorted to ground or to voltage, or open

Fuel or oil contamination, corrosion or loose pins in the sensor connector

Rail pressure sensor electronics failed (on some engines only with the rail)

SENT input of the engine controller faulty

Symptoms

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

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–700

Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel rail pressure sensor bank 1sensor wiring

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, en.wikipedia.org.