P128E CADILLAC code possible causes
- Faulty fuel rail pressure sensor
- Fuel rail pressure sensor harness is open or shorted
- Poor electrical connection in fuel rail pressure sensor circuit
How is P128E CADILLAC code repair performed?
Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
- Check Engine Light illuminated (or Service Engine Soon warning light)
What does P128E CADILLAC code mean?
Under certain engine operating conditions, the Engine Control Module (ECM) monitors the actual fuel rail pressure reported by the fuel rail pressure sensor and compares the value to a programmed set value. If the values are outside the calibrated range for a defined duration, DTC P128E will set.