Useful checks before replacing parts
- Measure relay control voltage, feed, ground, output voltage, coil resistance, and voltage drop while the pump is commanded on.
- Inspect short-to-ground faults, relay socket terminals, fuse supply, module driver output, pump wiring, and connector corrosion.
- Compare low relay circuit events with pump operation, pressure build, pressure unit cycling, and freeze-frame system voltage.
Related OBD-II codes
These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.