P1040 Possible Causes
- Faulty injector 1
- Injector 1 harness is open or shorted
- Poor electrical connection in injector 1 circuit
How is code P1040 repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Engine light on (or service engine soon warning light)
P1040 Meaning
Injector 1 supply voltage circuit malfunction is the generic description for code P1040, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about OBDII code P1040.