P2691 Possible Causes
Programmable injector
How to Fix Code P2691
Check 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.
Technical Notes
What Does It Mean?
Injector programming requires an OBDII scanner capable of programming injectors.
Symptoms
Possible
Check Engine Light illuminated (or Service Engine Soon warning light)
P2691 Meaning
Each injector has a code stored in the Electrically Erasable Programmable Read-Only Memory (EEPROM) that provides information to the Electronic Control Unit (ECU) about this injector’s deviations from a theoretical average injector. The Powertrain Control Module (PCM) sets the OBDII code if the injector code is missing or invalid.