P2699 signals a low voltage condition in the exhaust aftertreatment fuel injector control circuit, meaning the injector is not receiving sufficient current. This can affect emissions control and engine performance. The code is logged when the PCM detects that the injector's electrical circuit is not operating within expected parameters.
The injector may be internally shorted or have a bad coil, causing insufficient current draw.
Damaged, corroded, or loose wires and connectors in the injector circuit can reduce voltage.
A blown fuse or failed relay can cut power to the injector circuit, triggering low‑circuit detection.
Oxidation at the terminal can increase resistance and mimic a low circuit condition.
The PCM's output circuit can fail, but this is uncommon and usually follows other electrical checks.
It is possible but rare; most often the issue is the injector, wiring, or a blown fuse rather than the PCM.
No, usually only the faulty injector or wiring needs repair; the rest of the system typically remains functional.
It may clear if the fault does not recur, but the underlying issue should be addressed to prevent re‑occurrence.
Yes, it pertains to the aftertreatment fuel injection used to manage emissions.