What does code P1686 mean on Acura vehicles?
Low input detected on automatic transmission fuel injection signal B.
OBD-II Code Acura
P1686 — Acura — A/T FI Signal B Low Input
Low input detected on automatic transmission fuel injection signal B.
Common symptoms
- Erratic shifting.
Possible causes
- Faulty sensor or wiring issue.
Initial recommendation
Inspect A/T FI signal B circuit.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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