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2016 HONDA CIVIC
1.5L I4 Turbo•FWD•CVT•gas•turbo
5 active safety recalls on this vehicle — view recalls
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Repairs403Labor504Torque3392Fluid7DTC1162Battery1Maintenance0Recalls5
P1681moderate severityPowertrain

A/T FI Signal A Low Input

on 2016 Honda Civic 1.5L I4 Turbo · FWD

What this code means

The automatic transmission control unit detects a low voltage on the A/T FI signal A line to the PCM. This is a Honda manufacturer-specific code with no direct generic OBD-II equivalent.

Symptoms

  • Transmission warning light
  • Harsh or erratic shifting
  • Reduced engine performance

Common causes

  • Short to ground in signal wire
  • Faulty TCM output
  • Poor connector contact
  • PCM input fault

Diagnostic steps

  1. Retrieve transmission and PCM codes
  2. Inspect A/T FI signal A wiring
  3. Measure signal voltage at PCM
  4. Test TCM and PCM circuits
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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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