What causes P1671 on a Honda?

Cut FI data line wire Unplugged TCM connector Corroded ECM connector pins Blown control circuit fuse Failed TCM output driver

How do I fix P1671 on a Honda?

Check fuses for the control circuit Inspect TCM and ECM connectors Test the data line for continuity Repair the open wire found Replace the TCM if signal never leaves it

P1671 Automatic transmission FI data line no signal

Q: What does P1671 mean on a Honda?

P1671. Automatic transmission FI data line no signal. Applies to 1998 to 2002 Accord and Odyssey with automatic.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: 1998 to 2002 Accord and Odyssey with automatic

What does P1671 mean on a Honda?

P1671. Automatic transmission FI data line no signal. This Honda-enhanced code applies to 1998 to 2002 Accord and Odyssey with automatic.

Common causes of P1671

Cut FI data line wire
Unplugged TCM connector
Corroded ECM connector pins
Blown control circuit fuse
Failed TCM output driver

How to fix P1671

Check fuses for the control circuit
Inspect TCM and ECM connectors
Test the data line for continuity
Repair the open wire found
Replace the TCM if signal never leaves it

Sources and review

Last updated 2026-09-24.