What causes P1660 on a Honda?

Open FI data line wire Shorted FI data line wire Corroded ECM or TCM plugs Weak charging system voltage Failed TCM or ECM driver

How do I fix P1660 on a Honda?

Check battery and charging voltage Inspect ECM and TCM plugs Test the FI data line for open or short Repair wiring found damaged Replace the failed module only after wiring passes

P1660 Automatic transmission FI data line failure

Q: What does P1660 mean on a Honda?

P1660. Automatic transmission FI data line failure. Applies to 1998 to 2002 Accord and Acura CL with automatic.

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

What does P1660 mean on a Honda?

P1660. Automatic transmission FI data line failure. This Honda-enhanced code applies to 1998 to 2002 Accord and Acura CL with automatic.

Common causes of P1660

Open FI data line wire
Shorted FI data line wire
Corroded ECM or TCM plugs
Weak charging system voltage
Failed TCM or ECM driver

How to fix P1660

Check battery and charging voltage
Inspect ECM and TCM plugs
Test the FI data line for open or short
Repair wiring found damaged
Replace the failed module only after wiring passes

Sources and review

Last updated 2026-09-24.