What causes P1672 on a Honda?

Chafed FI data line harness Water in TCM connector Poor ground at the transmission Weak battery voltage Failed TCM or ECM

How do I fix P1672 on a Honda?

Check battery voltage under load Inspect harness for chafing Clean and dry the TCM connector Test the data line end to end Replace the failed module after wiring checks

P1672 FI data line failure

Q: What does P1672 mean on a Honda?

P1672. FI data line failure. Applies to 1999 to 2004 Odyssey and Accord with automatic.

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: 1999 to 2004 Odyssey and Accord with automatic

What does P1672 mean on a Honda?

P1672. FI data line failure. This Honda-enhanced code applies to 1999 to 2004 Odyssey and Accord with automatic.

Common causes of P1672

Chafed FI data line harness
Water in TCM connector
Poor ground at the transmission
Weak battery voltage
Failed TCM or ECM

How to fix P1672

Check battery voltage under load
Inspect harness for chafing
Clean and dry the TCM connector
Test the data line end to end
Replace the failed module after wiring checks

Sources and review

Last updated 2026-09-24.