What causes P1625 on a Honda?

Momentary loss of ECM power from a loose battery terminal Failing ignition switch interrupting ECM supply voltage Corroded main relay contacts dropping ECM power Weak 12-volt battery dipping voltage during cranking Loose or oxidized ECM ground connection

How do I fix P1625 on a Honda?

Inspect and tighten battery terminals and check battery health first Test the main relay and replace it if the contacts show wear Wiggle-test the ignition switch output while monitoring ECM voltage Clean and tighten all ECM ground points Clear the code and road test after the power supply is secured

P1625 Engine Control Module Unexpected Reset

Q: What does P1625 mean on a Honda?

P1625 — Engine Control Module Unexpected Reset. Applies to Civic, Accord, CR-V.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V

What does P1625 mean on a Honda?

P1625 — Engine Control Module Unexpected Reset. This Honda-enhanced code applies to Civic, Accord, CR-V.

Common causes of P1625

Momentary loss of ECM power from a loose battery terminal
Failing ignition switch interrupting ECM supply voltage
Corroded main relay contacts dropping ECM power
Weak 12-volt battery dipping voltage during cranking
Loose or oxidized ECM ground connection

How to fix P1625

Inspect and tighten battery terminals and check battery health first
Test the main relay and replace it if the contacts show wear
Wiggle-test the ignition switch output while monitoring ECM voltage
Clean and tighten all ECM ground points
Clear the code and road test after the power supply is secured