What causes P1601 on a Honda?

Deteriorated IMA battery pack triggering the motor control module Corroded IMA battery terminals skewing voltage sensing Failed motor control module signaling the ECM to set the code Blown IMA system fuse cutting power to the hybrid controller Damaged IMA wiring harness between the MCM and the ECM

How do I fix P1601 on a Honda?

Read IMA-side subcodes with a Honda HDS scan tool before condemning parts Inspect IMA battery terminals and ground points for corrosion Check all IMA-related fuses including the under-hood hybrid fuses Test the MCM power and communication circuits per the service manual Diagnose IMA battery health first since P1601 often shadows a failing pack

P1601 Integrated Motor Assist System Malfunction

Q: What does P1601 mean on a Honda?

P1601 — Integrated Motor Assist System Malfunction. Applies to Insight, Civic Hybrid with IMA.

Category: Powertrain - Hybrid Propulsion
Severity: Check Engine Light
Applies to: Insight, Civic Hybrid with IMA

What does P1601 mean on a Honda?

P1601 — Integrated Motor Assist System Malfunction. This Honda-enhanced code applies to Insight, Civic Hybrid with IMA.

Common causes of P1601

Deteriorated IMA battery pack triggering the motor control module
Corroded IMA battery terminals skewing voltage sensing
Failed motor control module signaling the ECM to set the code
Blown IMA system fuse cutting power to the hybrid controller
Damaged IMA wiring harness between the MCM and the ECM

How to fix P1601

Read IMA-side subcodes with a Honda HDS scan tool before condemning parts
Inspect IMA battery terminals and ground points for corrosion
Check all IMA-related fuses including the under-hood hybrid fuses
Test the MCM power and communication circuits per the service manual
Diagnose IMA battery health first since P1601 often shadows a failing pack