What causes P1606 on a Honda?

Open or shorted IMA-CAN bus wiring between the ECM and the MCM Corroded CAN connectors at the motor control module Failed motor control module pulling the IMA-CAN bus down Low 12-volt auxiliary battery voltage disrupting CAN communication Water intrusion at the IMA compartment connectors

How do I fix P1606 on a Honda?

Check the 12-volt auxiliary battery condition and charge first Inspect IMA-CAN wiring and connectors for corrosion or chafing Measure CAN bus resistance and voltage with the system powered down Use a Honda HDS scan tool to confirm which module drops off the bus Replace the affected module only after wiring is proven good

P1606 Integrated Motor Assist Controller Area Network Malfunction

Q: What does P1606 mean on a Honda?

P1606 — Integrated Motor Assist Controller Area Network 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 P1606 mean on a Honda?

P1606 — Integrated Motor Assist Controller Area Network Malfunction. This Honda-enhanced code applies to Insight, Civic Hybrid with IMA.

Common causes of P1606

Open or shorted IMA-CAN bus wiring between the ECM and the MCM
Corroded CAN connectors at the motor control module
Failed motor control module pulling the IMA-CAN bus down
Low 12-volt auxiliary battery voltage disrupting CAN communication
Water intrusion at the IMA compartment connectors

How to fix P1606

Check the 12-volt auxiliary battery condition and charge first
Inspect IMA-CAN wiring and connectors for corrosion or chafing
Measure CAN bus resistance and voltage with the system powered down
Use a Honda HDS scan tool to confirm which module drops off the bus
Replace the affected module only after wiring is proven good