What causes P1648 on a Honda?

Open communication wire between the BCM and the MCM Corroded communication terminals from battery vent gases Failed BCM transmitter pulling the line down Failed MCM receiver circuit Damaged IMA harness from battery swelling

How do I fix P1648 on a Honda?

Inspect the BCM-to-MCM communication wiring end to end Check both module connectors for corrosion Monitor the communication line with a Honda HDS scan tool Inspect the IMA pack for swelling that could crush the harness Replace the at-fault module only after the wire tests good

P1648 Motor Control Module Communication Signal Circuit Problem

Q: What does P1648 mean on a Honda?

P1648 — Motor Control Module Communication Signal Circuit Problem. Applies to Insight, Civic Hybrid with IMA.

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

What does P1648 mean on a Honda?

P1648 — Motor Control Module Communication Signal Circuit Problem. This Honda-enhanced code applies to Insight, Civic Hybrid with IMA.

Common causes of P1648

Open communication wire between the BCM and the MCM
Corroded communication terminals from battery vent gases
Failed BCM transmitter pulling the line down
Failed MCM receiver circuit
Damaged IMA harness from battery swelling

How to fix P1648

Inspect the BCM-to-MCM communication wiring end to end
Check both module connectors for corrosion
Monitor the communication line with a Honda HDS scan tool
Inspect the IMA pack for swelling that could crush the harness
Replace the at-fault module only after the wire tests good