What causes P1640 on a Honda?

Short to ground in the motor torque signal wire Failed torque signal driver in the motor control module Corroded connector at the MCM torque signal terminal Pinched harness between the engine and the IMA compartment Low MCM supply voltage dragging the signal down

How do I fix P1640 on a Honda?

Measure the torque signal voltage against Honda specifications Inspect the signal wire for shorts to ground along its routing Check MCM supply voltage and grounds Back-probe the MCM connector to isolate wiring from module faults Repair wiring first and replace the MCM only if the signal stays low

P1640 Motor Torque Signal Circuit Low Input

Q: What does P1640 mean on a Honda?

P1640 — Motor Torque Signal Circuit Low Input. Applies to Insight, Civic Hybrid with IMA.

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

What does P1640 mean on a Honda?

P1640 — Motor Torque Signal Circuit Low Input. This Honda-enhanced code applies to Insight, Civic Hybrid with IMA.

Common causes of P1640

Short to ground in the motor torque signal wire
Failed torque signal driver in the motor control module
Corroded connector at the MCM torque signal terminal
Pinched harness between the engine and the IMA compartment
Low MCM supply voltage dragging the signal down

How to fix P1640

Measure the torque signal voltage against Honda specifications
Inspect the signal wire for shorts to ground along its routing
Check MCM supply voltage and grounds
Back-probe the MCM connector to isolate wiring from module faults
Repair wiring first and replace the MCM only if the signal stays low