Motor Control Module Signal Malfunction
Table of contents
P1644 HONDA Possible Causes
- Poor connection at the AC motor control module
- Open or short circuit condition
- Failed AC Motor Control Module
How do I fix code P1644 HONDA?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1644 HONDA code
The cost of diagnosing the P1644 HONDA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
No duty signals are input from the MCM for at least 5 seconds.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1644 HONDA Description
The Motor Control Module (MCM) signals various information about the IMA system to the Engine Control Module (ECM) via the MOTFSA signal line. If no duty signals are input from the MCM for at least a set time period, the ECM detects a malfunction and stores a DTC.