P1644 Honda Code - Motor Control Module Signal Malfunction
Quick Answer
The Motor Control Module (MCM) signals various information about the IMA system to the Engine Control Module (ECM) via the MOTFSA signal line. Common causes include Poor connection at the AC motor control module, Open or short circuit condition, Failed AC Motor Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1644 Honda indicates Motor Control Module Signal Malfunction.
- Common causes
- Common causes include Poor connection at the AC motor control module, Open or short circuit condition, Failed AC Motor Control Module.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1644 Honda Description
What are the Possible Causes of the DTC P1644 Honda?
- Poor connection at the AC motor control module
- Open or short circuit condition
- Failed AC Motor Control Module
How to Fix the DTC P1644 Honda?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1644 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1644 Honda code?
Need more information on how to fix the P1644 Honda code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1644 Honda code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1644 Honda Code
1. What does the OBDII code P1644 mean on a Honda?
P1644 indicates a Motor Control Module (MCM) Signal Malfunction, meaning there’s an issue with the communication or signal between the MCM and the Engine Control Module (ECM).
2. What are the symptoms of code P1644 in a Honda?
Common symptoms include reduced engine performance, poor fuel efficiency, possible activation of limp mode, and the check engine light illuminated.
3. What causes the P1644 code on a Honda?
Causes can include a faulty Motor Control Module (MCM), damaged wiring or connectors, poor electrical connections, or a failed ECM.
4. Can a loose electrical connection trigger the P1644 code?
Yes, loose or corroded electrical connections in the wiring between the MCM and ECM can cause this code.
5. How is the P1644 code diagnosed on a Honda?
A technician will use a scan tool to check for related codes, inspect the wiring and connectors for damage or corrosion, and run tests to verify the functionality of the MCM and ECM.
6. Can I drive my Honda with a P1644 code?
Driving with a P1644 code is not recommended, as it can result in reduced performance and may cause further damage to the vehicle.
7. How do you fix the P1644 code on a Honda?
Repairs may include replacing damaged wiring, repairing poor electrical connections, reprogramming, or replacing the Motor Control Module or ECM if faulty.
8. Does the P1644 code always indicate a failed Motor Control Module?
No, it can also be caused by wiring issues, connector problems, or a malfunctioning ECM.
9. Is a software update ever needed to fix the P1644 code?
In some cases, reprogramming or updating the ECM or MCM software may resolve the issue if it’s caused by a software glitch.
10. What tools are required to diagnose and fix the P1644 code?
Diagnosing and fixing this code typically requires a scan tool, multimeter, and possibly an oscilloscope to check the signal integrity between the MCM and ECM.
Discuss the causes and fixes for P1644 Honda OBDII Code
-
i have light in me dashboard and someone told me that this have a code P1644. Could you please somebody tell me what this code mean?
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
