P1447 on Honda: How to Diagnose & Fix
EVAP System Purge Flow Monitoring
1 Honda model · 1 documented issue · 1 critical · $1,000-$3,000 repair
P1447 on Honda by model: symptoms, diagnosis and fix
The CR-Z uses Honda Integrated Motor Assist (IMA) system with a nickel-metal hydride (NiMH) battery pack located behind the rear seats. The battery pack degrades over time, losing capacity and causing the IMA system to become less effective at assisting acceleration and regenerating energy. The battery management system can also lose its calibration, causing incorrect state-of-charge readings and frequent IMA warning lights. In severe degradation, the IMA system shuts down entirely, leaving the car running on the 1.5L engine alone.
Common Symptoms
- IMA warning light illuminated on dashboard
- Check engine light with IMA-related codes
- Battery gauge showing low charge constantly
- Reduced power assist during acceleration
- Auto-stop feature no longer working
- Fuel economy significantly worse than rated
How to Fix
Perform a battery recalibration (deep discharge and full recharge cycle) using a Honda diagnostic tool. If recalibration does not resolve the issue, replace the IMA battery pack — Honda OEM replacements are available, and aftermarket rebuilt packs cost $1,000-2,000 less. Companies like Bumblebee Batteries offer refurbished IMA packs with warranties. After battery replacement, reset the battery module ECU and allow the system to relearn over 2-3 drive cycles.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
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Sources for this issue (1)
P1447 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1447 mean on a Honda?
P1447 stands for "EVAP System Purge Flow Monitoring." This is a manufacturer-specific code (common on Nissan, Infiniti, and Honda) meaning the EVAP system's purge flow monitor did not detect the expected flow of fuel vapor during its self-test. The evaporative emissions system captures gasoline vapors and routes them into the engine to be burned, and this monitor checks that vapor is actually flowing when commanded. When too little or no purge flow is detected, the code sets. It points to a restriction, leak, or stuck component in the EVAP/purge path rather than an engine performance fault. On Honda it is documented across 1 model: CR-Z.
What are the most common causes of P1447?
The most common causes of P1447 are: Faulty or stuck EVAP purge volume control valve/solenoid, Clogged or restricted EVAP/purge hoses or lines, Cracked, disconnected, or leaking vapor hoses, Faulty fuel tank pressure or vapor pressure sensor, Saturated or restricted charcoal canister, Loose or faulty gas cap / sealing fault, Damaged wiring or connector to the purge valve. The specific cause varies by vehicle.
How much does it cost to fix P1447 on a Honda?
Published repair estimates on Honda range from $1,000 to $3,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1447 on a different make?
View P1447 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.