P1440 on 2013-2014 Acura ILX (Hybrid, Hybrid Tech) — EVAP Canister Purge System Small Leak (Positive Pressure)
1 vehicles · 1 makes · $2,000-$4,000 repair
How to diagnose and fix P1440: most-reported vehicles
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Acura ILX · 2013–2014
The ILX Hybrid used the Civic Hybrid's Integrated Motor Assist system - a 1.5L engine with a thin motor-generator between engine and CVT and a lithium-ion IMA battery pack. It sold in tiny numbers for only two model years and was dropped after 2014. The IMA pack degrades: individual cell sticks fall out of balance, capacity drops, the state-of-charge display swings wildly from full to empty, assist and regen are cut, and the IMA warning light and check engine light illuminate. Acura Service Bulletin 12-012 (first issued May 2012, revised June 2015) sets up an IMA Battery Exchange Program for ILX Hybrid (and RLX Sport Hybrid) batteries: any internal failure requiring module disassembly is repaired with a remanufactured module, for in-warranty and out-of-warranty repairs alike, with the normal warranty terms applying. Owners also report a second, separate problem: repeated 12V accessory battery failures and no-crank conditions, which on an IMA car is often a symptom of the hybrid system not charging the 12V properly rather than a bad 12V battery.
Common Symptoms
- IMA warning light illuminated
- Check engine light
- State of charge gauge swings rapidly between full and empty
- Loss of electric assist and regenerative braking
- Reduced fuel economy
- Repeated 12V accessory battery failure
- No crank / will not start requiring a jump
How to Fix
Have the dealer read the IMA system codes and run a battery capacity/module test before buying anything. Acura Service Bulletin 12-012 (IMA Battery Exchange Program) governs the repair - it supplies remanufactured modules (new ones are not available) for in- and out-of-warranty cars, but the normal warranty terms apply, so an out-of-warranty car pays for the exchange module. A battery-management recalibration update was also released for IMA cars that changes charge/discharge management and can restore usable capacity on a marginal pack. Full IMA pack replacement runs roughly $2,000-$4,000; reconditioned packs are available for less. If the complaint is repeated 12V battery death, diagnose the DC-DC converter and parasitic draw before replacing the 12V again.
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Sources for this issue (3)
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P1440 code reference
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Frequently asked questions
What does P1440 mean?
P1440 stands for "EVAP Canister Purge System Small Leak (Positive Pressure)." Nissan's ECM pressurizes the EVAP system and monitors the fuel tank pressure sensor for decay. P1440 indicates a leak or malfunction in the canister purge system detected under positive pressure. Driveability is normally unaffected but the vehicle will fail an emissions test.
What are the most common causes of P1440?
The most common causes of P1440 are: Loose or failed fuel filler cap, Cracked or disconnected EVAP hoses, Failed EVAP canister vent control valve, Failed EVAP canister purge volume control valve, Failed fuel tank pressure sensor, Cracked charcoal canister. The specific cause varies by vehicle.
How much does it cost to fix P1440?
Repair costs for P1440 range from $2,000 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P1440?
Au7o has documented P1440 across 1 vehicle models from 1 manufacturers: Acura.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.