My Civic Hybrid IMA light is on. Is the hybrid battery dying, and what does it cost?

Short answer: An IMA light on a Civic Hybrid usually means the hybrid battery is losing capacity, but test the 12-volt battery and get every code read before you buy a pack. Owners report rebuilt packs from hybrid battery shops for roughly $1,250 to $1,600 plus installation, while one dealer-quoted repair was nearly $6,000. The gas engine can keep moving the car for a while with weak assist, but if the power steering or accessories start dropping out, pull over and get it towed.

Symptom: The IMA light (and often the check engine light) is on, acceleration feels weak, the charge gauge drops to empty in town, mileage falls, or the car loses assist completely.

What to check first

1. Run your VIN at nhtsa.gov/recalls, especially on 2006-2007 cars (IMA converter recall 11V106000).
2. Have the 12-volt battery load-tested and clean its terminals.
3. Get every stored code read, not just one. A Honda-capable scanner shows the IMA codes a basic reader may miss.
4. Watch the charge gauge: a pack that drops from full to empty in a few blocks is losing capacity.
5. Get quotes from a dealer and from a hybrid battery shop for rebuilt and new packs.

Likely causes

1. Worn-out IMA (hybrid) battery pack. IMA stands for Integrated Motor Assist, Honda's name for the electric motor and the big battery behind the rear seat. The pack slowly loses capacity with age, and the computer turns on the IMA light when it sees cells going weak.
2. Weak 12-volt battery or bad connections. The small 12-volt battery runs the computers. When it's low, all kinds of warning lights can come on, so it's the cheap thing to rule out first.
3. IMA voltage converter or other hybrid electronics. Some 2006-2007 cars are covered by a recall for the converter that feeds the car's 12-volt system from the IMA system. If it fails, accessories and power steering can quit.
4. Other faults setting codes. A failing pack usually sets several codes at once, but a scan can also point to sensors, wiring or the motor itself.

What it usually costs

Owners report about $1,250 for a rebuilt pack and about $1,600 for a new one from a hybrid battery shop, plus installation, and about $1,300 to $1,600 from another shop with mobile installation. One 2012 owner said the dealer repair was nearly $6,000.

Is it safe to keep driving?

With weak assist the car still runs on the gas engine, but it's slow to merge. If the power-steering light comes on, the steering goes heavy, or accessories quit, stop driving and have it towed. That points to the electrical side failing, not just a tired battery.

DIY or shop?

Testing the 12-volt battery and reading codes is DIY. The hybrid pack is high voltage and behind the rear seat; have a hybrid shop or dealer replace it. A hybrid's high-voltage system can stay live even with the car off. Leave the orange cables and the big battery to a hybrid-trained shop.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists 11V106000 for some 2006-2007 Civic Hybrids: the voltage converter that feeds the car's electrical parts from the IMA system can fail. It also lists 07V034000 for some 2006 cars: a metal cover behind the rear seat can pinch a rubber cap on an IMA electrical terminal. Many of these years are also in the Takata airbag recalls. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. NHTSA's complaint lookup doesn't separate the hybrid from the regular model, so this count covers the whole model line. A count is not proof of a defect.
• NHTSA complaints: 1075 keyword-matched complaints for Honda Civic (all versions) 2003–2011 (of 4789 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-30; keywords: ima, hybrid, battery, loss of power) (NHTSA returned no data for 1 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Honda civic hybrid 2003 IMA battery dead on Car Talk, a 2003 Civic Hybrid with about 187,000 miles had the IMA light on, then the power-steering (EPS) light came on and the steering went heavy. Members said to get all the codes read, and one said a rebuilt pack from a hybrid battery company was about $1,250 and a new one about $1,600, plus installation.
• In Driving 2006 Civic Hybrid with a dead IMA / hybrid battery on Car Talk, the original owner of a 2006 Civic Hybrid with 98,000 miles had the IMA and check engine lights on, and a parts-store reader said the IMA battery was deteriorating. The owner asked how long they could keep driving it with a dead pack.
• In 12' civic hybrid IMA System Quit on Car Talk, a 2012 Civic Hybrid's IMA system quit at 149,000 miles. The owner said the repair was nearly $6,000 on a car worth about $4,500.
• In Honda Civic Hybrid 2003 IMA battery getting weak? on Car Talk, a 2003 Civic Hybrid with a manual transmission was getting worse mileage. On the highway the IMA gauge showed nearly full, but in the city it sat at the bottom and the owner had to downshift to keep up. Members suspected a weakening pack.
• In 2005 Honda Civic Hybrid lost power. Could there be another reason besides needing a new hybrid battery? on Car Talk, a 2005 Civic Hybrid lost the air conditioning, then the speedometer, then power steering, and the owner pulled over. Members suggested a Civic Hybrid forum and a hybrid battery shop, which listed a replacement for about $1,300 to $1,600 with mobile installation, and one mechanic said aftermarket packs cost a lot less than dealer packs.

Quick tip

Don't let anyone sell you a pack on one code from a parts-store reader. Get the full scan and test the little battery first. If the pack really is done, the rebuilt-pack shops are usually the sensible choice on an older car.

Vehicle focus: Honda Civic Hybrid, 2003-2011 (the 2012 IMA failure in the threads is included for cost comparison).

Safety / mechanic note

Loss of power steering and high-voltage parts are safety items. Verify with a mechanic.