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Honda Civic Hybrid IMA Problems

185 messages,  Last post on Dec 03, 2009 at 2:36 PM

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#153 of 185 Re: update [mrlar] by Ogre_GEV Oct 02, 2009 (6:14 am)
Replying to: mrlar (Sep 29, 2009 2:21 pm) >By the way, does anyone know what the "P0A7F" is? Is that the firmware update?   Per the reference manuals that I have, P0A7F which is a "soft" DTC (it will not light the CEL or IMA) means that the battery capacity has deteriorated to less than 10% of the original 6.5Ah. This means that while it is capable of producing as much current and driving the motor as strongly, it will be depleted in only 10% of the time of a new battery. As I said before, your bad luck was that all 120 cells deteriorated at the same rate and the balance was never thrown out far enough to trigger the hard DTCs.   It's important to note that this code does not automatically mean the battery is dead. If you then drive it aggressively down to "empty" and then conservatively drive it up to "full" a few times, the capacity might rise back up to 20% or even 50% or more.   The software updates that they applied address issues like this and either try to prevent the deterioration or try to make it easier to recover from it.   I know your car is not performing the way it used to, but the big question is: what kind of mileage are you getting now? Different may not mean worse (mpg-wise).
#154 of 185 Re: update [grandtotal] by Ogre_GEV Oct 02, 2009 (6:22 am)
Replying to: grandtotal (Sep 29, 2009 3:33 pm) >P0A7F means "One of the blocks in the battery pack has deteriorated: its dynamic resistance is too high".   No it doesn't. A false P0A7F might be thrown because of that, but not in this case. No IMA light was lit.   Contact me privately if you want more information on this or any other OBD code.
#155 of 185 Re: Honda Civic IMA problems [rx2man] by Ogre_GEV Oct 02, 2009 (6:29 am)
Replying to: rx2man (Oct 01, 2009 7:24 am) >The computer programing can degrade in cars Sorry, no they can't. If the programs "degrade", then the computer module will fail.   The computer patches are fixes. If problems ("bugs") are found in the software, they release a "patch" (new version of the program) to fix it. As mechanical/electrical problems are discovered in the cars, the engineers find ways of adapting the computers to solve the problems or alleviate the symptoms.   >At 80k the dealer said I needed a new trans, but erasing and reprogramming the computer fixed most of the issues. In other words, they had found work-arounds for the problems and updating the software made most of them go away.
#156 of 185 MPG by mrlar Oct 07, 2009 (9:34 pm)
Yes, with the update the car's MPG has really dropped. I see it in the real-time MPG meter as well as with each fillup, and the TRIP indicators. At least a 20% drop and that's with having to coax it like crazy way more than I had to before... and even still, a large MPG drop. So now I have a nice, "normal" Civic that's a shadow of its former self as far as the hybrid and MPG is concerned. And all the stuff I used to do for 3 years (like easily be able to get into all-electric "coast" mode on certain flat stretches of highway, or regularly get 5 bars of assist on the hybrid while driving) are no more. Now it's pretty much 100% gas except when accelerating from zero, or really pressing down on the pedal while driving.   On a side note, I rode in a Tesla today. Amazing car (though only seats two). Immediate acceleration like you wouldn't believe, like a rocket. Extremely quiet, 100% electric. No problem with its batteries (of course it costs around $120,000...)
#157 of 185 2009 HCH IMA Problem by dowjd Nov 04, 2009 (9:10 pm)
Have a 2009 HCH with 15K miles. Last week IMA light came on. Took to Honda dealer we purchased from. Got our service invoice. They updated battery ECU & ECM/PCM... whatever they are. Also has DC=5HW00 / SC=R1100 Again whatever those are. It also lists - Defectcode 5HW00.   Anyone know if our battery is screwed and Honda is shafting us? Replies to this message: shonda3 (Nov 05, 2009 4:48 am) dowjd (Nov 05, 2009 5:20 pm) nataliem (Nov 20, 2009 10:23 am) cdubya1 (Nov 20, 2009 11:49 am) rosie2006 (Nov 21, 2009 6:28 am) and 1 more...
#158 of 185 Re: 2009 HCH IMA Problem [dowjd] by shonda3 Nov 05, 2009 (4:48 am)
Replying to: dowjd (Nov 04, 2009 9:10 pm) Yes, Honda is screwing you, just as they are screwing everyone else with a HCH. When they updated your computer, they were really rigging the IMA system to preserve the battery. This lowers the performance of the car, greatly reduces the mileage, and saves them expensive replacements at your expense. The fact is they originally rigged the batteries to produce the highest mileage possible to compete with the much better Prius. This caused the batteries to wear prematurely, thus reducing the mileage. Rather than design a workable system that delivers what they promised, they are rigging the system so that it won't function optimally, but will last. I used to get between 45 and 48 MPG. They did the same to my 06 HCH and now I get 31-34 MPG. Morever, when the battery is discharged (crashed), you have all the power a standard 1.3 litre engine can deliver-- time it with a calendar. The car sucks. But the worst part is American Honda's egregious practice of denying that anything is wrong. Dump your car. Replies to this message: dowjd (Nov 05, 2009 5:20 pm) nataliem (Nov 20, 2009 10:23 am) cdubya1 (Nov 20, 2009 11:49 am) rosie2006 (Nov 21, 2009 6:28 am) nataliem (Nov 21, 2009 7:27 am)
#159 of 185 Re: 2009 HCH IMA Problem [shonda3] by dowjd Nov 05, 2009 (5:20 pm)
Replying to: shonda3 (Nov 05, 2009 4:48 am) Do you know what those codes mean?   My wife drives the car the most. Sometimes battery level would drop to 1-2 bars with AC on during summer (live in Central Valley California). Before IMA issue, on average we got 37 MPG local city/highway (with AC). We got better mileage on highway trips.. average 43 MPG at 70mph and could get 52 MPG at 55mph.   We took car to Honda 10/28/09 and they did their thing. Will know more about MPG this next fill up and battery performance.
#160 of 185 HCH Computer Programming by mdsheker Nov 09, 2009 (10:43 am)
I took my 2006 Honda Civic Hybrid into a Honda dealership this morning (11-9-2009) to get the transmission fixed, as it was leaking fluid. It is under warranty. While they had the car, I had them look into why the IMA (?) battery drains sometimes. On the average, once a week, when I'm at a stop light, and with nothing running, (e.g. no A/C, heater, radio, etc...), and when the battery bar level is at 75% full. When the signal light turns green, I take my foot off the brake pedal, and press onto the gas, and BOOM, {instantly}, the bar level drops from 75% to 0% within a half second, and while pressing onto the gas, there is NO power for me to go forward. I start to coast, and people behind me are honking for me to go, but I can't. Then after 30 seconds, I start moving again, when the battery starts to charge back up Blocking traffic for 30 seconds is bad. Anyways, Honda called me to tell me there is a software updade to FIX this. Actually, there are 3 upgrades. And, they perfomed the upgrades before getting me a quote. They CHARGED me $175 for these 3 upgrades, something that should be FREE, as it's a definate PROBLEM and bad design onto the car manufacturer's part. How much does Honda charge others for the {not-so-free} computer upgrades, that fixes something that should've been fixed already, and/or should be covered under warranty?
#162 of 185 Heat Related IMA Problems/Solutions by joek11 Jul 07, 2009 (10:02 am)
I created this tread to help diagnose give suggestions on how to eliminate this problem. Car: 2006 Honda Civic Hybrid   Problem: During periods where outside temp is 95F+ the IMA battery looses a full charge in about 10 seconds, after about 5 minutes of use. During which time the charge light goes up to 4 bars and holds steady. Coasting does not charge battery and neither does braking. After about 1 hour of run time the IMA starts working again.   Result: I went from getting 41MPG on average to around 28MPG because the IMA never functions correctly in the afternoon on the way home from work.   Possible Repairs: Took the car to Howdy Honda (Austin,TX) and they did 4 computer software updates. They also were able to replicate the problem (after the updates) and sent a snapshot of the computer diagnostic to Honda regional offices.   Outcome: Honda basically said, "This known issue and we are unable to fix it at this time. We will contact you when a fix is found."   Honda documented official diagnosis as "heat issue, not repairable at this time". Replies to this message: dowjd (Nov 09, 2009 5:26 pm)

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