Peugeot 3008 Hybrid4 12v battery drain

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Dormouse
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Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

Hi. I have been a follower of this forum for a while now and I have taken the plunge and joined up. My car, a Peugeot 3008 Hybrid4 2013, has had a problem with the service (12v) battery running down. It started 3 months ago and the faults that occurred were Air bag/pretensioner dash light came on followed by the amber engine repair required dash warning. I ran Diagbox and got various fault readings:- multiplexed additive pump, FM2 ariel fault and, surprisingly, no air bag faults. A couple of codes referred to low supply voltage. Testing the battery showed a voltage of 11.7. So, charged the battery, cleared the codes and car ran ok. Two days later, same again except this time the red Engine repair dash light came on as well. Tested the service battery - 11.2 v. Ordered a new battery as the battery fitted was the original equipment Fiamm and had the exhaust additive tank topped up as there appeared to be no mention of it in the service history - currently 98500 approx. All was well for about a fortnight then the same problems stated again. I found I could not clear the HCU2 faults which were now appearing and I could no longer get any Gearbox ECU readings. A couple of times the codes said FM2 short circuit to earth, the multilplex additive pump fault still appears and the Airbag warning code refers to the passenger deactivation switch led. The "new" battery was a generic one so I replaced with an Excide Premium - the generic battery was dropping to 12.2v and recovering to 12.4 when disconnected while the new Exide drops to 12.4 and recovers to 12.55. The battery draw is 3.4 amps at first connection dropping to around 2 amps a few minutes in. I can't find any information on the BSI cycle or its duration to data compare with. Which avenue do I try first? thanks in advance
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

something which might be of use to someone. ---- I use Diagbox on my Fiat Ducato mk111. I select Boxer and manually insert the VIN and I can interrogate/reset it. just a small tip.
lorddevereux
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by lorddevereux »

2 amps continuous draw (all systems asleep) is way too high. Mayhaps you have a short somewhere along the line?

Start by ruling out a few things - that your engine fusebox is OK and not water damaged, that the BSI looks ok and not water damaged or corroded.
Then, on the original Hybrid4 I think the battery is just charged by the DC/DC converter in the HCU. Check the battery voltage with engine running/system READY light on to make sure that it is charging correctly.

HCU1 and 2 are actually 2 boards in one unit physical unit, HCU1 doing the traction motor and HCU2 doing the on-engine generator and DC/DC. What faults were you getting on those?
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

That is exactly how I understand it and I was looking for well under 0.1 amps steady state. That 2 amps was after about 4 minutes and I didn't continue longer. The fuse box and BSI look ok with no obvious issues. Torn ligaments in my knee have stopped me investigating further for the foreseeable future, I was/am looking to investigate a FM2 short to earth code that came up a couple of times. Here are some of the HCU1 and 2 codes that came up in one report. The 12v service battery charging system appears to function as it should.
HCU2.........U12C7,U12C7,PO562,P1AEE,PO562,PO562,U1287 and from the same report, HCU1.........U1218,U1218,U1218,U1218,U1218,P1B1C,PO562,U1218,PO562,PO562,U2000,U1118,U1118,U1118,U12C6,U12C6,U12C6
SERVICE BATTERY WAS TESTED AT 11.8v at first check. I don't get exactly this code set in subsequent reports but PO562 is a common one through out all sections
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

would test driving/testing the car with the FM2 amplifier disconnected to check current draw/battery voltage cause any unintentional issues
lorddevereux
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by lorddevereux »

No disconnecting FM2 wouldn't affect anything besides the radio.

That's quite a lot of error codes...but main themes:
HCU2 - Hybrid CAN network errors, fault on 12v supply, fault on DC/DC
HCU1 - I/S can errors, fault on 12v supply, hybrid CAN errors

In particular the interesting one is
P1AEE - DC/DC transformer - Short circuit to earth

I would check the grounding of the HCU itself (a single earth screw on the casing, not sure where it goes from there on the 3008) and also the service battery.
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

12v service battery has been renewed after original equipment Fiamm showed all the signs of old age after charging and testing. Any pictures/ wiring diagrams available for the HCU unit showing earth points/ location? At first sight all of the connections appear to be in and around the removeable orange plugs but I will have a more detailed look at the harness and mountings. And I am aware it is 200v in there!
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

Could attaching an extra earthing strap to the HCU casing be a good thing anyway? It all appears fairly exposed under the car/plastic covers given it's importance.
lorddevereux
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by lorddevereux »

Image

Earth point is bottom right of this pic. Adding an additional one from here to a convenient point on the body would be no bad thing for sure! Note that this is NOT the ground for the HV battery, only the LV side for the car and control electronics!
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

I know exactly where that is. Any clear pictures of the other side. The only ones I have are from Breakers online ads and are not brilliant to look at for information. thanks ever so much.
lorddevereux
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by lorddevereux »

Lucky I have one on my office floor :-D

Image

This side is the phase connections for the traction motor + generator, the 12V DC OUT and the coolant hoses. Then I think this black connector is motor encoder etc, can't remember off the top of my head
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

thanks for PM. have tried to reply. hopefully it worked this time. Brilliant! Thanks.
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

The service battery has a christmas tree of connections off the positive lead at the outside of the casing cover- I have already checked all of them and cleaned any dirt off. Is there anything with the negative connection bar at the back of the battery I might have missed?
Dormouse
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

This is a series of screen photos of the last Diagbox session I did with the new Exide battery fitted. Anything obvious in the faults to point to battery draining and or airbag fault, engine repair fault, aerial fault.
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Dormouse
Donor 2021
Posts: 776
Joined: 15 Apr 2021, 14:32
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Re: Peugeot 3008 Hybrid4 12v battery drain

Post by Dormouse »

sorry the pictures are in reverse order. Bottom photo is the start of the report. I skipped a few bits as there was nothing to see and never has been in all the reports I have.