Peugeot Partner 2017 won’t start after disconnecting battery

[Shortland2]

Hi all,

First time poster and long time lurker…so hi to everyone and thanks in advance for any help I receive.

I have a 2017 (66 plate) Peugeot Partner van.

I stupidly disconnected the battery without following the correct procedure (which I didn’t know about at the time).

After reconnecting the battery, my van won’t start. I’ve tried the BSI reset multiple times with no success.

My windows are stuck up as I’m unable to get them down, so In order to trick the van into thinking the door is shut I have flicked the latch with a screwdriver. So as far as I’m aware I’ve followed the BSI procedure exactly as I should.

When I try to start the van the battery light flashes on the dash and the screen states ‘economy mode’. I try to turn the van on and I get NOTHING.

Any suggestions as to what may be my issue or how I can troubleshoot this please?

[HelioMV]

I have had similar but limited experience but slightly older (delete this if unhelpful admin), so I'd say start afresh after leaving it this evening and go with:

- Check battery voltage, connections and grounds, note some grounds could be in a less obvious place (I know it was ok before but still)
- maybe give it a charge/jump, maybe it can't deliver the current but shows ok nominal volts when unloaded?
- Check all connectors to critical electronics where possible
- Check fuses - specifically ECU, BSI, ignition and cluster (although we'll assume that's alive), diag port and any critical maxi fuses
- Any immobiliser light or indication of that? Not sure if it's a no-turn thing or a no-start thing but maybe another key if one to hand?
- If you can with ignition on scan for any codes. No comms ones are usually a good pointer, if its an auto (I assume not) gearbox comms loss could be an issue as it doesn't know gear selected?

Unsure about trying to manually engage starter or anything yet, just try all the basic stuff and see. I assume a parameter that should have been written is not or something stupid like that.

[Shortland2]

I have had similar but limited experience but slightly older (delete this if unhelpful admin), so I'd say start afresh after leaving it this evening and go with:

- Check battery voltage, connections and grounds, note some grounds could be in a less obvious place (I know it was ok before but still)
- maybe give it a charge/jump, maybe it can't deliver the current but shows ok nominal volts when unloaded?
- Check all connectors to critical electronics where possible
- Check fuses - specifically ECU, BSI, ignition and cluster (although we'll assume that's alive), diag port and any critical maxi fuses
- Any immobiliser light or indication of that? Not sure if it's a no-turn thing or a no-start thing but maybe another key if one to hand?
- If you can with ignition on scan for any codes. No comms ones are usually a good pointer, if its an auto (I assume not) gearbox comms loss could be an issue as it doesn't know gear selected?

Unsure about trying to manually engage starter or anything yet, just try all the basic stuff and see. I assume a parameter that should have been written is not or something stupid like that.

Hi, thanks for your reply!

- I'll check the battery voltage later and any obvious grounds that I can see. Although as you said it was working fine and no issues until I disconnected it so that would be strange.
- I did try and jump start it as this was my first thought and that made no difference.
- I'll go round and check all of the fuses to see if any are blown and replace as needed and hopefully something will jump out at me.
- No immobiliser fault as far as I can see, the alarm doesn't go off and the key locks/unlocks as it should - so assume that means the key is still registering with the vehicle? I don't have a spare!
- I've put in a standard OBD reader but it's failing to scan every time, where as it used to work no problem. I'm not sure if this points to any errors and could be linked to the no start issue? I'm tempted to purchase a proper Lexia reader to get a better idea but wanting to avoid paying for that at first if this is something simple.

I was wondering if manually engaging the starter motor might be an option and whether that might kick start everything. Although this isn't something I've done before, so would need some guidance.

[HelioMV]

Yes check fuses, test light and meter sounds useful!

Sounds like immo it is not at fault. It sounds like there's an ECU or BSI loss of communications due to power fault, or maybe comms have stopped due to a condition sent by one of the computers locking it up. Activate a load of BSI and ECU related stuff, any buttons you can find!

Have you checked all relays too, like starter one? Could bridge/swap it if tempted with identical one or you can test with bench PSU (safer). Relay 8 I think. Check ignition barrel actually registers start position too.

Unsure if economy mode would stop CAN comms for scanning, but the fact that it isn't is strange. Does the dash all light up correctly?

[HelioMV]

Closest Lexia/Diagbox could be good to read any awake devices yes, sounds like the BSI is working somewhat!

Mine was 100 quid and never looked back. V useful for any long time peugeot/citroen owner long term

[HelioMV]

Also if you have one of those battery mounted management systems, make sure its enabled by seeing if theres voltage on the big metal piece on top (leading to fusible links) - you can jump that if its off as well

[Shortland2]

Also if you have one of those battery mounted management systems, make sure its enabled by seeing if theres voltage on the big metal piece on top (leading to fusible links) - you can jump that if its off as well

Thanks, I’ll take a look at that too. I’ve put my multimeter across the battery and it’s currently reading 10v which is extremely low.

I’m hoping that’s the issue and going to fit a new battery tomorrow. Strange as it was ok before but fingers crossed.

[HelioMV]

Ah man 10V cmon of course that won't start it! Unless you're measuring across some sort of turned off BMS!

If its still 10V or there's some high resistance you can go with electrical diagnosis

[Shortland2]

New battery is in and still nothing at all.

Is there a way to test the metal plate with fuses on that sits on top of the battery, should there be any voltage through that?

I’ve got a Peugeot code reader arriving tomorrow so I can see if it throws anything up.

Genuinely at a loss at the moment as my knowledge of how and where to test things are limited

[Shortland2]

Have tested all fuses and they’re ok. One thing to mention is that when I used to put my standard OBD reader into the car, it was often throw up loads of codes and the van would throw a bit of a wobbly on me with all sorts of faults showing. I’d then turn the van off and on and they’d all disappear. Only did this a couple of times.

So don’t know if there is a dodgy connection somewhere or if that could be related but thought I’d mention it just in case

[HelioMV]

New battery is in and still nothing at all.

Is there a way to test the metal plate with fuses on that sits on top of the battery, should there be any voltage through that?



I’ve got a Peugeot code reader arriving tomorrow so I can see if it throws anything up.

Genuinely at a loss at the moment as my knowledge of how and where to test things are limited

Sorry for late reply, issues of my own!

There should be battery voltage at each of those fusible links on the metal board if that system is behaving properly. Continuity each one of them as well

[Shortland2]

New battery is in and still nothing at all.

Is there a way to test the metal plate with fuses on that sits on top of the battery, should there be any voltage through that?



I’ve got a Peugeot code reader arriving tomorrow so I can see if it throws anything up.

Genuinely at a loss at the moment as my knowledge of how and where to test things are limited

Sorry for late reply, issues of my own!

There should be battery voltage at each of those fusible links on the metal board if that system is behaving properly. Continuity each one of them as well

No problem!

I've managed to fix it in the end. First time round I only visually inspected all of the fuses in the engine bay compartment.

After no luck I used my multimetre on each fuse and found the culprit.

Fuse 1, in the engine bay, had some corrosion on it and had blown. This controls the engine management and once replaced the van started right up.

[wheeler]

Unsure if economy mode would stop CAN comms for scanning, but the fact that it isn't is strange. Does the dash all light up correctly?

No, Eco mode should not stop comms, if it did you wouldn't be able to do any fault finding in a non start situation most of the time.

Good luck with the Euro Crap Parts Lion brand battery, if it lasts more than 6 months buy a lottery ticket

[ozfrog]

I've managed to fix it in the end. First time round I only visually inspected all of the fuses in the engine bay compartment.

After no luck I used my multimetre on each fuse and found the culprit.

Fuse 1, in the engine bay, had some corrosion on it and had blown. This controls the engine management and once replaced the van started right up.

I know I'm late to this, and I'm glad you got this solved.

My first thought when I read the problem was of my wife's 2011 3008 2.0 HDi and the issues it had after I took the car to get the battery replaced. We live 40 minutes drive each way out of town and I had things to do at home that morning, but the 3008 was giving my wife some electrical troubles so we decided to get the battery replaced. Forty minutes each way driving plus 30 minutes for a battery changeover should not equal 4 days of lost time, but it did.

No corrosion on Fuse 1, but the same fuse that controls the Engine Management System had blown. The battery people should have known to check the correct shut down procedure for a Peugeot. They just disconnected the battery as soon as I drove in. I don't know how many different scan tools and brands of scan tool were used to try and locate the problem, but all failed to find anything. Thankfully, the Peugeot dealership was across the road, but we still had to get the car put on a flat tow and taken there. They found the problem immediately, but they also had 3 or 4 cars in front of us. They're a mult-brand dealership with only one Peugeot trained 'technician' so we had to wait our turn.

All very simple, but only when you know how.