2015 LR4 Stalling when cold - Low Fuel Pressure Fuel codes etc.

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SMorelli

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I have written this hoping it helps others to save some money!

I have a 2015 LR4. It started to stall at low revs predominantly in the cold weather and within 10 mins of the first start of the day. Always as I tried to pull away at a junction or traffic lights.

It threw mainly low fuel pressure codes and the display would often switch to the al terrain page. It always re-started and usually ran all day with no issue.

I looked at everything obvious including the fuel relay (it was clicking in & out) in the fuse board to avoid spending $$$.

The first summer the problem disappeared and reappeared in winter. Once started and stalled it seemed like it would run no problem all day and never stalled at speed.

The following summer it continued to stall with increasing frequency. I had a code for O2 sensors and they were due so changed them. This did not fix the issue.

I put it into a specialist in Jan 2023 (very cold at this time of year in Canada) he said it runs fine and wanted to buy it from me. ($500 for driving it back and for to work for 3 weeks!!!!) It stalled two days later and continued to do so including not even starting until the weather got above -10DEGC.

Frustrated I put it into a garage that I trust and had him change Low pressure fuel pump, low pressure sensor, low pressure pump controller & High pressure/temp sensor.

Still it stalled!!!!!!!!

I changed the fuel cap in case the tank was Vacuuming........still stalled!!

I went back to the workshop manual and reviewed the low-pressure system and the only part I had not replaced was the fuel relay but I could still hear it clicking in and out.

A little further research on relays and I found a source that said never trust that just because its energizing that its good.

I removed the relay and energized it with a 12 battery and measured the resistance across the contacts. Each time i energized it the resistace jumped from 0 Ohms (good) to sometimes 600 Ohms (bad).

Bingo!!!!!! the intermittent failure was dirty/bad contacts on the relay that feeds the low pressure fuel pump controller.

I opened up the relay and confirmed this was the issue and even cleaned them with brake cleaner. I then swapped the relay with the same on that feed the blower to test my findings and the problem vanished.

I bought two new relays from LR $35ea and now have my car running like a watch!!

I learned the hard way, I hope this helps you guys. Just swap the relays to test yours, no big deal if the blower doesn't work if it proves the issue.
 

16LR4Landmark

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Hello SMorelli. Would you mind sharing a pic of the location of the relay. I have an intermittent issue with my 16LR4
 

4x4swamp

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I have written this hoping it helps others to save some money!

I have a 2015 LR4. It started to stall at low revs predominantly in the cold weather and within 10 mins of the first start of the day. Always as I tried to pull away at a junction or traffic lights.

It threw mainly low fuel pressure codes and the display would often switch to the al terrain page. It always re-started and usually ran all day with no issue.

I looked at everything obvious including the fuel relay (it was clicking in & out) in the fuse board to avoid spending $$$.

The first summer the problem disappeared and reappeared in winter. Once started and stalled it seemed like it would run no problem all day and never stalled at speed.

The following summer it continued to stall with increasing frequency. I had a code for O2 sensors and they were due so changed them. This did not fix the issue.

I put it into a specialist in Jan 2023 (very cold at this time of year in Canada) he said it runs fine and wanted to buy it from me. ($500 for driving it back and for to work for 3 weeks!!!!) It stalled two days later and continued to do so including not even starting until the weather got above -10DEGC.

Frustrated I put it into a garage that I trust and had him change Low pressure fuel pump, low pressure sensor, low pressure pump controller & High pressure/temp sensor.

Still it stalled!!!!!!!!

I changed the fuel cap in case the tank was Vacuuming........still stalled!!

I went back to the workshop manual and reviewed the low-pressure system and the only part I had not replaced was the fuel relay but I could still hear it clicking in and out.

A little further research on relays and I found a source that said never trust that just because its energizing that its good.

I removed the relay and energized it with a 12 battery and measured the resistance across the contacts. Each time i energized it the resistace jumped from 0 Ohms (good) to sometimes 600 Ohms (bad).

Bingo!!!!!! the intermittent failure was dirty/bad contacts on the relay that feeds the low pressure fuel pump controller.

I opened up the relay and confirmed this was the issue and even cleaned them with brake cleaner. I then swapped the relay with the same on that feed the blower to test my findings and the problem vanished.

I bought two new relays from LR $35ea and now have my car running like a watch!!

I learned the hard way, I hope this helps you guys. Just swap the relays to test yours, no big deal if the blower doesn't work if it proves the issue.

@SMorelli - I've always stored and started my LR4 from within my heated Garage. This morning my 2015 LR4 would not crank up, and it was the first time I left her outside in the cold overnight. After finally getting the engine going, I had the vehicle stall on me while reversing into a parking spot. And the following error codes shot off: P025C, P064A, and P0087. Do you think your solution might solve my problem?? It really sounds similar.

@Tbh1981 - I know you recently dealt with a similar issue. What say you? :)

Thanks!

- E
 

SMorelli

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Sorry for the delay responding.

It sounds very very similar.

If you’re technically minded just pull the relay for the fuel pump and test it with a 12v battery or jumper pack and make sure you have zero ohms across the contacts..

Alternatively it’s the same relay as your A/C just swap them and see if the starting issue gies away.

The relay is the cheapest part of your fuel system $35 cdn.

Good luck and let us know if this works.
 
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SMorelli

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Hello SMorelli. Would you mind sharing a pic of the location of the relay. I have an intermittent issue with my 16LR4
1701441189075.jpeg
 

SMorelli

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The relay is in the long narrow fuse box next to the battery. I believe it is R8 for the fuel pump controller. Is is the same type of relay as the AC relay so if you swap them you can prove if that’s your issue.
The lid of the fuse box is labeled so easy to follow.
Let us know if this was your issue!
 

SMorelli

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Problem 100% resolved. Just did this winter with car parked outside with no starting or stalling issues!!
 

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