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Discussion Starter · #1 ·
After 22 months of excellent motoring in my early MY20 I-Pace I’ve just experienced my first serious fault with the car. However, I remain a great fan, because the route to resolution was fairly fast and successful. All credit to Jaguar Assist and this Forum, but not my dealer.

Last Friday, car fully charged and preconditioned for an important (due to severe family illness) 130 mile journey, a yellow warning light came on when I started the motors, the message read “OK to drive with caution Brake pedal feel reduced Press OK to clear” I cleared the warning and set off. En-route I called my dealer to ask for advice and the car was duly booked in for further investigation the following Friday. My return journey was later completed with no change to warning and the brakes felt fine.

Friday night at home I searched this forum on “brake pedal feel reduced” and read the results with a sinking feeling… Sounds like the 12V battery issue some have experienced.

Saturday, I need to visit my family in hospital. I decide not to take the I-Pace but journeyed in my old XK. I am very glad I did so, because…

Sunday the I-Pace which had been charged overnight to 85% was started to nip to the newsagents. Same brake pedal soft warning comes up, but now two more: “OK to drive with caution Emergency Brake Assist not available” and “ASPC not available”. Brakes now feel rock hard, like there’s no servo assist (which is in fact the case). I’ve had this happen on 2 other cars in the past while driving, so whilst not fazed, I determine the car is unsafe to drive and press the yellow Jaguar Assist button.

Jaguar Assist impress me, the call is answered promptly, my details and the issue are confirmed I’m told someone will be with me 1½ to 2 hours later. Texts keep me updated and after 1½ hours the van with a young technician arrives.

The technician smiles in recognition when I describe the issue and I ask if he’s seen this before? Yes, he says and explains what the problem is. He is pretty confident he can get me going again within the hour. He then shows me the two 12V batteries in the front-boot, the smaller of which (on later models I believe there’s only one battery) is purely to run the vacuum pump for the brakes, he checks the voltage and its 7.3V. Upon shorting the positive terminal of the larger battery to the smaller one the brakes instantly come back to life and he then connects jump leads from his van to charge both batteries while he works on the actual culprit, the software.

A laptop is connected and key modules linked to the inverter and low voltage battery charging are in need of a firmware upgrade he informs. Specifically: EPICB, EPICC and EPICD5 are updated.

Car is rebooted twice, faults cleared and car is back to good health. Interestingly the GOM range goes up by ~15 miles, but I think this is temporary.

Car now performing as expected and back to normal.

Lessons learned (for me):
  1. Dealers need to be updated and educated on certain faults, that are likely to quickly deteriorate, so they can advise clients better. Also, the policy of only doing updates when the car breaks has to be questioned, in the digital world we update all the time to ensure known faults/bugs are corrected for the majority before they have impact. I have written to JLR Customer Services.
  2. This forum saved me from an issue arising mid-journey on Saturday, which could have been most inconvenient. Many thanks!
  3. Jaguar Assist have specialists who know their stuff (sample of one I admit) and will definitely be my preferred “go-to” source when future problems occur.
Apologies for the rather long post, but I thought I’d share the story. If you get the same warning don’t drive too far before getting your car checked.

I personally remain impressed with car, it is a terrific drive and Jaguar’s service, which while patchy, does deliver (particularly Jaguar Assistance).
 

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Thanks for sharing…. I have this message occasionally but always clears with a stop and restart.
I will get them to look.
 
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Many thanks RobN for this post; I've had very similar probs & have got the AA (JLR) mechanic arriving tomorrow. Useful to have yr experience; it does indeed look like a software error and, as you say, makes one wonder why this couldn't have been fixed up front for all by a routine s/w update.
 

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Discussion Starter · #4 ·
Glad to be of some help.

@Stephen I hope you're fault is as quickly resolved as mine was.

Best, Rob
 

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Many tnx Rob - 19.11.21 10.00-11.00 JLR technician attended via AA call out. Following three modules updated: Body Control; Gateway Access; Powertrain Control. Jump leads used to charge the auxiliary battery with further jumper to 2nd auxiliary battery. Car now working normally but the technician pointed out that there was an outstanding campaign on this car which needed implementation: H288 Park Pawl Actuator. This is a job for a JLR garage; so have booked accordingly.
 
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