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Gearbox Fault Detected (and some grinding sounds)

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#41 ·
rcomeau said:
Had a funny (not in a good way) thing happen today. As I pulled into a parking space, I heard a second of rubbing/grinding-like sound. I was turning tight, so I thought the tire might be rubbing on something so I did not give it another thought (others than noted a new, strange sound).

When I left work, I started getting intermittent "Gearbox Fault Detected" messages. They were yellow, would appear for 2 seconds then disappear. Seemed to happen when accelerating from stop. The grinding sound (more like a creaking/rubbing) happened again a few times and once, the car lurched to a stop when I tried to move from a stop sign (felt I got rear-ended).
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Unfortunately I started seen this exact behavior. Am I lucky to have this issue now if it is the wiring harness replaced under warranty ? I don't know why there is a recall for this issue, not not in NoAm. I guess Decaries Motors knows what to do now with it, and the diagnostic and repair won't take too long.
My first "issue" since a long time. Still love the car !
 
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#43 ·
Not at the moment, the error message just "flashes" in the dashboard (on then off after 1 or 2 sec), and I hear that noise when I decelerate at low speed (sometimes) or when I turn left or right, at low speed, coming from a stop (sometimes).

What kind of fix was it ?
 
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#44 ·
MUCH worse than expected. Update to my post #40. Disappointed nobody asked, but happy to share:
Went into Cole European armed with TSB printout for Wiring harness defect. During their diagnostics, they discovered metal in the motor fluid sample, so my car is getting a NEW FRONT MOTOR ($8k retail) as a result, with 25-30 hours labor guessed. Of course, wiring harness also will be replaced at the same time, saves a few hours for that when done with motor.Luckily a motor and wiring harness were nearby in N.CA so maybe total time is under 2 weeks.

Cole technicians had experience with Gearbox Fault and dug way deeper than I asked or imagined necessary. I don't understand all the connections with the parking brake engaging and motor operation. My car slammed on the parking brake only twice at 2-3 mph just before I drove it to the shop (tow would've been safer) so unclear if just that created metal in the oil / fluid. No grinding detected while driving. A few times over a year I had felt a bit of initial jerking acceleration under hard acceleration from standing, but no other clues motor had problems.
 
#45 ·
Update from the dealer : Wiring harness seems to be the issue. No ETA for repair yet. Why don't we have a massive recall in NoAm for this ?
At least , it will be repaired under warranty.
 
#46 ·
I don't understand why they didn't make a short adapter to plug in and take the stress off the harness. Do a recall for that and it would be a quicker, cheaper fix for everyone.
 
#49 ·
I've seen it done on other vehicles, but it has been a while. Example: A Jeep I had decades ago had issues with wiring to its distributor where it was unsupported and just an "exact" in length to reach. This would cause breaks internal to the wires (you wouldn't see it just by looking at it) that messed with timing signals for the electronic control unit. Jeep issued a TSB. Adapter wiring and supporting fixed it. That Jeep almost went up in flames too for "exact" length wiring to the headlight switch. Too much stress, pulling, and increased resistance there melted the connector causing smoke and loss of external lighting. Fortunately, that's as far as it got before I pulled it apart.

It might depend on what the voltage or amperage going through the wires at the problem connector. I haven't looked it up in the wiring diagrams (yet). If any one wire handles high voltage or current, then I can understand the preference for replacing the whole harness.
 
#50 ·
Update: Jaguar called me on Monday to validate that it was a wiring harness, and they had to order the part. Today they called me to say that they have received the part, installed it, and did a test drive. They even checked for a leak in HVAC, found one, and fixed the issue. I did not know that I have this issue, but glad to see that they were pro-active here. 3 days to identify the wiring harness issue, order the part, receive it, and fix it. No complain at all, here. My dealer is absolutely great !
 
#51 ·
Now my I-Pace has run into the same "Gearbox fault detected" problem, but the message was showing only when slowing down. At one point the wheels have locked and the car stopped abruptly, but then I was able to resume driving.

I dropped it off last Wednesday. It's been 5 days (albeit the January 1 holiday was one of them) and so far they troubleshot the issue, found the cause (short in wiring harness), and ordered the parts. Supposedly will be ready in about a week from now and no loaner is available for me at this time but was promised one within a few days.
 
#56 ·
Got an update from SC.
They've replaced aux 12v battery, and most symptoms are gone.
Now waiting for the "driver side steering switch block" (?)
Asked about harness replacement - the service advisor wasn't sure. Am I getting it right, that it's a mandatory fix as per NHTSA requirement ?
 
#57 ·
Wiring harness is a replacement if they find broken wires. NHTSA has not requested them to do a recall although I understand a recall was performed in the UK.

Reads like one of the switch assemblies on the steering wheel was found to be faulty too. Possibly the one with the thumb wheel given the wording of "driver side".
 
#59 ·
#60 ·
Alright, confirming Aux 12V battery and steering column headlights switch.
Just picked up, runs fine so far.

But somebody has to explain to me - why 12V battery is such a critical component here, if you have a huge traction battery which can keep 12V charged all the time no matter what ? Per my understanding, 12V battery is only needed as a buffer capacity, while all power to the low voltage rail can still come from the traction battery through a voltage converter.
Looks like an architectural issue IMO.
 
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