VCLEFT and VCREAR_a130 Critical Error

[CyberNewbie]

This will be the third trip to a SC for this issue. First time I was able to continue my trip, second and now third time I was stranded as the truck would not reset. Anyone else Have these issues resolved successfully and what was the core issue causing the critical errors? I am concerned that my truck is a lemon. Truck was made May 2025 and owned since August 2025.

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[JCERRN]

Ai says basically it could be from a number of things- essentially those systems are detecting instability in their power supply and throwing the critical faults. These should be priority for service evaluation. If this is the 3rd time this has been repaired, most states consider that a lemon, check your states specific guidelines. Most of the time tesla would just prefer to buy back the vehicle than challenge lemon law cases, as those are publically recorded. You just have to ask the service manager for the buy back request to be submitted to business resolutions team.

 

[Moter3d]

Washer fluid is low

 

[CyberGus]

The Cybertruck is a rolling data center. Instead of a traditional electrical harness, there's an Etherloop data channel and various modules that manage accessories in their vicinity.

Given that the "failing" modules are on the left, this is probably an issue with a bad cable or socket, possibly even a bent pin. If there's a poor connection somewhere, it may drift between marginal and defective just from vibration.

Unfortunately, I've no idea how to diagnose this to a root cause. I suppose I'd start with pulling all the connectors on the left side to visually inspect the pins, but even that requires some significant disassembly of the interior. And if you do this yourself, they could claim that the bent pin was due to your negligence.

There should be trace/debug data logged in the computer that would help narrow it down, but that's probably beyond the skill level of a typical tech. You should ask this to be escalated to the Engineering Team. If they balk, you can remind them that a repeated and unrepaired failure is grounds for a Lemon-Law buyback (although they may prefer that, since it will get you to go away lol)

 

[RoboTaxi]

If you can I’d lemon it and never look back.

 

[CyberNewbie]

Washer fluid is low

There is always one!!!

Ai says basically it could be from a number of things- essentially those systems are detecting instability in their power supply and throwing the critical faults. These should be priority for service evaluation. If this is the 3rd time this has been repaired, most states consider that a lemon, check your states specific guidelines. Most of the time tesla would just prefer to buy back the vehicle than challenge lemon law cases, as those are publically recorded. You just have to ask the service manager for the buy back request to be submitted to business resolutions team.

Missouri requires four attempts to repair but I feel this is where we are heading.

 

[TwiztOG43]

These were the first alerts I was getting months before my PCS (Power Conversion System) was replaced.

Tesla Service center initially could not replicate it, so I picked up the truck.

weeks go by and it starts having issues again, with the rear steering. They replaced a harness under the rear floor that was supposedly linked.

Then weeks go by and start to have these critical alerts again until exiting and reentering the vehicle no longer resets the truck.

Haven’t had any issues once the PCS was replaced at the 3rd Service center visit. Took almost 2 weeks, but that was due to parts availability at the time.

 

[CyberNewbie]

The Cybertruck is a rolling data center. Instead of a traditional electrical harness, there's an Etherloop data channel and various modules that manage accessories in their vicinity.

Given that the "failing" modules are on the left, this is probably an issue with a bad cable or socket, possibly even a bent pin. If there's a poor connection somewhere, it may drift between marginal and defective just from vibration.

Unfortunately, I've no idea how to diagnose this to a root cause. I suppose I'd start with pulling all the connectors on the left side to visually inspect the pins, but even that requires some significant disassembly of the interior. And if you do this yourself, they could claim that the bent pin was due to your negligence.

There should be trace/debug data logged in the computer that would help narrow it down, but that's probably beyond the skill level of a typical tech. You should ask this to be escalated to the Engineering Team. If they balk, you can remind them that a repeated and unrepaired failure is grounds for a Lemon-Law buyback (although they may prefer that, since it will get you to go away lol)

Thank you, I will bring this up.

 

[CyberNewbie]

These were the first alerts I was getting months before my PCS (Power Conversion System) was replaced.

Tesla Service center initially could not replicate it, so I picked up the truck.

weeks go by and it starts having issues again, with the rear steering. They replaced a harness under the rear floor that was supposedly linked.

Then weeks go by and start to have these critical alerts again until exiting and reentering the vehicle no longer resets the truck.

Haven’t had any issues once the PCS was replaced at the 3rd Service center visit. Took almost 2 weeks, but that was due to parts availability at the time.

I am curious if it is the PCS and will definitely bring this up. i love the truck but getting stranded by the side of the road is no bueno!

 

[CyberNewbie]

the truck was towed in today and is at the SC. I will update with how the service is going and what is done and more importantly the success or failure of the fix. I do not want to go the lemon law/buy back route but the truck needs to be reliable! Appreciate everyone’s input so far!

 

[CyberGus]

I am curious if it is the PCS and will definitely bring this up. i love the truck but getting stranded by the side of the road is no bueno!

A PCS failure is typically very obvious, with all the appropriate alerts, but I suppose a marginal one could produce all manner of quirky side-effects.

 

[Outdoors]

I understand there is much goin on lately around the PCS. A VCLEFT alert is not usually associated with a PCS issue. Might want to separate the issue right here.

 

[JCERRN]

I understand there is much goin on lately around the PCS. A VCLEFT alert is not usually associated with a PCS issue. Might want to separate the issue right here.

In isolation, no. But in combination with the other errors, something linking all of those systems along the 48v system is causing the faults. Could potentially trace back to the PCS.

watching thread for sure

 

[CyberNewbie]

SC is saying bad wiring harness and it is ordered. I will update post repair.

 

[CyberNewbie]

Well apparently the issue is something a little more intensive. The SC brought in the Region Engineering Review Team and they are working the issue. Anyone have experience with this?

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