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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Mon Jan 11, 2021 11:26 pm 
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Joined: Thu Nov 02, 2017 8:57 pm
Posts: 50
Location: Salisbury, NC
dstjohn99 wrote:
Anyhow, the issue is reported as code TMCD0013, battery coolant malfunction - needs further diagnosis from the batter coolant heater to ECU; unable to reset the light.

Does anyone have any knowledge of or experience with this code TMCD0013?



The code is actually "THC_d0013 Battery Coolant Heater Malfunction"

The first step in diagnostics listed in the service manual is to check your 12V battery, as this error code can be improperly set by a drop in the 12V battery voltage. Batteries more than 3 years old are often suspect.

Beyond that, it's either a problem in the wiring harness (which is what your dealer was proposing to check next), a problem with the thermal controller (located in the right rear cargo area, and rarely at fault), or a malfunctioning battery coolant heater (most likely culprit, after the wiring and 12V system has been ruled out).


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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Thu Jan 28, 2021 8:35 pm 
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Joined: Wed Aug 13, 2014 8:30 pm
Posts: 286
Location: San Diego Co
hokiematt wrote:

The first step in diagnostics listed in the service manual is to check your 12V battery, as this error code can be improperly set by a drop in the 12V battery voltage. Batteries more than 3 years old are often suspect.

Beyond that, it's either a problem in the wiring harness (which is what your dealer was proposing to check next), a problem with the thermal controller (located in the right rear cargo area, and rarely at fault), or a malfunctioning battery coolant heater (most likely culprit, after the wiring and 12V system has been ruled out).


It definitely started with a 12V issue, I had extremely strange behavior one day with flickering cabin lights and several diagnostic errors. My first stop was the 12V battery. I had some corrosion on the terminals so I checked the battery and cleaned the terminals. Everything worked fine after that, but I am surprised that the code will not reset. Perhaps the 12V caused another problem that now needs repair.

I appreciate the feedback. I will trace down the items on the list you provided and see what I can find. Thank you.

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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Sat Jan 30, 2021 4:57 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4125
Location: San Diego county, California USA
The dealer has to reset a simple 12 volt battery error code.

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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Wed Feb 03, 2021 12:43 am 
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Joined: Wed Sep 04, 2013 12:13 am
Posts: 39
Location: Trabuco Canyon, CA
I am taking my RAV back to Carlsbad Toyota tomorrow to fix the remaining issue with the cruise control. The new drive unit has been perfect so far otherwise.
They left the JdeMO in non-functional condition last time, so I may need to swing by QC Charge on my way back whenever it gets done to have it reconnected :|

Update: Tesla diagnosed issue as Gateway computer. They should have another one tomorrow and will replace the existing. We will see how that goes.

Update 2: The computer replacement did not fix the issue. Diagnosis ongoing.

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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Tue Feb 09, 2021 5:33 pm 
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Joined: Thu Nov 02, 2017 8:57 pm
Posts: 50
Location: Salisbury, NC
Syrinx wrote:
Update: Tesla diagnosed issue as Gateway computer. They should have another one tomorrow and will replace the existing. We will see how that goes.

Update 2: The computer replacement did not fix the issue. Diagnosis ongoing.


This particular fault code is broadcast by the thermal controller; there's no good reason to have suspected the gateway.

The dealership should be able to perform the simple wiring checks (measuring resistances) as outlined in the factory service manual. After that, the most likely culprit is a failed heater, or less likely a bad thermal controller.


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 Post subject: Re: Preferred Dealers for Repairs / Warranty
PostPosted: Tue Feb 09, 2021 8:00 pm 
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Joined: Wed Sep 04, 2013 12:13 am
Posts: 39
Location: Trabuco Canyon, CA
They should ask you and not Tesla next time, because Tesla's response is that they should replace the drive unit again. What's funny is the service rep said they were going to use a "new" one instead of a rebuild. Everything I have heard on this forum says those do not exist. I have no idea when I will see my RAV again. :roll:

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