Rx400H Transmission Oil Pump - Error P2603 - ClubLexus - Lexus Forum Discussion


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Rx400H Transmission Oil Pump - Error P2603

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Old 07-21-17, 07:40 PM   #1
06Canuck
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Talking Rx400H Transmission Oil Pump - Error P2603

Well, this is my first post here, although I have certainly benefitted from this site already while poking around over the last year.
We managed to purchase a pristine, very well maintained 2006 with less than 100K early last year and had no real issues with it whatsoever.
I did replace the 12V battery after getting the typical codes. This time is different however...

We experienced the CHECK HYBRID SYSTEM - CHECK VSC SYSTEM lights and indicators a few weeks back, which did not produce an error code that I could retrieve with my OBDII reader.
This occurred on a rather hot day >30C and at highway speeds of 120k\h.
I cleared the codes, to see if it would hard fault -- it did not.
Last Saturday, same thing happened in the same conditions, which was a perfect opportunity to pull into the dealer (for the first time) and get the proper diags, etc.

They have come back with a long list of really high priced parts and replacement parts -- one of which will be the radiator ... covered in another post.
Of greatest concern to them is the P2603 error code which they have determined to be a suspect HV oil pump P\N 35300-48011 at a quoted price of $1413.70 CDN.
There seems to be very limited information on this, although there is some strong indication that this could just be a corroded connection (which they checked for) or
a failing relay. This still has not hard-faulted since the code was cleared last week. For some reason, I feel I may want to replace a $25 relay as a first choice.

Is this the same system as this transmission fluid change post?
https://www.clublexus.com/forums/hyb...id-change.html

Is this also the same system as this one about transmission cooler pump?
https://www.clublexus.com/forums/hyb...all-times.html

TIA -- all responses with information about the code - relay - and pump appreciated!!
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Old 07-23-17, 07:17 PM   #2
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Well, as I work through this transmission oil cooler pump issue, I figure I should document it to let you all know that I do value the forum enough to provide information for others to use.
I found the relay marked as "oil cooler" and have taken a few photos -- it is nothing special.
On this note I should mention that it has occurred to me that the transmission oil cooler pump may NEVER have been needed prior to last summer on our trip.
Considering the previous owner did not have a hitch and I was told they also traded in an Escalade that was used for towing boat and going north to the cottage when they traded in this RX400h, it is plausible that either the relay or the pump may be totally corroded...and perhaps, present some risk by coming on at some point. I added one, based on this forum recommendations and instructions - thanks for that.
Here are the pics of the relay - TOYOTA P\N 90987-02027, DENSO P\N 156700-2870.
I have ordered the relay for $30 CDN including shipping.
\

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Old 07-23-17, 10:04 PM   #3
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So it is corroded however the socket may be damaged. I would use a liberal amount of contact cleaner. It is possible the relay is ok, just need to clean contacts.
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Old 07-24-17, 07:18 PM   #4
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Default Will check internal contacts

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Originally Posted by thomas1 View Post
So it is corroded however the socket may be damaged. I would use a liberal amount of contact cleaner. It is possible the relay is ok, just need to clean contacts.
Thanks for the tip!
The socket does look somewhat corroded, for sure. Although I suspect it may be the relay contacts internally that are corroded, so I plan to pop it open after I get the new one into it tomorrow.
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Old 08-13-17, 07:09 AM   #5
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Hi!
Any success with that issue? Does the relay replacement solve the problem? Or is it anyway oil pump failure? I have same P2603 error on my 450h. Relay seems to be fine.
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