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thebesthonda, ASE MasterTechnician
Category: Honda
Satisfied Customers: 3084
Experience:  26 years experience
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I have a 2003 Honda Odyssey, I have the TCS light on while

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I have a 2003 Honda Odyssey, I have the TCS light on while driving, and also misfiring codes, of course, with the MIL light on also. I've changed all the abs wheel speed sensors on each wheel, still, TCS light on, I also noticed the transmission shifts rather normal when accelerating up to speed, but when decelerating, or coming to a stop, the trans shifts as if I was "manually" downshifting, or rather rough shifting. Also, I did notice out of PRNDD321, the selection of gear positions on the dash board for the trans, while driving, sometimes, I see the D light go dim, then back to full ilumination. Could it be a faulty transmission range switch that's causing all this? please get back to me-Thank You!
Submitted: 8 years ago.
Category: Honda
Expert:  thebesthonda replied 8 years ago.
Hello. What code is showing for the check engine light?
Customer: replied 8 years ago.
P1399,P0300,P0301,P0302,P0304,P0305,P0306. Also, for your information, I just flushed the trans, refilled with synthetic oil, A tech just did a head gasket job, spark plugs, all coils changed. He also did a leak down test, results, between 5-10%
Expert:  thebesthonda replied 8 years ago.

Ok, thanks. We need to get these misfire codes fixed first as they will trigger the TCS light. The most common cause of multiple misfire codes are


1. Clogged egr ports

2. mis adjusted valve clearance


On a side note, I would recommend removing the synthetic fluid from the trans. Honda recommends only Honda ATF-Z1. I have seen aftermarket fluid cause problems in Honda tranny's.

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