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I have a 2004 Toyota Sienna. The VSC, TRAC OFF, washer

Customer Question
fluid, and Check Engine light...
I have a 2004 Toyota Sienna. The VSC, TRAC OFF, washer fluid, and Check Engine light are on. The engine codes are:
P2769 Acc Solenoid Circuit low, and
P0403 Catalyst System Effeciency below threshold Bank 2.
What do you suggest I do?
Submitted: 2 months ago.Category: Toyota
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Customer reply replied 2 months ago
We purchased this vehicle new. Has always had a hard low shift. Was told that a computer program would fix problem. Now program produced. Shift is harder now, with engine code. If we warm up the vehicle before driving it is better. We have also replaced the transmission filter and fluid. Shift improved for a time.
Answered in 12 minutes by:
12/19/2017
Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago
Jared D
Jared D, ASE Certified Technician
Category: Toyota
Satisfied Customers: 2,096
Experience: Shop Supervisor at County Fleet
Verified

Good afternoon,

Unfortunately the p0403 indicates a bad catalytic converter. The only solution is a cat replacement.

For the other code you might look at checking the electrical connections to the torque converter clutch before anything else. This code can set for the following reasons:

  • Shift solenoid DSL connector is damaged (check pins for damage, moisture)
  • Shift solenoid DSL has failed (electrical fault)
  • Shift solenoid DSL control circuit is shorted to ground
  • PCM has failed
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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago

I would see if you or a shop can trace the wiring from the shift solenoid DSL connector to the PCM to make sure the wire isn't rubbed through, pinched, or melted anywhere. A test for resistance to ground will tell right away.

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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago

If the wire isn't shorted to ground anywhere then the next thing I would do is inspect/replace the shift solenoid valves.

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Customer reply replied 2 months ago
Can I try a Car cleaner first. Are these added to the gasoline? These codes came on after replacing the transmission filter and fluid. Within a few days.
How can I check wiring myself?
Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago

For the cat, I've never found a cat cleaner product that actually works. They are out there, and some have money back guarantees, but I can't say any of them work at all.

If the code set after the filter replacement then I would suspect the connector at the transmission is loose or damaged, or a wire got pinched/damaged inside the transmission pan when replacing the filter. I would pull the pan and look for damage to the wires.

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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago

I hate to answer and run, but I'm leaving the shop for the day. I'll check in with you later to see how things are going.

Best bet, pull the pan and see how things look.

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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 months ago

Please let me know if you need additional info.

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