Why won't my highlander shift in to 4th gear?

Asked by Mar 28, 2015 at 08:13 AM about the 2007 Toyota Highlander Base AWD

Question type: Maintenance & Repair

The highlander won't shift to 4th gear at high speed. No lights show on dash but P0606
and P0138 codes show when car is scanned

5 Answers

37,625

PO138-- Faulty Rear Heated Oxygen Sensor Bank 1 - Rear Heated Oxygen Sensor Bank 1 harness is open or shorted - Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection - Intake air leaks - Exhaust gas leaks - Inappropriate fuel pressure - Faulty fuel injectors Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem. PO606- Faulty Engine Control Module (ECM) - Engine Control Module (ECM) Harness power supply circuit is open or shorted - Engine Control Module (ECM) Programming Check the ECM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the ECM.

1 out of 1 people think this is helpful.
37,625

Long story short, replace Rear O2 sensor on bank I and try to clear the PO606 code. If it won't clear, you will either have to reprogram the ECU or replace it. But check the ECU fuse first. The ECU issue may be your shifting issue also.

1 out of 1 people think this is helpful.
Best Answer

Thanks Reelin68. Do you think replacing O2 sensor combined with either clearing P0606 code or reprogramming ECU can eliminate shifting issue? I am really hoping I don't have to replace the unit. I heard it can cost a couple thousand dollars!! Can a used unit suffice if that is required?

37,625

Not sure if that will cure your shift issue. It may. If code persists, you will have to try reprogramming it or getting another. I would try Ebay or local salvage yard. Or you can remove your ECU and send it to these guys and they send you back a fresh rebuild for $189. SIA Electronics Toyota ECM ECU PCM Toyota Engine Computer Repair & Return SIA Electronics has many other repair services available. (800)737-0915 This listing is a REPAIR for your Toyota ECM/ECU/PCM. All Models and Years.

1 out of 1 people think this is helpful.

No, replacing O2 sensor will not help the shift issue. It will repair a fuel trim issue.In return give you a negligible gas milage and power gain should you decide to repair the transmission. There is a low probability that the shift solenoid will repair it. More than likely the $3500 boat anchor attached to your engine needs to be rebuilt, or replaced.

Your Answer

Add photo

Related Questions

  • How to get my 2002 highlander out of gear manually 1 answer

    Highlander won't come out of gear

    2002 Toyota Highlander

    -

    Maintenance & Repair

  • 2002 Highlander will not shift into park 8 answers

    My wife's 2002 Highlander will not shift into Park. It will go through every gear except Park. Any ideas on what the problem and fix is? Thank You

    2002 Toyota Highlander Limited V6 4WD

    -

    Maintenance & Repair

  • VSC and TRAC OFF lights on 1 answer

    The above mentioned lights are on and it won't allow me to shift out of park. Any suggestions on how I can get my 2006 Highlander rolling long enough to get it to the dealership?

    2006 Toyota Highlander Base V6

    -

    Maintenance & Repair

  • 2002 highlander. V6 limited Xmission lock up. 1 answer

    what is cause & Repair if Xmission locks up in Park?? Unable to shift into drive gears. This has been happening intermintly . Don't wish to have it hang up somewhere out in the middle of nowh...

    Toyota Highlander

    -

    Maintenance & Repair

  • my 1991 Toyota corolla wagon pops out of 4th gear 1 answer

    while driving, the car pops out of 4th gear.....if I try to hold it in to 4th gear, it begins to make a grinding sound....no problem going from 3rd to 5th gear, and it doesn't pop out of any other g...

    1991 Toyota Corolla DX Wagon

    -

    Maintenance & Repair

Highlander

Looking for a Used Highlander in your area?

CarGurus has 25,848 nationwide Highlander listings starting at $2,900.

ZIP:

Search Toyota Highlander Questions

Toyota Highlander Experts

#1 Wendy Tucker
Wendy Tucker
Reputation 4,030
#2 Tom Demyan
Tom Demyan
Reputation 3,780
#3 Shawntele Lewis
Shawntele Lewis
Reputation 2,410
View All

Related Models For Sale

Used Honda Pilot
349 Great Deals out of 21,187 listings starting at $2,199
Used Toyota 4Runner
277 Great Deals out of 20,895 listings starting at $1,995
Used Toyota RAV4
643 Great Deals out of 70,828 listings starting at $2,350
Used Acura MDX
220 Great Deals out of 18,750 listings starting at $1,495
Used Toyota Highlander Hybrid
25 Great Deals out of 2,150 listings starting at $4,291
Used Nissan Pathfinder
277 Great Deals out of 22,291 listings starting at $2,250
Used Toyota Sienna
224 Great Deals out of 30,039 listings starting at $1,995
Used Toyota Camry
845 Great Deals out of 90,969 listings starting at $850
Used Honda CR-V
823 Great Deals out of 60,379 listings starting at $900
Used Ford Explorer
833 Great Deals out of 75,041 listings starting at $1,200
Used Lexus RX 350
406 Great Deals out of 20,913 listings starting at $5,900
Used GMC Acadia
504 Great Deals out of 47,095 listings starting at $4,995
Used Jeep Grand Cherokee
1,041 Great Deals out of 74,230 listings starting at $950
Used Toyota Sequoia
143 Great Deals out of 5,759 listings starting at $2,195
Used Toyota Tacoma
501 Great Deals out of 39,894 listings starting at $1,995

Used Cars For Sale

2017 Toyota Highlander For Sale
4 Great Deals out of 14,657 listings starting at $27,729
2016 Toyota Highlander For Sale
22 Great Deals out of 1,236 listings starting at $23,985
2015 Toyota Highlander For Sale
44 Great Deals out of 1,777 listings starting at $20,435
2014 Toyota Highlander For Sale
27 Great Deals out of 1,321 listings starting at $18,398
2013 Toyota Highlander For Sale
71 Great Deals out of 1,534 listings starting at $12,995