Hi, my Lexus gs300 will not crank and start after being fine when parked up the night before. The radiator fan will kick in when ignition is on but engine will not start. Check VSC has come up. When diagnostic laptop attached it is unable to connect to the ecu for fault code. All very strange as all fine when left last night. Checked fuses, security light flashing and battery ok. Have you any ideas please. Thank you lee

Asked by GuruDQQ6Y Sep 06, 2017 at 04:58 PM about the 2005 Lexus GS 300 RWD

Question type: Maintenance & Repair

Hi, my Lexus gs300 will not crank and start after being fine when parked up the night before. The radiator fan will kick in when ignition is on but engine will not start. Check VSC has come up. When diagnostic laptop attached it is unable to connect to the ecu for fault code. All very strange as all fine when left last night. Checked fuses, security light flashing and battery ok. Have you any ideas please. Thank you lee

3 Answers

170

Have a Tech check the CAS (rear of engine ) as they short the reff voltage from 5v to 4v and this pulls the reff v at the engine ECU. The processor wont work below 4.2volts. No coms no start. Cheers!

8 people found this helpful.
170

If you want to check it yourself, prove no coms with ECU. Disconnect Crank Angle Sensor (plug on rear of port head) then see if you can communicate. Couple of hours work to fit.

9 people found this helpful.
70

My VCS light also came on on my 06 GS300. My specific issue was the emissions. Turns out it was the gas cap that needed to be replaced and when I clear the codes out it never came back and the problem was solved. Why a faulty gas cap shut off the VCS light I have no idea.

2 people found this helpful.

Your Answer:

GS

Looking for a Used GS in your area?

CarGurus has 1,079 nationwide GS listings starting at $1,650.

ZIP:

Own this car?

Share your experience with others.

2005 Lexus GS

Review another car

CarGurus Experts

  • #1
    Melissa Pham
    Reputation
    360
  • #2
    Guru5XDYP
    Reputation
    330
  • #3
    Paul
    Reputation
    310
View All

Know more, shop wisely

Search

Related Models For Sale

Used Lexus IS
283 Great Deals out of 5,380 listings starting at $1,000
Used Lexus LS
126 Great Deals out of 1,758 listings starting at $3,300
Used Lexus ES
465 Great Deals out of 8,798 listings starting at $1,000
Used Lexus GX
230 Great Deals out of 3,679 listings starting at $3,950
Used Lexus RX
859 Great Deals out of 15,066 listings starting at $1,100
Used Toyota Camry
2,067 Great Deals out of 37,359 listings starting at $575
Used Honda Accord
1,539 Great Deals out of 29,750 listings starting at $600
Used Lexus LX
49 Great Deals out of 1,110 listings starting at $6,500
Used Toyota Avalon
192 Great Deals out of 2,106 listings starting at $1,100
Used Mercedes-Benz E-Class
715 Great Deals out of 10,207 listings starting at $1,150
Used BMW 3 Series
1,126 Great Deals out of 13,142 listings starting at $516
Used BMW 5 Series
865 Great Deals out of 11,570 listings starting at $725

Used Cars for Sale

2020 Lexus GS For Sale
3 Great Deals out of 29 listings starting at $22,995
2019 Lexus GS For Sale
5 Great Deals out of 52 listings starting at $26,000
2018 Lexus GS For Sale
5 Great Deals out of 79 listings starting at $18,995
2017 Lexus GS For Sale
4 Great Deals out of 60 listings starting at $17,968
2016 Lexus GS For Sale
5 Great Deals out of 86 listings starting at $16,920

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.