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 23 nationwide GS listings starting at $6,995.

Postal Code:

CarGurus Experts

  • #1
    Melissa Pham
    Reputation
    370
  • #2
    Guru5XDYP
    Reputation
    340
  • #3
    Paul
    Reputation
    310
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Lexus IS
18 Great Deals out of 305 listings starting at $6,449
Used Lexus LS
28 listings starting at $9,995
Used Lexus ES
15 Great Deals out of 192 listings starting at $3,888
Used Lexus GX
4 Great Deals out of 54 listings starting at $13,800
Used Lexus RX
38 Great Deals out of 858 listings starting at $3,995
Used Honda Accord
43 Great Deals out of 907 listings starting at $1,599
Used Toyota Camry
48 Great Deals out of 979 listings starting at $2,212
Used Lexus LX
4 Great Deals out of 27 listings starting at $28,900
Used Mercedes-Benz E-Class
30 Great Deals out of 498 listings starting at $5,700
Used BMW 5 Series
18 Great Deals out of 323 listings starting at $4,500

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.