[size="6"]Hi all,

The ECT/PWR light on the dash of my car is flashing. Been doing it for a couple of weeks now. Car still drives fine, engine good, gearbox good.
I think this maybe a loose connection, dirty sensor? or a component breaking down.

Has anybody had a similar problem or got any ideas as to whats up? I have serviced this car myself for the last 3 years and all has been really well.

I am doing an ecu reset by battery disconnection for an hour so I know memory will be fully clear. I don't think this will solve the problem but worth a try!

This may be beyond me to diagnose and fix so can anyone recommend a lexus dealer or good independant either in Epsom or Bromley areas?

Thanks for any help.[/size]

Hi Stella

I have an identical issue with the Pwr light flashing. I've searched high and low on the forum and found a couple of other mentions of it, but no solutions. It doesn't seem to affect the car in any way. so hopefully it is a faulty switch or something, but I would like to hear from anyone else who has encountered this before I ask the garage to take a look at it for the next service.

[quote name='Jamie1976' date='21 April 2010 - 01:02 PM' timestamp='1271851379' post='717816']
Hi Stella

I have an identical issue with the Pwr light flashing. I've searched high and low on the forum and found a couple of other mentions of it, but no solutions. It doesn't seem to affect the car in any way. so hopefully it is a faulty switch or something, but I would like to hear from anyone else who has encountered this before I ask the garage to take a look at it for the next service.
[/quote]

Hi Jamie1976,

I am still looking into this but have made some progress. I disconnected the battery to clear codes but the light came back flashing same as before. I did a transmission oil flush which was suprisingly easy and although the gear changes seem smoother the light still flashes. I bought an OBD11 reader off Amazon but this was not compatible with the GS300 so could not get the engine codes but will keep the reader for other cars as only £25. Found a method on LOC to read codes by bridging two terminals in engine diagnostic port with a paperclip and then counting light flashes on dashboard, again very very easy. I got DTC P0760 which is shift solenoid c malfunction. Now looking into that, reading around it seems it might be a diy job to drop transmission oil pan and swap out the soleniod or get independant to do it. I am guessing this is going to cost £400 to £600 but at least does not sound gearbox terminal.

Please let me know if you find out anything useful.

[quote name='Stella' date='25 April 2010 - 09:32 AM' timestamp='1272187934' post='718160']
[quote name='Jamie1976' date='21 April 2010 - 01:02 PM' timestamp='1271851379' post='717816']
Hi Stella

I have an identical issue with the Pwr light flashing. I've searched high and low on the forum and found a couple of other mentions of it, but no solutions. It doesn't seem to affect the car in any way. so hopefully it is a faulty switch or something, but I would like to hear from anyone else who has encountered this before I ask the garage to take a look at it for the next service.
[/quote]

Hi Jamie1976,

I am still looking into this but have made some progress. I disconnected the battery to clear codes but the light came back flashing same as before. I did a transmission oil flush which was suprisingly easy and although the gear changes seem smoother the light still flashes. I bought an OBD11 reader off Amazon but this was not compatible with the GS300 so could not get the engine codes but will keep the reader for other cars as only £25. Found a method on LOC to read codes by bridging two terminals in engine diagnostic port with a paperclip and then counting light flashes on dashboard, again very very easy. I got DTC P0760 which is shift solenoid c malfunction. Now looking into that, reading around it seems it might be a diy job to drop transmission oil pan and swap out the soleniod or get independant to do it. I am guessing this is going to cost £400 to £600 but at least does not sound gearbox terminal.

Please let me know if you find out anything useful.
[/quote]

Good work on the diagnosis. I found the following thread which agrees with it:
http://www.lexusownersclub.co.uk/forum/index.php?showtopic=60255&st=0&p=668165&hl=solenoid&fromsearch=1&#entry668165
The author of the post hasn't been active since May last year however so unfortunately I doubt he will be around to verify what happened when he had it fixed.

Hello All,

Iv had the same problem with my 99 GS300 for about a month, recently car started playing up, only reving to 2000 rpm, also seemed like the car was going to stall on me a few times, all while the ETC/PWR light is flashing. So i got my local mechanic to check it out.

The diagnostic report came back with the following error codes:

1). P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
2). P0763 Shift Solenoid C Electrical

My mechanic will get back to my to let me know how much its gonna cost, will post as soon as I find out. The diagnostic cost me £40.

If anyone knows how much this should cost, it would be great to get a heads up.


Thanks for your help and advice.


Cheers Y'all.

I have the same sensor wrong on my and i am in the process of getting it fixed. Lexus have quoted £ 170 just for the sensor while europarts say they have ones for around sixty so thats what you will be looking at for the part for that.

The mechanic told me it will take him around 45 mins to do job so will be looking at around seventy for the work .

Hope it helps.