Question about 2003 Toyota Prius

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2003 Prius Hybrid System Warning Light

The red light with the car came on last year(2007). So took it to a local dealer and I can not remember what they fixed. Well, low and behold, it happen again 1 month ago. Waited till next morning to go to dealer, and the warning light magically disappeared. So I turned around and life continued till today. Bang, there it was again. What's going on? All electrical functions are working.

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  • aslkdjwoie Jun 26, 2008

    My 2003 Prius triangle warning light has been coming on (along with the check engine light) at least once a week, it seems to me that it occurs when it is over 100 degrees outside...unforutnately I live in Texas and it is always over 100 degrees. With the warning lights on it drives very slow. If I pull over and wait 10 minutes then it goes back to normal but the warning lights stay on.Could this be an overheating problem? It only has 50,000 miles on it and gets regular check ups. Thanks.

  • Janet Davis Cope Dec 30, 2013

    My 2003 Prius did this and it was the Hybrid battery, $2500.00 dollars and about eight hours I was back on the road again.

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My Toyota Prius hybrid warning light has come on three times in eight years. If I turn the car off for 20 minutes, the hybrid light is off but the check engine light is on. After a while, the check engine light goes off. I think this problem is related to moisture somehow entering the hybrid vent on the driver's side. All three times this has happened, the weather was wet. Kevin Cardiff

Posted on Jan 05, 2011

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I have a 2003 Prius and the big Red triangle came on and the gas engine won't start up. I could only move with electric power. After several attempts at various things, our dealer in Tysons Corner, Va said it was the ECM (electronic control modual). Big bucks but he said it was covered under the extended warranty. He put one in. Seemed to be fine. Two weeks later same thing. Long and short of it was he put three in before it worked right. Appartently there are some new ones with problems. it has been working fine since. Vernon

Posted on Sep 28, 2008

The red triangle w/exclamation point happened on our 2007 Prius. Turns out it was unidentifiable debris that had melted onto the air flow sensor wires in the air intake box. That debris caused jumbled signals from the sensor, causing the computer to be confused enough to give up and shut us down. Could have happened to any car with an air flow sensor feeding a computer control system.

Posted on Jul 03, 2008

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How do u wired a prius hibrid gear box?

Posted on Oct 23, 2008

These lights can come on for a multiple reasons, and they never indicate to you, the driver, which one. Among the reasons I've found are:

Oil level too low.
Oil level too high.
Brake fluid too low.
Radiator fluid too low.

Posted on Jun 29, 2008

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1 Answer

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You will need to have this light reset with a scan tool, it is stored in a non-volatile (stays in memory with or without battery voltage) memory. Have the dealer check the cause, better than a tow bill.

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2 Answers

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I had the same problem. I unplugged the relays from the fuse/relay box under the bonnet. (Top left side) and replaced them. The problem disappeared. (2001 Prius 109,000 miles)

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