christianice8
Undervoltage error Lexus IS
Summary of the thread
A 2005 Lexus IS diesel with 245,993 km was experiencing an error message related to the fault memory being locked. The initial suspicion was an undervoltage issue. It was suggested to check the battery and charging system, particularly the alternator, and to seek professional diagnostics. The problem was confirmed to be undervoltage, resolved by replacing the voltage regulator, costing 240€.
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4 comment(s)
christianice8 (community.author)
I haven't checked the charging system output, admittedly. I was leaning towards undervoltage as a potential cause, as I've heard it can cause the ECU to act up. What voltage levels should I be looking for when testing the battery and charging system?
isabellsturm1
Given the mileage and the undervoltage suspicion, it is advisable to have the battery and alternator professionally tested. Considering the fault memory lock, a visit to a trusted automotive workshop equipped with advanced diagnostics would be most prudent at this stage to prevent further complications.
christianice8 (community.author)
Thanks for the advice! Took it to a workshop, and you nailed it - turns out there was indeed an undervoltage issue. A new voltage regulator, and a diagnostic check cost me 240€. All sorted now!
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LEXUS
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IS
isabellsturm1
Undervoltage, you say? Interesting. Have you checked the battery's condition and the charging system output? What fault codes are you pulling, if any? Is the car exhibiting any other symptoms beyond the error message?