Hello i need big help prius 2006 U0100 – U0293 - U0128 P3000 P0A1D C1203 -

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by MB PRIUS RENT, Jun 4, 2026 at 11:28 AM.

  1. MB PRIUS RENT

    MB PRIUS RENT New Member

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    When i drive get many foult code its of system start blinking Gearbox lights. When stop / start engine its go to ready driving and when again same. Where į can found problem.
     

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  2. pasadena_commut

    pasadena_commut Senior Member

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    2007 Prius
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    The first picture has a "lost communication" message. The graphs have very sharp drop voltage drops, which are more likely to be data problems than actual HV electrical problems.

    To start with, turn off the car, turn on the headlights for 30s, wait 10 minutes, then check the voltage on the 12V battery (or at the jump point). If it is <11V that could be causing logic problems at start up which might manifest as some of these errors.

    Take out the safety plug, check its contacts for corrosion, put it back in, being triple sure that it is seated correctly. If that was making marginal connections you might see something like this.

    The ECM in the battery might be corroded. Common problem in humid environments, or maybe if one lives near the sea. Corrosion occurs at the connector between the ECM and the sense wires to the pack (and possibly along the full length of the sense wire back to where it connects to the module.)

    If you normally have some device attached to the OBD2 connector, and that was present also when the codes were read, try removing it. A faulty OBD2 device can interfere with communication.

    How long have you had the vehicle? Any recent work before this started happening?