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ECU/PCM rattling/knocking noise under acceleration

Discussion in '3rd Gen. Tacomas (2016-2023)' started by sammyedmonton, Jul 23, 2023.

  1. Jul 23, 2023 at 4:59 PM
    #1
    sammyedmonton

    sammyedmonton [OP] New Member

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    2021 Tacoma TRD OffRoad
    Tundra Throttle Body, aFe air filter, custom air intake tube
    Hey Guys,

    I have a '21 TRD Offroad v6 (AT) with 25k kms. About 1k kms ago the truck started making this weird knocking/rattling noise when i accelerated between 1800-2000 rpm and then over 3000 rpm - basically under hard acceleration. The noise seems to go away after 3300 rpm.

    After scouring many threads and checking for loose exhaust sheilds, cat substrates and suspension parts I was able to locate it around the pcm/ecu area.

    I installed a tundra throttle body and spacer around 5000 km and had no issues. Any idea what it might be? Could it be a faulty crankshaft sensor messing up the ecu?

    Any assistance would be greatly appreciated as I am left with no choice but have the stealership diagnose it.

    Thanks in advance
     
  2. Jul 23, 2023 at 5:58 PM
    #2
    Vlady

    Vlady Well-Known Member

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    I assume you have a smart phone.
    Download fusion obd app(free), buy inside the app toyota pids for your year($16). Amazon has adapters for different OS for 15-20. Veepeak is one of them.
    Once installed app and obtain toyota parameters package, build a simple dashboard to display knock, misfires, etc. Drive around and see if your issues reflect on the dashboard.
     
    Junkhead, OBXPaul and Chew like this.
  3. Jul 23, 2023 at 6:25 PM
    #3
    TnShooter

    TnShooter The TacomaWorld Stray

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    I am confused.
    Are you saying a part is physically loose and rattling?
    Or is the engine making a rattling sound?

    A bad crank sensor wouldn’t make a part come loose and rattle?
     
    Chew likes this.
  4. Jul 23, 2023 at 7:39 PM
    #4
    sammyedmonton

    sammyedmonton [OP] New Member

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    Tundra Throttle Body, aFe air filter, custom air intake tube
    When i accelerate there is a rattling noise coming from under the steering wheel right where the ECU and fuses are.
     
  5. Jul 23, 2023 at 9:15 PM
    #5
    Vlady

    Vlady Well-Known Member

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    Ecu on the passenger side, fuse boxes on the driver side.
    Crankshaft position sensor will cause limp mode or stalled engine.
    Any other symptoms?
     
  6. Jul 23, 2023 at 9:19 PM
    #6
    sammyedmonton

    sammyedmonton [OP] New Member

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    Tundra Throttle Body, aFe air filter, custom air intake tube
    No loss of power or drag on engine while acceleration- just that rattling sound from the driver side footwell. My apologies i didn’t know the ecu was located near passenger side, with all the wiring underneath i assumed it was on the driver side.

    i will record the sound and post it tomorrow.
     
  7. Jul 23, 2023 at 9:27 PM
    #7
    Chew

    Chew Not so well known user

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    Amazon dog poo bed mat mod
    I like @Vlady idea, today’s tech this is so affordable and of many of other uses too.
     
    Junkhead likes this.
  8. Jul 24, 2023 at 7:43 PM
    #8
    sammyedmonton

    sammyedmonton [OP] New Member

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    Tundra Throttle Body, aFe air filter, custom air intake tube
    here it is.....

    https://youtube.com/shorts/RcLXPFTgUQc

    This is while accelerating from dead stop all the way to 3000 rpm and you can notice the rattling go away as soon as I crossed 3000 rpm.
     
  9. Jul 24, 2023 at 8:19 PM
    #9
    lavrishevo

    lavrishevo Well-Known Member

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    Last edited: Jul 24, 2023
  10. Mar 14, 2024 at 3:29 PM
    #10
    Latoya82

    Latoya82 New Member

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    Hi Sammy did you ever figure out the problem. Having same issues with Lincoln Navigator
     

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