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Bad speed sensor equals no VTEC?????

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Old 11-27-2003, 11:34 AM
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Default Bad speed sensor equals no VTEC?????
Hey i know for a fact my speed sensor is messed up and cracked. And there is an CEL code for the speed sensor. But nothing else. VTEC is not working and i have plenty of oil. The speed sensor is for sure messed up. I have one on the way. should this fix my probs???
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Old 11-27-2003, 12:32 PM
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Default Re: Bad speed sensor equals no VTEC????? (stehigs321)
yes u have to be going a certain speed tfor vtec to engage.
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Old 11-27-2003, 12:45 PM
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Default Re: Bad speed sensor equals no VTEC????? (D16z6Coupe)
no speedometer = no vtec
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Old 02-26-2019, 05:00 PM
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Default Re: Bad speed sensor equals no VTEC?????
Having vtec problems myself. Was thinking it was my speed sensor but gauges all work fine, I can restart car and vtec will work but it seems like it's missing then goes into limp mode. Put a brand new vtec on it and no changes
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Old 02-26-2019, 06:03 PM
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Default Re: Bad speed sensor equals no VTEC????? (D16z6Coupe)
Originally Posted by DumpedSi
no speedometer = no vtec
X2 - Also speedometer may peg out as if you had over-revved the engine and needle got stuck on the high side of the peg.
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Old 02-26-2019, 06:34 PM
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Default Re: Bad speed sensor equals no VTEC?????
CEL on for any reason means limp mode with no VTEC. When you turn key off and back on, the ECU goes back to normal mode until the problem is detected again.
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Old 02-26-2019, 10:16 PM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by Rsx questions
Having vtec problems myself. Was thinking it was my speed sensor but gauges all work fine, I can restart car and vtec will work but it seems like it's missing then goes into limp mode. Put a brand new vtec on it and no changes
Yeah, what codes do you have ???
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Old 02-27-2019, 05:26 AM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by mk378
CEL on for any reason means limp mode with no VTEC. When you turn key off and back on, the ECU goes back to normal mode until the problem is detected again.
this
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Old 02-27-2019, 11:06 AM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by BiggieBert

this
Is wrong. Some CEL codes will prevent vtec.
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Old 02-27-2019, 11:13 AM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by stin1

Is wrong. Some CEL codes will prevent vtec.
so your saying CEL will allow VTEC to engage? Bc I’m saying a CEL will STOP vtec from engaging...
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Old 02-27-2019, 01:01 PM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by BiggieBert

so your saying CEL will allow VTEC to engage? Bc I’m saying a CEL will STOP vtec from engaging...
Yes .
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Old 02-27-2019, 02:50 PM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by JRCivic1
Yeah, what codes do you have ???

P2647 HONDA - Rocker Arm Oil Pressure Switch Circuit High Voltage,

Oil change is fresh. And vtec works goes in and out like it's trying to work but takes longer for it to go into limp mode while it's cold
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Old 02-27-2019, 03:31 PM
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Default Re: Bad speed sensor equals no VTEC?????
What do you mean by "goes in and out like its trying to work"? It either works or it doesn't work.
Your solenoid could be dirty or broken.
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Old 02-27-2019, 03:45 PM
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Default Re: Bad speed sensor equals no VTEC?????
You feel it engage then let's off and engages again. Brand new vtec solenoid. screens are clean. Oils clean
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Old 02-27-2019, 10:57 PM
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Default Re: Bad speed sensor equals no VTEC?????
Originally Posted by mk378
CEL on for any reason means limp mode with no VTEC. When you turn key off and back on, the ECU goes back to normal mode until the problem is detected again.
Originally Posted by BiggieBert

this
stin1 is actually correct... minor codes like an emissions related code or an O2 heater circuit code will not keep VTEC from engaging. MAJOR codes like TDC/CKP/CYP, ECT, TPS, or VTEC solenoid/pressure switch will prevent VTEC function.
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Old 03-01-2019, 05:16 PM
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Default Re: Bad speed sensor equals no VTEC?????
just went through this too.
bad speed sensor = no vtec or odometer or cruise control.
tried the cheaper manual trans sensors but they are crap.
the $140 standard motor unit from rockauto finally settled down
and stopped glitching and has 3 year warranty.
the denso unit is $200 or so but can be had from japan for $113

https://jp-customparts.com/
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