05 tahoe RPM issue

Tahoefam91 · Oct 13, 2024

Hey guys new to the group. Bought an 05 Tahoe z71 that runs great. Only issue is my RPM gauge reads “0” at idle. It idles just fine and the gauge will go up when I drive but when it hits 1k rpm it feels like it should be way more like 3-4k rpm. Thought it was the stepper motor but I just soldered all new steppers last night and still having the issue. Anyone else have this problem before?

strutaeng · Oct 13, 2024

Hook up a scanner that has live data and see what the ECU is reporting for RPM. If that looks good, sounds like a cluster issue.

It was doing the exact same thing before you replaced the stepper motor?

Welcome and that's a pretty low mileage rig you got there! Congrats!

Tahoefam91 · Oct 13, 2024

strutaeng said:
Hook up a scanner that has live data and see what the ECU is reporting for RPM. If that looks good, sounds like a cluster issue.

It was doing the exact same thing before you replaced the stepper motor?

Welcome and that's a pretty low mileage rig you got there! Congrats!

Thank you! And yes it was doing the same thing before I did the stepper motors.

Fless · Oct 13, 2024

If the scanner's rpm agrees with the cluster's value, then I'd be looking at the crankshaft position sensor. If you do replace that, recommend OE brand and do a CASE relearn after changing.

You could try using something like this to independently check the rpm; I use something similar on small engines:

https://www.amazon.com/Runleader-Self-Powered-Maintenance-Replaceable-Snowmobile/dp/B08S2XBYWB/ref=pd_ci_mcx_pspc_dp_2_t_4?pd_rd_w=NtP30&content-id=amzn1.sym.2dfc1605-9ad4-4767-b699-ffe3b61e0dc9&pf_rd_p=2dfc1605-9ad4-4767-b699-ffe3b61e0dc9&pf_rd_r=0NPRSNKK6YAG3RVRT3N9&pd_rd_wg=aqzMR&pd_rd_r=f4c6de3f-e7f3-4a1b-9d50-6d6773b7b378&pd_rd_i=B08S2XBYWB

Tonyrodz · Oct 13, 2024

Has that low mileage been verified? That can also happen when a cluster has previously been rebuilt and the needles weren't put back in the correct orientation. Mine is a little off also. I removed my cluster needles and didn't put them back on correctly.

Tahoefam91 · Oct 14, 2024

Tonyrodz said:
Has that low mileage been verified? That can also happen when a cluster has previously been rebuilt and the needles weren't put back in the correct orientation. Mine is a little off also. I removed my cluster needles and didn't put them back on correctly.

When I had it apart the Speedo was the only stepper that was replaced before, everything else was factory

Tonyrodz · Oct 14, 2024

Tahoefam91 said:
When I had it apart the Speedo was the only stepper that was replaced before, everything else was factory

Did it work correctly when you 1st bought it? I assume you bought it used.
To replace 1 or all stepper motors all the needles need to come off, correct?

Tahoefam91 · Oct 15, 2024

Tonyrodz said:
Did it work correctly when you 1st bought it? I assume you bought it used.
To replace 1 or all stepper motors all the needles need to come off, correct?

Yea all needles need to come off, even to just do 1 stepper. Did the same thing when I bought it, could it be in the wrong spot?

Tonyrodz · Oct 15, 2024

Tahoefam91 said:
Yea all needles need to come off, even to just do 1 stepper. Did the same thing when I bought it, could it be in the wrong spot?

Could be.

Fless · Oct 16, 2024

What's the scanner show and how does that compare to the gauge?

05 tahoe RPM issue

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