No start after replacing crankshaft position sensor and reluctor wheel

[codyc_21]

I just completed a ton of work to my EcoDiesel. I had engine and transmission out, major items replaced were intake manifold, turbo, and CPS/reluctor wheel. Everything is back together now and I can't get is started. I suspect its the new CPS. The reluctor wheel I got straight from Mopar but the sensor I got off amazon (yes, I know, shame on me). When I try to start everything in the dash appears normal, no check engine light and no codes stored (there are some random permanent codes stored). Its keyless and when I press to start the engine will crank for approx 1 second and then stop. I've cycled it on and off to ensure the fuel pressure is building from the tank to the HPFP. I can see from the scanner that fuel rail pressure will start to build in that 1 sec of cranking. After lots of trouble shooting still no codes. The tachometer does not move when I try to start and I also see 0 rpms in the scanner when I try to start. Does the tach kick in that quickly? I can't remember. Does anyone know of other reasons why the ecodiesel would crank momentarily and then stop? There doesn't seem to be a good way to see the CPS signal from a scanner (I'm using alfaOBD), anyone know how to hook up an oscilliscope to see the raw sensor signal (There is a youtube of someone showing the results, but not how to hook it up).

 

[codyc_21]

Following up in case anyone else runs across this in the future. I took the transmission back out and replaced the crank sensor with the old OEM sensor. Put everything back together and it started first try. I guess there is no room for non OEM parts on this engine.

 

[autoX]

OEM or carefully pick through the reviews. Risky on difficult to access part.
My Amazon CPS for VW is working fine and got a spare (so cheap).

I bot EBAY park sensors, oh man they were barely operable, then fault out = useless. Tried my best.

NAPA or Lordco non-OEM were fine
Amazon, after confirming with reviews, and were Bosch, also OK. The RAM seems to eat park sensors :/

For TPMS, going out of my mind ... I got an Autel scanner to gain visibility. I thought FCA was all similar. They are not. I can scan for model/year to confirm operation & compatibility (RAM, Jeep & Fiat this and that). Range Rover I gave up, coded it out and live free

PS: Heres reviews of the A-Premiun 3.0 CPS. I have bought A-prem parts in the past and they have been good, so not sure why they would keep selling this one:

Aime Ruel
1.0 out of 5 stars Junk
Reviewed in Canada on February 17, 2026
Verified Purchase
Junk. Did not work after dropping the transmission and then putting it all back together. Not an easy job. Do not buy this junk.
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Steve
1.0 out of 5 stars It doesn't work
Reviewed in Canada on June 18, 2025
Verified Purchase
G bought this product thinking it would do well by putting something new but the product did not work so several dollars invested for nothing is not nothing to change this piece it costs in a thousand dollars,, defective product to buy really a waste of time
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Translated from French by Amazon
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From other countries

Logan
1.0 out of 5 stars Doesn’t work
Reviewed in the United States on November 10, 2024
Verified Purchase
Doesn’t work. No signal. Wasted tons of time and money on stupid part that doesn’t work. What a joke. I guess they don’t test their products. It’s a sensor so only one thing to test

Do not buy. Do not buy
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Korey B.
1.0 out of 5 stars Costs 1500 to install
Reviewed in the United States on July 12, 2024
Verified Purchase
And ended up not working. How do these companies get away with saying their products work with your vehicle.