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I got 2009 gmc savanna 6.0 it runs but has no rpm pulse and…

Customer Question
hello I got 2009 gmc...
hello I got 2009 gmc savanna 6.0 it runs but has no rpm pulse and has code p0335
Submitted: 2 years ago.Category: GM
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Answered in 23 minutes by:
3/3/2016
GM Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: GM
Satisfied Customers: 1,532
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Verified

This code sets when the PCM does not detect a crank signal - the 6.0L engine can still start and run on cam position and intake air flow. It'll just take longer cranking times to start.

P0335 is a crank position sensor circuit signal missing code and it's best diagnosed starting with a thorough visual inspection of the sensor, its connector and the wires going to it. If that doesn't reveal the fault, then a scope is recommended to test the actual signal.

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Customer reply replied 2 years ago
I put new sensor and wire conector from dealer still same,i just change the engine with reman.
Customer reply replied 2 years ago
what scope test
Customer reply replied 2 years ago
I have no pulse I tested the wire and one has grount middle one and both has 5 volts
GM Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

What tools are you using to test this?

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Customer reply replied 2 years ago
just the snap on scanner
GM Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

I'm not familiar with that scanner, but if it's equivalent to a Tech-II, then it should show crank speed on the list of PIDs. Does it?

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Customer reply replied 2 years ago
I have the feature but no rpm
GM Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

OK then, your scan tool has done its job, it's just that the signal is either not getting to the PCM or the PCM can't process it.

If you don't have access to a scope (much much cheaper than most good dmm's), then a very fast digital voltmeter might be able to pick up the RPM signal from the White/Black wire at the sensor. If there's no signal, then the reluctor ring on the crank might be missing. I've attached the sensor connector graphic for your reference. Please let me know what you find.

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Customer reply replied 2 years ago
good morning I ck the wires fromt computer and im getting ground,5 volts and no pulse
Customer reply replied 2 years ago
I ck the reluctor it is fine it is the same as the old engine
GM Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

OK. This is where we are with this issue: PCM says there is no crank signal; your scan tool says the same; you say reluctor is fine.

What does that leave us: possible faulty crank sensor, possible open circuit in sensor or PCM connector, possible open circuit in harness from sensor to PCM, possible faulty PCM.

How do we find out: we start by checking whether or not the signal is getting to the PCM at the White/Black wire going to PCM connector X2 terminal 68. If the signal is getting there, then the PCM must be bad. If the signal is not getting there, then we go back to the crank sensor connector and test there. If the signal still isn't there, either the crank senosr itself is bad or it is not being triggered by the reluctor ring.

What tools do we use to test the signal: best tool is a scope; second best is a voltmeter that can read frequency in Hertz (Hz). Don't have either one? How about rigging a Noid light?

In other words, my friend, I have the technical knowledge and experience to help you diagnose this issue and most of all, I really really want to help you, but it is up to you to get the tools you need to do this.

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