Crankshaft sensor relearn?

Tiny
RONALD DEVOLD
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 248,679 MILES
I have been tackling this issue off and on for about a year.
I disassembled the engine after purchase to clean the heads and changed most of the accessories and sensors. So, I have a crank relearn code, A low engine oil warning light, A TPMS light and airbag light. The vehicle does start and drive but I cannot clear any of those codes or error messages.
Wednesday, April 5th, 2023 AT 2:37 AM

3 Replies

Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Hello, RONALD DEVOLD,

What kind of scanner do you have? Do you have the ability to do relearn procedures or does it just read codes?

Also, the code you are getting, is it P1336-Crankshaft Position System Variation Not Learned?

Can you tell me what sensors you replaced?

Are there any other powertrain codes?

Any other powertrain codes and the low oil warning need to be fixed for you to be able to complete the re-learn procedure.

Thank you,
Brendon
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Wednesday, April 5th, 2023 AT 8:46 AM
Tiny
RONALD DEVOLD
  • MEMBER
  • 104 POSTS
I used the Snap-On Solus Pro, Autel MaxiSys MS906BT and Tech2. I replaced the oil pressure sensor (top of engine behind throttle body), crankshaft sensor, temperature sensor and Oil level sensor(on bottom of oil pan).
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Wednesday, April 5th, 2023 AT 3:46 PM
Tiny
BRENDON S
  • MECHANIC
  • 653 POSTS
Good morning, RONALD DEVOLD,

Okay. I have the Solus myself. Really those are all good tools you should be able to do the relearn.

However, because the oil light is on you will not be able to complete the re-learn. You also will not be able to complete it if you have any other P codes.

So, you need to get the low oil level light off. You said that you replaced the Oil Pressure Sensor and the Oil Level Sensor. But the low oil light remains. You do have a lot of miles on that engine I am wondering if your bearing clearances are too far apart causing you to lose enough oil pressure to turn the light on and that is what is keeping the re-learn from completing successfully.

A wiring issue or a faulty sensor is another possibility. A new sensor can be faulty right out the box.

What is your scanner saying for oil pressure?

What is the condition of the oil?

How long ago was it replaced?

My suggestion is to start with the oil itself. I would change the oil and the filter. I use Castrol High Mileage 5w30 in my 6.0 LQ9 and it's at 228k, I am at about 40 psi at idle. Mobil 1 5w30 is good too and cheaper but both meet the oil standards set by GM so I would stick with one or the other. Use a good filter too, K&N or Fram or AC Delco are good options. I think this is a good place to start so at the very least we can rule it out as a possibility. Your vehicle takes 6 quarts.

Check the oil pressure by viewing the data on the scan tool before and after the oil change so we can see if anything changes.

I would also check for any oil leaks especially oil cooler lines and the cooler itself.

Let me know how it goes and message me back.

Thank you,
Brendon
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Thursday, April 6th, 2023 AT 5:44 AM

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