Needing CAM and crankshaft sensor testing and relearn info

Tiny
4AFIX
  • MEMBER
  • 2011 CHEVROLET MALIBU
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 182,000 MILES
I first had camshaft sensor bank codes so I had replaced the intake and the exhaust camshaft sensors and ran good for a day or so then I get "Crankshaft Position Camshaft Position Correlation - Bank 1 Sensor A" I am looking for the testing specs for crank sensor and I would also like find the official relearn sequence for cam sensors and even crank shaft

On side note I can't relearn my TPMS sensors for my tires because the only return sequence I found was to use the fob and I did not have a fob and other sequence I found is to use the dashboard menu and this model doesn't have that setting for relearn
Sunday, November 23rd, 2025 AT 11:12 AM

5 Replies

Tiny
4AFIX
  • MEMBER
  • 6 POSTS
This is the first reading and problem occurred
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Sunday, November 23rd, 2025 AT 11:24 AM
Tiny
4AFIX
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  • 6 POSTS
It was raining that day. The air filter was partially wet so so I got the map cleaner and new filter and ran ok clear the codes and took it for a test drive Within half a mile lost power DLC flash reduced engine power read the codes again
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Sunday, November 23rd, 2025 AT 11:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,610 POSTS
Yep, this problem happens when the timing chain, camshaft actuators, guides are worn out, but these codes can be triggered by low or dirty engine oil so make sure the oil and filter are clean and a new filter. What is happening is the camshaft is not in the position is needs to be compared to the crankshaft due to a mechanical problem not a sensor issue. If the engine makes a rattling sound at idle you know this will be the problem. If the engine oil is good you should remove the camshaft oil control valve to see if the screen on the end is clogged, here is the location so you can check it out. Remove both of them for inspection. Check out the images (below). Please upload an image or a short video in your response of the engine idling, so we can hear what's going on.
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Monday, November 24th, 2025 AT 11:07 AM
Tiny
4AFIX
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  • 6 POSTS
I had pulled the vvt int and ext all ready and cleaned it they were Lil dirty but not to bad and I do believe it's the timing chain guides for the fact that there is not a ticking any where else expect on the front port of the engine sound like the chain speeding and the slack is slaps against the side.(In reference in mountain bike when Switching gears)
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Monday, November 24th, 2025 AT 1:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,610 POSTS
Yep, that will do it, 9 time out of 10 with this noise it is not the camshaft sensor. It sounds like you nee a timing chain repair. Please upload a short video in your response of the problem, so I can tell for sure.
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Tuesday, November 25th, 2025 AT 9:15 AM

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