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Code P2645

Tiny
CHUCKA
  • MEMBER
  • 2014 CHEVROLET MALIBU
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
My son's car listed above is the LS model. It has thrown a code P2645 - "A" rocker arm actuator control circuit/open bank 1. I replaced the intake variable valve timing (VVT) solenoid (ACDELCO 12662737) and turned off the check engine light. After driving around 10 miles the check engine light came back on with the same code. My son says there is a hesitation at around 35 to 40 mph. I've turned off the check engine light 3 times and the light comes back on. I replaced the camshaft position sensor and the exhaust variable valve timing (VVT) solenoid at around 57000 miles. I use Pennzoil Platinum 5w20 full synthetic and the last oil change was at 84,000. Any ideas what could be wrong? Thanks.
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Tuesday, December 3rd, 2019 AT 7:59 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The code indicates an electrical issue with the actuator. You need to check all the connections to be sure they are clean and secure.

Do you have a scan tool that can read live data? I attached a wiring diagram for you to view.

Roy

Diagnostic Aids
If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status parameters for the component. The circuit status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.
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Tuesday, December 3rd, 2019 AT 8:34 AM
Tiny
CHUCKA
  • MEMBER
  • 4 POSTS
Good evening.

Thanks for the quick response.

I don't think the scan tool reads live data on a car this new, but I will check. The condition is not intermittent. It started about 2 weeks ago and the code comes back on after I turn it off after driving a short distance. It does not go off by itself.
The wiring diagram that you included even when enlarged makes for difficult reading, but it appears from this diagram, the only sensor that I did not replace is the engine oil pressure sensor. Could this cause the code? When I replaced the other sensors, I did spray/clean the connectors and apply dielectric grease.

Chuck
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Tuesday, December 3rd, 2019 AT 4:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, this is not a component issue at all.

My guess is the actuator is stuck in one position. That will create a timing issue. The cause is dirt in the oil passages of the actuator. I would suggest having the oil system pressure flushed with an acid fluid. It is not an additive and an oil change it is a pressure flush of all internal passages.

Roy
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Tuesday, December 3rd, 2019 AT 4:29 PM
Tiny
CHUCKA
  • MEMBER
  • 4 POSTS
The scan tool I have does do freeze frame.

When you say you don't think it is a component issue, are you saying that you think it is dirt in the oil passages leading up to the actuator and not dirt in the oil passages of the actual actuator because I just replaced the intake actuator (VVT solenoid)?

Thanks, Chuck
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Wednesday, December 4th, 2019 AT 5:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I am saying there is dirt in the passages.

Roy
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Wednesday, December 4th, 2019 AT 5:33 AM

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