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My check engine light is on, and the codes seem to alternate between P0011 and P0012:

P0011: "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0012: "A" Camshaft Position - Timing Over-Retarded (Bank 1)

They don't happen at the same time, not even as pending codes.

The car is a 2011 Hyundai Accent ("MC" generation).

Things I've done:

  • Replaced the oil and filter
  • Replaced the oil control valve
  • Cleaned the oil control valve filter
  • Replaced the camshaft position sensor
  • Replaced the VVT actuator
  • Replaced the timing belt and tensioner

What else could the problem be?

Brent McCarthy
  • 11
  • 3

1 Answers1

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This was apparently caused by low oil pressure. It was fixed by replacing the journal bearings on the crankshaft and using a higher viscosity oil.

Brent McCarthy
  • 11
  • 3