Code P2306?

  • 2011 GMC ACADIA
  • 3.6L
  • 6 CYL
  • 2WD
  • 123,000 MILES
So, I am getting the P2306 which means ignition coil primary circuit low, but I am getting them in all six cylinders?
Do you
have the same problem?
Sunday, August 28th, 2022 AT 6:43 AM

1 Reply

Hello, no, this is only cylinder number 3 Ignition Coil Control Circuit Low Voltage. So, this might be the 12volt feed to the coil, Ill pull up the wiring diagrams, are you getting any cylinder misfire codes at all?
The pink wire with a black stripe (pink/black) is the 12v feed to all the coils. The black wire is the Ground, so you can check for power across those two wires to verify the circuit is okay. These are known as smart coils, so they have a built in Ignition Module. The light blue wire will be the control signal from the ECM and will usually be 0 to 5 volts square wave pulsing signal. That triggers the coil to fire, The Brown wire is the Ref Low, which will be the ECM ground for the control signal. You should check the spark plug too; coil failures are usually a result of the coil being stressed for a certain amount of time. They eventually get hot, and the internal components fail. A lean running cylinder will also cause premature coil failure, because air is the largest resistance the coil has to overcome. And a lean burning cylinder will have more air in the air/fuel mixture.
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Sunday, August 28th, 2022 AT 9:41 AM

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