Codes P0008 and P0017?

Hello,

This vehicle is fitted with the GM High Feature V6 engine

The engine control module (ECM) tests for a misalignment between both camshafts on one bank of the engine and the crankshaft. The misalignment would be at an idler sprocket for either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of the engine, the ECM compares the learned values to a reference value. The ECM will set a DTC if both learned values for one bank of the engine exceed a calibrated threshold in the same direction.

An elongated timing chain is the most common cause for these fault codes to set. This engine has 3, see images below.

The ECM detects that the angle of the camshaft position is out of alignment by more than 10 degrees when compared to a learned value.

A good video:
https://youtu.be/hZyehWKDV-Y

Cheers, Boris

Hello,

If there was a circuit issue with a camshaft position sensor, we would expect to see a different fault code, such as P0365.

P0365 - Exhaust camshaft position sensor circuit.

The camshaft position sensors are supplied with 5V at pin 3, grey wire.
See image 1+2 below, image 2 shows your vehicle's wiring colors.

Pin out at camshaft position sensor.

Pin 1, tan wire - ground
Pin 2, dark green wire - signal
Pin 3, grey wire - 5V

Camshaft position sensor disconnected, ignition on.
Using a voltmeter check that you have 4.8-5.2V at pin 3.
On pin 2 you should see about the same voltage being fed up the signal line.
Pin 1 should have continuity to ground, less than 10ohm resistance.

The signal should be tested using an oscilloscope as the sensor is a hall type sensor and will give out a square wave pattern from 0-5V as the engine rotates, Basic tests can be performed using a voltmeter.

How to use a voltmeter:
https://www.2carpros.com/articles/how-to-use-a-voltmeter

A good video on camshaft position sensor testing:
https://youtu.be/TXKf96wqaoU

Hope this helps.

Cheers, Boris