Damaged Camshaft Position Sensor Exciter Wheel

There may be an intermittent extended crank or intermittent crank/no start condition on some 2020-2021 Silverado, Sierra; and 2021 Tahoe, Suburban, Yukon, and Escalade models equipped with the 3.0L diesel engine (RPO LM2). DTC P0341 (Camshaft Position Sensor Performance) may be set in the Engine Control Module.

If these conditions are present, the camshaft position sensor exciter wheel, or trigger wheel, may be damaged. (Fig. 12, #1) Remove the camshaft position sensor and use a bore scope to inspect for a bent exciter wheel on the camshaft. It will be necessary to roll the engine by hand, up to two revolutions, to inspect each wheel segment.

 

Fig. 12

 

Shown is a normal exciter wheel (Fig. 13, A) and a bent exciter wheel. (Fig. 13, B) The damaged wheel may or may not make contact with the timing chain.

 

Fig. 13

 

If the camshaft position sensor exciter wheel is bent, it should be replaced. (Fig. 14) If the wheel is not damaged, follow the appropriate Service Information diagnostics for an intermittent crank/no start condition.

 

Fig. 14

 

For more information, refer to #PIP5806.

 

– Thanks to Robert Bastien

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2 Comments

  1. Since no comment is made on how they are bending here or in the bulletin, I would assume it was bent during assembly of the engine. There are no other parts needed so nothing is out of place inside the engine and bending the exciter wheel.

  2. Greg Young says:

    What is causing the exciter wheel to bend

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