SureTrack Community Fix: Implausible Problem

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version.

So you have a vehicle in your shop with a trouble code, you replace obviously bad parts but the code returns. The SureTrack community comes to the rescue. SureTrack community member Mlopez2008 had a GMC Terrain in their shop with a code P0017 camshaft code. They posed the question to the community, and with the help of fellow community member Markbob and others, they were able to resolve the issue quickly.

The following Community Fix summarizes the interaction between members of the community that led to the solution.

Vehicle
2017 GMC Terrain SLE 2.4L

Title
Code P0017, slipping tone ring.

Complaint
Customer states that check engine light is on.

Diagnostic Steps Performed/Parts Replaced
Checked for codes and found P0017 – Crankshaft Position – Exhaust Camshaft Position Not Plausible. Cleared code and it returns. Found timing chain loose and exhaust actuator not parked. Replaced timing chain and actuators (GM parts). Swapped cam sensors. Solus edge info at idle shows intake command percentage at 43 and exhaust command percentage at 0. Desired exhaust position at 0 intake at 16; Actual exhaust 0 intake16. When I jump the exhaust solenoid the engine will miss, like it should, but the Solus does NOT change as far as the actual readings. What am i missing, ECM?

Best Answer from Community Member Markbob
Have you checked out GM PIP4548G ? It’s for the cam sensor reluctor wheel slipping on the camshaft. Never personally seen it happen but might be worth a look in your case.

Cause
Got a second car in here with the same LEA engine. Pulled valve cover, lined up timing marks and there it was, the tone ring had moved a quarter inch.

Correction
Removed and replaced exhaust cam and followers. Cleared codes and test drove vehicle. Code did not return.


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About the Author

Nick Taylor

Nick Taylor is the SureTrack Community Administrator and a Senior Applications Specialist at Mitchell 1 with over 25 years of experience with electronic repair data systems. Nick previously worked in the automotive dismantling and engine rebuilding industries.