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Old 01-06-2023, 05:11 PM   #2
Mouse330
 
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Drives: 2011 2SS, 2006 GMC Sierra
Join Date: Jul 2019
Location: MA
Posts: 316
Check the lobes on the camshaft for wear. If the lobes have unusual wear or are worn you would have to replace it. Make sure the follower that rides on the cam to push in the pump, is not damaged or sticking in the bore

Also from TSB PIP5209C

Recommendation/Instructions
Re-check the terminals at the ECM for fit and tension as well as the crimp to wire connection.

Terminals to inspect in the ECM are connector x2 terminals 3, 18, and 19 for the fuel rail pressure sensor.

Connector x3 terminals 16 and 32 for the high pressure fuel pump.

Note: As little as 2 Ω on either circuit can cause DTCs to set

If any concerns are found, replace the affected terminals and verify the vehicle is repaired.
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