Symptoms of a P0017 will or may include:
•Malfunction Indicator Lamp (MIL) illumination
•The engine may run but with reduced performance
•The engine may crank but not start
•The engine may exhibit a rattle near the harmonic balancer indicating the tone ring is damaged
•The engine may start and run, but poorly
Causes may include:
•Timing chain stretched, or timing belt skipped a tooth due to wear
•Misalignment of timing belt/chain
•Tone ring on crankshaft slipped/broken
•Tone ring on camshaft slipped/broken
•Bad crank sensor
•Bad cam sensor
•Damaged wiring to crank/cam sensor
•Timing belt/chain tensioner damaged
•An improperly torqued crankshaft balancer
•A mis-built or mis-timed engine
•A loose or missing crankshaft balancer bolt
•The CMP actuator solenoid stuck open
•The CMP actuator stuck in a position other than 0 degrees
If your vehicle is new enough that is still has powertrain warranty, please let the dealer perform the repairs.
1. First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
2. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
3. If the signal appears normal, then check the timing chain/belt for proper alignment. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched. Repair and recheck.
2011 Colorado CC Z71 2LT 4X4 3.7L with a few mods