SB-10057670-5692
File in Section:

Service Bulletin

Bulletin No.:
Date:

PIP3694F
March, 2015

PRELIMINARY INFORMATION
Subject:

Belt Noise Rough Idle and/or SES Light with DTC P0014 and/or P0017 - Inspect CMP
Actuator Solenoid And Crankshaft End Play

Models:

2004-2009 Chevrolet TrailBlazer
2004-2012 Chevrolet Colorado
2004-2011 GMC Envoy
2004-2012 GMC Canyon
2004-2009 Hummer H3
with an Inline 4, 5, or 6 Cylinder Engine
(RPO Codes L52, LK5 LL8 LLR LLV)
This PI was superseded to update Models. Please discard PIP3694E.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern
Some customers may complain of an engine belt noise, rough idle, and/or SES light with DTC P0014 and/or P0017.
If a rough idle is experienced, a P0106 may also be stored.

Recommendation/Instructions
If the SI diagnosis does not isolate the cause of this concern, perform the steps below:
1. Inspect the camshaft actuator solenoid screens below:

1752543

(1) Screen for Advance Pressure to Camshaft Actuator
(2) Screen for Pressurized Oil from Oil Pump
(3) Screen for Retard Pressure to Camshaft Actuator

If any of these screens are missing, replace the camshaft actuator solenoid, change the engine oil and filter, and
re-evaluate the concern. If none of the screens are missing, proceed to step 2 below.
2. Measure the crankshaft end play to determine if it is within the specification of 0.0044in - 0.0153in (0.112 - 0.388
mm). If the crankshaft end play is only .001in or so above specification, it is probably not causing this concern.
Typically, if excessive crankshaft end play is causing this concern, it will be obviously out of specification by as
much as .050in or more when a pry bar is used to move the crankshaft back and forth. Normally it is so obvious
that you can see the excessive movement without using a dial indicator.
• 2.1) If crankshaft end play is acceptable, replace the camshaft actuator solenoid and re-evaluate the concern.
• 2.2) If the crankshaft end play is obviously out of specification, engine replacement is suggested to prevent
DTCs P0014 and/or P0017 from returning again due to trace amounts of thrust bearing debris that may remain
inside of the engine during alternate repairs, such as crankshaft and bearing replacement. If the vehicle is
under warranty contact the PQC (Product Quality Center) with the engine unit numbers and an engine
replacement estimate at 1-866-654-7654 before replacing the engine.
• 2.3) If you prefer to repair the engine instead of replace it due to special circumstances, such as an engine
backorder situation, no warranty coverage left, or the customer would prefer to have their original engine
repaired, you may replace the crankshaft and bearings if the engine block is repairable and it is more
cost-effective to repair the engine.
Note: Due to the sensitivity of the CMP actuator system and the tight clearances in the Cam Actuator, the vehicle
may return with DTCs P0014 and/or P0017 if you do not get 100% of the old thrust bearing debris out of the engine
when the repairs are made.
If you decide to replace the crankshaft and bearings for this concern, first remove the oil pan to inspect the engine
block and determine if it has been damaged by the crankshaft.
If engine block damage is present, replace the engine.
If no engine block damage is present, completely is assemble the engine and inspect everything that could have
been damaged by the thrust bearing debris, such as the cam bearing journals, cam lobes, cam followers, lash
adjusters, timing chain and guides, oil pump, etc...
The CMP actuator solenoid and sprocket assembly should be replaced due to thrust bearing material that may be
trapped inside of either component.
Before replacing the damaged/contaminated components and reassembling the engine, thoroughly clean all of the
cylinder head and engine block oil galleys with oil galley brushes and soapy water. Also, thoroughly clean all other
areas of the engine that would have contacted the old oil and thrust bearing debris, such as the inside of the cam
cover, front cover, rear cover, timing chain guides, oil pan, oil galleys in the nose of the exhaust camshaft, etc..
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.