exhaust cam phaser - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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Old 10-11-2011, 12:48 PM
70TA 70TA is offline
Junior Member
2004 Chevy TrailBlazer LT
Dark Gray Metallic 4.2L I6 4X4
Join Date: Oct 2011
Location: Indianapolis
Posts: 1
exhaust cam phaser

First post here. My 2004 TB has 106K miles and is sometimes running rough at idle or near idle. Seems to happen intermittently and only when at full operating temperature. It is throwing DTC codes P0014 and P0016. I replaced both the Cam Position Sensor and Cam Position Actuator Solenoid then my mechanic performed the "relearn" procedure and did an engine oil flush. The old CPAS looked somewhat dirty but no screens were missing. After all this, there is no improvement and the DTC codes are still being thrown. My mechanic says the exhaust cam phaser under the valve cover needs replaced. Does this sound legitimate? At $700 I want to be sure. What would be physically wrong with the exhaust cam phaser? Should the timing chain be replaced too?
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Old 10-11-2011, 11:18 PM
tsench's Avatar
tsench tsench is offline
Junior Member
2002 Chevy TrailBlazer LT
Moondust Metallic 4.2L I6 4X4
Join Date: Sep 2011
Location: Igloo
Posts: 22
ill check all the wiring first before jump into anything once you have all good connection then make yourself a jumper cable with fuse on it and jump B+ and the CMP actuator control circuit at the solenoid and jump the low reference of the camshaft position actuator solenoid to ground you should see the pin inside move if not replace CMP

and for code P0014
you need tech 2
scan it check all the module see there any missing communication or any U code
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Old 10-11-2011, 11:37 PM
CJ2006 CJ2006 is offline
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2006 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Sep 2011
Location: KC, MO
Posts: 8
70TA, I am having this exact same issue. My shop told me the phaser is sticking in full advance or retard mode. They can get the phaser to move but it sticks in one of those two positions. I have heard that dirty engine oil can cause this issue, but doesn't seem to be a factor in my situation. Good luck!
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Old 10-09-2013, 05:05 PM
Vinchester Vinchester is offline
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qwerty qwerty qwerty
qwerty 5.3L V8 4X4
Join Date: Oct 2013
Location: Palo Alto, USA
Posts: 17
I really liked this*information.

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