GMC Envoy Throttle And Cam Sensor Codes

Question:
2006 GMC Envoy. Engine size = 4.2L. Computer codes = P0300 P2119- recently, P0014-previously replaced an air intake plenum to correct snow intrusion. Please confirm what the code P2119 means. I am thinking a Throttle Body issue. Seems a lot of work for a truck driven less than 2,500 miles since buying used. Only 19958 when bought would sit for a long period create this problem as they original diagnosed it as a dirty camshaft actuator solenoid. Throttle body service, replaced spark plugs, coil connector boots and seal with die-electric grease. Dried out galleries filled with water and seal with die-electric grease. Thanks.

Answer:
Yes, code P2119 is an idle speed error set for the electronic Throttle Control (TAC) on your Envoy. This code can return after a throttle cleaning even though the problem has been corrected. After this you need to do an idle re-learn. This is done with a dealer scan tool, but you can try it without- although it does not work very often.

To do that, start and let idle for 5 minutes with A/C off. Turn ignition off for 1 minute. Start and idle again for 5 minutes, turn key off for 1 minute. Drive truck up to 45 MPH, then brake to a stop 3 times while idling for 30 seconds in between.

The problem as I said is that this does not often work, so the dealer would need to do it. If neither of these things work, then there is a problem in the throttle itself and would need to be replaced. Yes, code P0014 is usually the Camshaft Actuator Solenoid on your GMC- pretty common to fail- either electronically, or leaking oil internally and getting all over the solenoid connector.

Question:
I'm not getting spark from the three coils at the back side of the motor. What is the sensor parked next to the crank shaft sensor.

Answer:
2004 GMC Envoy XL. On the 4.2L Vortec engine, each individual ignition coil is a seperate circuit, so there is nothing in common with the 3 in the rear (#4,5,6) that can cause them all to not fire. All coils get power from the same fuse - labeled #28 PCM 1. They each are triggered on a seperate circuit from the PCM. So, most likely those three are just bad. You can try swapping one of them with one in the front that does work and see if the problem follows the coil. If confirmed bad coils, just replace all six since they are very common to fail.

The sensor next to the crank postion sensor on the drivers side of the engine is the knock sensor #2, rear.

Reply:
I tried swamping coils around already as they are all new. The knock sensor has a crack in the plug would that possibly keep the coils from firing?

Answer:
No, the knock sensor would not cause those three coils to not fire. If the coils are new and spark plugs are good then i would trace the wiring from each coil into the main harness and look for piched or broken wires.

Reply:
Thank you I've got juice to the coils and they are not working.tested the coils and they are good.any suggestions?

Answer:
Well, if you have power to the coils and you are SURE they are good, and you are SURE there is no spark from them, then your problem is either a bad PCM or the coil trigger circuit from the PCM.

Question:
2004 GMC Envoy. I have no codes getting like 6 mpg. No engine lite. Sometimes spit and supers when coming from a stop. What should i look in to no gas leaks.

Answer:
If you're getting such horrible gas mileage then you may have a leaking fuel pressure regulator. You would not see a leak but you might smell it in the exhaust. When the fuel pressure regulator (FPR) goes bad they leak fuel into the vacuum hose that controls it. Raw fuel would be dumping into the engine causing it to run bad and giving it poor fuel economy.