2006 GMC Envoy P0455 EVAP Large Leak

2006 GMC Envoy P0455 EVAP Large Leak

GMC Envoy On the 2006 GMC Envoy, the P0455 is a very general code that simply states there is a large leak in the EVAP (emissions control/recovery) System. First place to start here is with the fuel cap. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those “universal” or “locking” fuel caps…

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2011 GMC Terrain P0017 Exhaust Camshaft Bank1

2011 GMC Terrain P0017 Exhaust Camshaft Bank1

GMC Terrain On the 20011 GMC Terrain with the 3.0L engine, the P0017 points to a problem with the crankshaft and exhaust camshaft for bank1 being out of sync. This is more commonly due to a faulty Camshaft Position Actuator Solenoid Valve. This valve plays a role in the variable valve timing system. This system advances/retards the timing to provide the best fuel economy and performance for any given driving condition. When the valve isn’t working properly, the cam-crank will be out of sync. More times than not, then get clogged…

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2009 GMC Acadia P0017 Cam-Crank Correlation

2009 GMC Acadia P0017 Cam-Crank Correlation

GMC Acadia On the 2009 GMC Acadia, the P0017 points to a problem with the camshaft-crankshaft correlation on bank 1 exhaust side. There is a “known issue” on the 3.6L engine on this year when a “correlation” code sets. The 3.6L is very well known for the timing chain to “jump” due to a problem with the chain and/or the chain tensioner. However- when this is the case, more times than not, there are multiple correlation codes (P0017 – P0021). So, if this is the only code set, best place to…

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2003 GMC Sierra 2500 P0120 P2135

2003 GMC Sierra 2500 P0120 P2135

GMC Sierra On the 2003 GMC Sierra, the P0120 and P2135  are both pointing to a problem with the throttle position sensor. On this vehicle, the throttle position sensor is built into and part of the Throttle Body assembly. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If no problems are found, many time a good cleaning can solve this problem. Using some throttle cleaner and a toothbrush and shop rag, try to clean as much build-up from the throttle bore, plate, and plate…

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1999 GMC Safari P1351 Ignition Module

1999 GMC Safari P1351 Ignition Module

GMC Safari On the 1999 GMC Safari, the P1351 is a fairly straight forward code that points to a problem with the Ignition Control Module. The ICM is located on the top, passenger’s side of the engine, just behind the Alternator. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the inspection checks ok, replacing the Ignition Control Module should solve the problem. Does your vehicle have a similar problem? Get connected to a Live Q&A session with a certified Auto Mechanic and get your…

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2007 GMC Yukon Denali P1825 Mode Switch

2007 GMC Yukon Denali P1825 Mode Switch

GMC Yukon On the 2007 GMC Yukon Denali, the P1825 points to a problem with the Transmission Mode Switch. The IMS is part of a wire harness, which connects electrically to the control solenoid valve assembly. It is serviced separately from the control solenoid valve assembly. Inspect the IMS, harness, connector, and control solenoid valve assembly pins for metallic debris. Check for an incorrectly adjusted range selector lever cable. Visually inspect the manual shaft detent assembly for proper alignment with the manual shaft detent lever. The manual shaft detent roller must…

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Chip Install: 2014 GMC 1500 6.2L

Chip Install: 2014 GMC 1500 6.2L

GMC Sierra 1500 On the 2014 GMC Sierra 1500 with the 6.2L engine, the intake air temp sensor is built into the Mass Air Flow Sensor. The MAF/IAT Sensor is mounted to the Air Filter Housing outlet tube. At the IAT Sensor, the wire colors are: White/Dark Blue = IAT Signal ( + )White/Black = Signal Ground ( – ) Does your vehicle have a similar problem? Get connected to a Live Q&A session with a certified Auto Mechanic and get your answers on this problem now!

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1999 GMC Suburban P1345 Distributor

1999 GMC Suburban P1345 Distributor

GMC Suburban On the 1999 GMC Suburban, the P1345  is actually a very common problem on many GM trucks/SUVs with an 8-cylinder engine. The code is pointing to a fault withe Cam/Crank correlation. Most commonly here- the Distributor. There is a quick easy test for this. With the engine running, does the idle fluctuate? If not, shut the engine off and remove the distributor cap. Gently grab the rotor and try to rotate it left and right. I think you’ll find there is “play” when rotating it (there should be NO movement). This is…

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2002 GMC Envoy Ambient Temp Sensor

2002 GMC Envoy Ambient Temp Sensor

GMC Envoy On the 2002 GMC Envoy, when the outside temp display is not working, this is most commonly due to a problem with the Ambient Air Temp sensor. The air temperature sensors are a 2 wire negative temperature co-efficient thermistor. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40°C (-40°F) to 101°C (215°F) . You can find the sensor under the hood mounted to the radiator fan shroud….

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2009 GMC Arcadia Headlight Bulb Access

2009 GMC Arcadia Headlight Bulb Access

GMC Arcadia On the 2009 GMC Arcadia, the best way to access the headlight bulbs on this vehicle is to remove the wheel house liner. Once you remove the liner, you will have a clear access to the bulb covers. Turn the headlight bulb cover counter-clockwise to remove it. Unplug the electrical connector to the bulb. Rotate the bulb assembly a quarter turn counter-clockwise to release it from the headlight assembly. Does your vehicle have a similar problem? Get connected to a Live Q&A session with a certified Auto Mechanic…

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