I have a 2006 GMC Envoy and the check engine light comes on intermittently, I took it to two auto parts places to have them read the code and both scanners would not read at all??
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You need to go to a auto parts store like Autozone, they will read the fault codes for free and provide you with a printout of the reason for the check engine light being on.
What did they say is wrong with it? The I6 engine is a very good engine, don't hear that often, especially with an 06. Lots of people have over 200K miles on it and still running strong. Mine has 178K and still going strong. Now if yours has the V8 engine, I haven't heard any good, OR bad for that matter.
You can take your vehicle to a place like Auto Zone, they can read the fault code with scanner, or you can buy a OBD II scanner for anywhere between $50 to $100. Interpreting the codes may require some knowledge of the car though.
A number of Auto parts stores offer "FREE" diagnostic scans in the hopes that you will buy their parts although most have a "no obligation" policy. Autozone .... Advance auto parts are a couple that offer free OBD II scans
Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) #05-06-02-012B - (10/19/2006)
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.
This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.
Replace the wire harness:
Part Number 89024920 Description Harness Assembly, Engine Cooling Fan Wiring
The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.
There are many, many resons for the check engine light to come on the dash. Just because a parts store reads the code for a certain system, does not mean to just go ahead and replace the part the code says. Many different things can affect any particular system. Replaceing and EGR- lets say, because of an EGR system code may not fix the problem. Anything from broken wires, computer programming update, to clogged passages, to a bad catalytic converter can cuase an EGR code. Tech JK
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