Question about GMC Envoy
Posted by Anonymous on
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Posted on Jan 02, 2017
po455 is Probable Cause[s]
1. Defective, loose or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4 . Vacuum leak at engine po121 code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.
Posted on Feb 27, 2010
the engine light is a generic fault indicator in your car to point out something is not quite right with the engine, having a loss of power as well is also known in some areas as Limp Mode or Safety Mode. it means the car is restricting the power it gives to ensure no damage it done to the engine.
the only certain way to find out what is wrong is to take it to a garage that has diagnostics equipment that can read the fault codes from the vechicles ECU (the fault codes will be the reason the light on the dash has come on as its reporting a fault somewhere)..
your mechanic should be able to tell you what is wrong with the engine from that and give you a more accurate cost at fixing it.
Posted on Dec 29, 2009
I would advise to take it to a shop you trust and let them scan your vehicle for trouble codes. From there they can give you an idea as to why these messages appeared. : )
Posted on May 21, 2011
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