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2005 GMC Sierra 1500 Base Reg Cab 119.0 WB Work Truck

2005 GMC Sierra 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.5' Wideside
16 mpg city / 22 mpg hwy
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December 16, 2012, 10:30 am

Dallas B

Question: P1133 p1153 p0650 are showing running rich

My 2005 gmc sierra 5.3 l having problems with these codes changed post cat sensors was running good for couple days then codes came back ran outta ideas

December 21, 2012, 10:41 am

Elizabeth K

p0650 means there is a problem with the MIL (malfunction indicator lamp) circuit. Does the Check Engine Light come on when you turn the key to ON (not START)? If not check the bulb behind the dash for it. Sometimes people remove the bulb because they are unable to fix a problem causing the MIL to come on.

P1133: 02 Sensor Bank 1 Sensor 1 Insufficient Switching
P1153: 02 Sensor Bank 2 Sensor 1 Insufficient Switching

Did you test the pre-cat o2 sensors? 'Sensor 1' indicates primary sensors, not post-cat.

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