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2008 GMC Sierra 1500 WT 5.3L Poor Idle Quality, MIL Lamp on
Posted to GM Driveability on 7/16/2009 6 Replies

check eng. light on p0121 p0506 idle goes up and down sometimes too low eng. hesitates

i did replaced throttle body, and clear codes run good for five minutes until i step on the gas rpm goes up but it won't come down until you shut off the eng. or put it on ...

6 Replies Received (View Replies)

  Related Documents & Media  2008 GMC Sierra 1500 WT

 
Message Closed w/FIX

car Vehicle Data

2008 GMC Sierra 1500 WT

VIN 2GTEK19JX8
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / V8 SFI (LY5)
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, MIL Lamp On
OccursAlways, Idle

Trouble Codes

P0121Throttle Position Sensor Range/Performance
P0506Idle Speed Control System Lower Than Expected
Message Closed w/FIX

car Vehicle Data

2008 GMC Sierra 1500 WT

VIN 2GTEK19JX8
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / V8 SFI (LY5)
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, MIL Lamp On
OccursAlways, Idle

Trouble Codes

P0121Throttle Position Sensor Range/Performance
P0506Idle Speed Control System Lower Than Expected