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Showing results for tags '99 5.3 1500 4x4'.
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ok i will start with that im new here but i have a 1999 gmc sierra (new body) 1500 ext cab 4x4 5.3 4l60e im in need of some serious help i dont know where to go from here my truck trans is in limp mode and has no codes other than the EGR but no trans codes! i will start with i have done and checked i have checked all fuses all good i have 12v at ex trans harness so the ignition switch shoould be good good power and grounds at the pcm good ground between batt and engine block and frame new batt new A and B shift solenoid,3-2 shift sol. tcc pwm sol. tcc lock up sol. and internal trans wire harness so i guess is my next step the pcm? any help would be great thanks