03 Sierra Throttle By Wire... - 1999-2013 Silverado Dec 13, 2011Wow, my 2003 1500HD with a 6.0 just started doing this. Checked wiring and grounds and could not duplicate. I had code 2135 and 0120. Replaced throttle body and pedal. 2003 chevy 5.3 throttle body wiring harness | eBay Find great deals on eBay for 2003 chevy 5.3 throttle body wiring harness. Shop with confidence. Skip to main content. eBay Logo: THROTTLE BODY 03 2003 CHEVY SILVERADO GMC SIERRA 5 1257080 See more like this. OEM Genuine Throttle Body 16400-RAA-A61 Fit For 2003-2007 Honda Accord 2. Refurbished.
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