This procedure addresses a non-existent component. The 2014-2018 Chevrolet Silverado 1500 with 5.3L V8 is equipped with an 6L80 electronic automatic transmission that does not use a kickdown cable.

Warnings

Tools required

Preparation

1. Verify transmission type - this vehicle uses 6L80 electronic automatic transmission
2. Park vehicle on level ground and set parking brake
3. Ensure engine is off and key is removed from ignition

Procedure

1. 1

   Confirm Transmission Type
   Locate the transmission identification tag on the driver's side of the transmission case near the pan. Verify this is a 6L80 6-speed automatic transmission. This transmission uses full electronic control with no mechanical kickdown cable.
2. 2

   Inspect Electronic Throttle System
   If experiencing poor shift timing or delayed kickdown, inspect the electronic throttle body and accelerator pedal position sensor connections. Check for loose connectors at the throttle body (mounted on intake manifold) and accelerator pedal assembly.
3. 3

   Check for Diagnostic Trouble Codes
   Connect a diagnostic scan tool to the OBD-II port located under the driver's side dashboard. Read any stored trouble codes related to throttle position sensor (P0121-P0123), accelerator pedal position sensor (P2120-P2135), or transmission controls (P0700 series codes).
4. 4

   Verify Throttle Position Sensor Operation
   Using the scan tool, monitor throttle position percentage in live data. With engine off and key in ON position, slowly depress accelerator pedal from 0% to 100%. Throttle position should increase smoothly without jumps or dropouts. Any irregular readings indicate sensor or wiring issues.
5. 5

   Test Transmission Shift Performance
   If no codes are present and sensors test properly, perform a test drive. Accelerate moderately through all gears, then perform a wide-open-throttle acceleration from 30 mph. The transmission should downshift aggressively (kickdown function). If shift timing is still incorrect, transmission control module programming or internal transmission issues may be present.

Reassembly

1. No disassembly required for this diagnostic procedure
2. Clear any diagnostic trouble codes after repairs are completed
3. If throttle position or accelerator pedal sensors were replaced, perform idle relearn procedure per GM service information

Verification

• Confirm no diagnostic trouble codes are present for throttle or transmission systems
• Test drive vehicle and verify smooth acceleration and proper kickdown behavior during wide-open-throttle acceleration
• Verify throttle position sensor reads 0% at idle and reaches 100% at full pedal travel using scan tool

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