The APDTY 141821 6-Wire Wiring Harness Pigtail is a direct-replacement connector for the throttle actuator control (TAC) module on the accelerator pedal position sensor side. Designed for 2005–2007 GM trucks, SUVs, and full-size vans equipped with 4.8L, 5.3L, or 6.0L LS engines, this 10-slot pigtail repairs melted, corroded, or damaged throttle pedal wiring that can trigger throttle position codes, limp mode, or erratic throttle response.
Key Takeaways
- Direct-fit 6-wire, 10-slot pigtail for the TAC module on the accelerator pedal sensor side
- Fits 2005–2007 Cadillac Escalade, Chevrolet Silverado/Suburban/Tahoe/Express, GMC Sierra/Yukon/Savana, and Hummer H2 with 4.8L, 5.3L, or 6.0L LS engines
- Replaces GM 15305916 and aftermarket PT1105 and S1207
- Solves throttle position sensor codes (P2135, P2138), reduced engine power warnings, and hard-starting issues
- Professional soldering and heat-shrink connections recommended for durable repair
Buy APDTY 141821 directly from APDTY
What Is the APDTY 141821 Throttle Pedal Pigtail Connector?
The APDTY 141821 is a 6-wire wiring harness pigtail that connects the vehicle's main harness to the throttle actuator control (TAC) module on the accelerator pedal position sensor. The TAC system is part of the drive-by-wire throttle, replacing the traditional throttle cable with electronic signals. When the pigtail connector becomes brittle, melted, or corroded—common in high-heat underdash environments—the pedal sensor cannot communicate accurately with the engine control module (ECM), triggering faults and performance issues.
This pigtail features a 10-slot housing and six wires, matching the OEM pedal-side TAC connector on 2005–2007 GM trucks and SUVs with LS-series engines. It is a repair component, allowing technicians to cut out the damaged section of the original harness and splice in fresh wiring without replacing the entire pedal assembly or main harness.
Which Vehicles Does APDTY 141821 Fit?
The APDTY 141821 is compatible with the following 2005–2007 General Motors vehicles equipped with 4.8L, 5.3L, or 6.0L LS engines:
- Cadillac: Escalade (2005–2007)
- Chevrolet: Express 1500/2500/3500 Van (2005–2007, LS engine), Silverado 1500/2500/3500 (2005–2007, LS engine), Suburban (2005–2007), Tahoe (2005–2007)
- GMC: Savana 1500/2500/3500 (2005–2007, LS engine), Sierra 1500/2500/3500 (2005–2007, LS engine), Yukon (2005–2007, LS engine)
- Hummer: H2 (2005–2007)
Important: Fitment is limited to vehicles with the specified LS engine displacements. If your vehicle falls within the model years above but has a different engine, verify compatibility by inspecting your existing connector or consulting the live compatibility chart on APDTY.com before ordering.
What Are the Symptoms of a Bad Throttle Pedal Wiring Harness?
A failing or damaged throttle pedal pigtail connector typically produces one or more of the following symptoms:
- Check Engine Light (CEL) or Reduced Engine Power Warning: Codes P2135 (Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation) and P2138 (Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation) are common when the pedal sensor signal is erratic or lost.
- Limp Mode (Reduced Power): The ECM limits throttle opening to protect the engine when it detects invalid pedal-position data, resulting in sluggish acceleration and low RPM ceiling.
- No Throttle Response or Delayed Response: Intermittent open or short circuits in the pigtail can cause the accelerator pedal to feel dead or lag several seconds behind foot input.
- Hard Starting or Stalling: If the ECM cannot read pedal position at startup, the engine may crank but fail to run, or stall immediately after starting.
- Erratic Idle: Corroded pins or loose terminals may cause fluctuating idle speed as the signal drops in and out.
Visual inspection often reveals melted plastic, green or white corrosion on terminals, cracked insulation, or burn marks near the connector—clear indicators that the pigtail requires replacement.
APDTY 141821 Specifications and OE Cross-Reference
| Specification | Detail |
|---|---|
| APDTY Part Number | 141821 |
| Connector Type | 10-Slot, 6-Wire Pigtail |
| Application | TAC Module (Accelerator Pedal Position Sensor Side) |
| Replaces OE Number | GM 15305916 |
| Replaces Aftermarket | PT1105, S1207 |
| Fitment | 2005–2007 GM Trucks/SUVs/Vans with 4.8L, 5.3L, or 6.0L LS Engine |
| Wire Count | 6 |
| Connector Housing Slots | 10 |
This pigtail is designed to match the OEM GM 15305916 connector and supersedes common aftermarket numbers PT1105 and S1207, ensuring correct pin layout and wire gauge for reliable signal integrity.
How to Install the APDTY 141821 Throttle Pedal Pigtail (General Overview)
Tools and Materials: Wire strippers, soldering iron, rosin-core solder, heat-shrink tubing, crimping tool (optional), electrical tape, multimeter, and a factory service manual or wiring diagram for your vehicle.
General Installation Steps:
- Disconnect the Battery: Remove the negative terminal and wait at least two minutes to allow the airbag system capacitors to discharge before working under the dash.
- Access the Throttle Pedal Connector: Remove the driver-side lower dash panel to expose the accelerator pedal assembly. Unplug the existing connector from the TAC module on the pedal.
- Inspect and Cut Damaged Wiring: Examine the old pigtail for melted insulation, corrosion, or burnt terminals. Cut the harness several inches behind the damaged section, leaving clean, undamaged wire on the vehicle side.
- Strip and Tin the Wires: Strip approximately ¼ inch of insulation from each wire on both the vehicle harness and the new pigtail. Apply a thin coat of solder to each exposed conductor (tinning) to ensure a strong connection.
- Solder and Heat-Shrink: Match wire colors and solder each pair together, overlapping the conductors and applying heat until the solder flows completely. Slide heat-shrink tubing over each joint and shrink with a heat gun or lighter. Stagger the joints to prevent shorts.
- Reconnect and Test: Plug the new pigtail into the TAC module on the pedal. Use a multimeter to verify continuity and resistance on each circuit according to the factory service manual. Reconnect the battery and start the vehicle.
- Clear Codes and Road Test: Use an OBD-II scanner to clear any stored throttle position codes. Test-drive the vehicle to confirm smooth throttle response and no warning lights.
Safety Note: If you are uncomfortable soldering or working with electrical systems, have a qualified technician perform the installation. Poor solder joints or crossed wires can cause repeat failures or additional fault codes.
Frequently asked questions
Will APDTY 141821 work on 2008 or newer GM trucks?
This pigtail is designed specifically for 2005–2007 models with 4.8L, 5.3L, or 6.0L LS engines. For 2008+ vehicles, verify your connector pin count and layout; GM updated some throttle pedal connectors in later model years.
Can I use crimp connectors instead of soldering?
Soldering is strongly recommended for throttle pedal wiring to ensure low resistance and vibration-proof connections. High-quality crimp connectors with heat-shrink are acceptable if properly executed, but solder joints provide superior long-term reliability in underdash heat.
What if I still get codes P2135 or P2138 after replacing the pigtail?
If the pigtail is intact and the codes persist, the accelerator pedal position sensor itself may be faulty, or there may be an issue with the throttle body actuator or ECM. Perform a wiggle test on the new pigtail with the key on to rule out intermittent connections, then test the sensor per factory specifications.
Does this pigtail come pre-wired to the pedal sensor?
No, APDTY 141821 is a repair pigtail with loose wire ends on one side and a molded connector on the other. You must cut out the damaged section of your existing harness and splice the new pigtail in using solder or crimp connections.
The APDTY 141821 6-Wire Throttle Pedal Pigtail is the professional-grade solution for repairing corroded, melted, or damaged TAC module wiring on 2005–2007 GM trucks, SUVs, and full-size vans with LS engines. By restoring clean, low-resistance connections between the accelerator pedal sensor and the ECM, this pigtail eliminates reduced-power warnings, throttle position codes, and erratic throttle response—often at a fraction of the cost of a new pedal assembly or full harness replacement. If you're experiencing P2135 or P2138 codes and visible connector damage, the APDTY 141821 delivers the durability and fit you need to get back on the road with confidence.