The APDTY 116721 5-Wire Wiring Pigtail Connector is a direct-replacement harness connector designed specifically for the LOMA (Lifter Oil Manifold Assembly) on GM LS engines equipped with DOD (Displacement On Demand) or AFM (Active Fuel Management) systems. This connector restores proper electrical communication between the engine computer and the LOMA solenoids, fixing codes and performance issues caused by damaged or corroded factory wiring.
Key Takeaways
- Direct replacement for factory LOMA wiring connector on GM AFM/DOD LS engines
- 5-wire design matches OE connectors, replaces PT1154, S-1054, 15306027, 12126477, 21023367
- Fits numerous GM models from 1993 to 2020 with AFM or DOD cylinder deactivation
- Repairs damaged or melted connector terminals without replacing entire harness
- Check live compatibility chart on APDTY.com for exact vehicle fitment
Buy APDTY 116721 directly from APDTY
What Does the APDTY 116721 Connector Do?
The APDTY 116721 is a repair pigtail for the electrical connection to the LOMA (Lifter Oil Manifold Assembly) on GM LS engines. The LOMA controls oil flow to cylinder deactivation solenoids in engines with AFM (Active Fuel Management) or DOD (Displacement On Demand) technology. When the factory connector becomes damaged, corroded, or melted from heat exposure, it disrupts the electrical signal between the engine control module (ECM) and the LOMA solenoids, triggering check engine lights and disabling fuel-saving cylinder deactivation.
This 5-wire pigtail allows you to cut out the damaged section of the factory harness and splice in fresh, sealed terminals—restoring full function without the cost of a complete engine harness replacement.
What Are the Symptoms of a Failed LOMA Connector?
A damaged or corroded LOMA connector typically produces one or more of the following symptoms:
- Check engine light: Diagnostic trouble codes related to AFM/DOD solenoid circuits (P0521, P0520, P3400, P3401, P3425, P3441, P3449, or similar)
- Rough idle or misfire: Poor oil pressure control to lifters may cause valvetrain noise or uneven cylinder firing
- Loss of fuel economy: AFM/DOD system stops deactivating cylinders due to communication fault
- Melted or blackened connector pins: Visible heat damage or corrosion at the LOMA harness plug
- Oil pressure gauge fluctuation: Erratic oil pressure readings if the LOMA sensor circuit is affected
If you observe any of these issues alongside visible connector damage, the APDTY 116721 pigtail is the correct repair solution.
Which Vehicles Does the APDTY 116721 Fit?
According to APDTY's verified product data, the 116721 connector is compatible with numerous GM models from 1993 to 2020 that are equipped with LS engines featuring DOD or AFM cylinder deactivation systems. The connector fits the LOMA (Lifter Oil Manifold Assembly) and may also be used on other compatible components sharing the same 5-wire connector design.
Important: The provided data does not list specific vehicle makes, models, or engine codes. To confirm exact fitment for your vehicle, always check the live compatibility chart on the APDTY product page before ordering. Enter your year, make, and model to verify the 116721 is the correct connector for your application.
APDTY 116721 Specifications and Cross-References
The APDTY 116721 meets or exceeds OE connector specifications for the LOMA harness:
| Specification | Detail |
|---|---|
| APDTY Part Number | 116721 |
| Connector Type | 5-Wire Wiring Pigtail |
| Application | LOMA (Lifter Oil Manifold Assembly) on AFM/DOD LS Engines |
| Replaces OE Numbers | 15306027, 12126477, 21023367 |
| Replaces Aftermarket Numbers | PT1154, S-1054, S1054 |
| Compatibility Range | Numerous GM models, 1993–2020 (check live chart for exact fitment) |
| Condition | Brand New |
This cross-reference list helps you confirm the 116721 matches your factory or shop manual's specified connector number.
How Do You Install the APDTY 116721 Pigtail Connector?
Installing the APDTY 116721 involves splicing the new pigtail into your existing engine harness. This is a repair connector and requires cutting and splicing wires. Follow these general steps:
- Disconnect the battery: Always disconnect the negative battery terminal before working on engine electrical systems.
- Locate the damaged connector: The LOMA connector is typically mounted on the driver's side of the engine block near the valley cover or intake manifold (location varies by engine).
- Cut out the damaged section: Use wire cutters to remove the melted or corroded connector and approximately 2–3 inches of damaged wire upstream.
- Strip and prepare wires: Strip back 1/4 inch of insulation from both the harness wires and the 116721 pigtail leads. Match wire colors or use a wiring diagram to confirm correct pairing.
- Splice and seal: Use crimp butt connectors, solder and heat-shrink tubing, or weatherproof crimp splices to join each wire. Ensure all connections are mechanically secure and moisture-sealed.
- Reconnect and test: Plug the new pigtail into the LOMA assembly, reconnect the battery, clear any stored diagnostic codes, and verify the AFM/DOD system operates correctly.
Note: If you are not comfortable splicing automotive wiring, have a qualified technician perform this repair. Poor splices can cause intermittent faults or create fire hazards.
Frequently asked questions
Will the APDTY 116721 fit my truck if it has AFM or DOD?
The 116721 is designed for GM LS engines with AFM/DOD from 1993 to 2020, but you must verify exact fitment using the live compatibility chart on APDTY.com. Enter your vehicle's year, make, and model to confirm the connector matches your LOMA assembly.
Can I use this pigtail on other GM connectors besides the LOMA?
Yes, the product description notes it is compatible with numerous components. If another GM sensor or solenoid uses the same 5-wire connector style and pinout, the 116721 may work as a repair pigtail. Always verify pin configuration before splicing.
Do I need to solder the wires, or can I use crimp connectors?
Both methods are acceptable. Crimping with weatherproof butt connectors is faster; soldering with heat-shrink tubing provides a more durable, corrosion-resistant bond. Ensure all splices are mechanically secure and sealed against moisture.
Will replacing the connector fix my AFM lifter failure codes?
If the root cause is a damaged or corroded connector, yes—the 116721 will restore electrical communication and clear related codes. However, if the LOMA solenoids or lifters themselves are mechanically failed, you may also need to replace those components.
The APDTY 116721 5-Wire Wiring Pigtail is the professional-grade solution for repairing damaged LOMA connectors on GM AFM and DOD LS engines. By replacing only the failed connector section, you save time and money compared to full harness replacement—while restoring proper cylinder deactivation function and eliminating check engine codes. Verify your vehicle's compatibility on APDTY.com, order the 116721 today, and get your GM engine's fuel-saving technology back online.