DEF Pump Sensor Harness 84630271 for Silverado Sierra Duramax 2017-2020 L5P

DEF Pump Sensor Harness for Silverado and Sierra

This DEF pump sensor harness transmits vital pressure and temperature data from the DEF reservoir to the engine control module, referencing part number 84630271.

Overview

This DEF pump sensor harness restores direct electrical communication to resolve emissions system diagnostic codes. The DEF pump sensor harness replaces brittle, road-damaged wiring that causes communication failures and engine power derate states. It is a critical fix for diesel truck owners requiring dependable emission control performance during heavy towing.

Built For Performance

• Constructed with thick protective conduit to resist heat, friction, and road grime.
• Features weather-sealed electrical connectors to block out moisture and road salt.
• Engineered with copper wiring pins to ensure stable electrical conductivity.
• Direct-fit terminal lengths prevent excess wire slack and rubbing on chassis parts.

Fits These Machines

• for Silverado 2017-2020
• for Sierra 2017-2020
• for Duramax 2017-2020 L5P

On-The-Job Use

• Resolving diagnostic trouble codes related to DEF sensor signal loss or circuit opens.
• Replacing melted or cut sensor wiring harnesses on commercial work trucks.
• Restoring full engine power after a wiring-related emission system fault code.

Specs At A Glance

Good To Know

Q: Can a broken harness cause a truck to enter limp mode? A: Yes, a loss of communication from the DEF pump sensors can trigger a severe engine power reduction state.

Q: Does this harness require special tools to splice into the truck? A: No, this is a fully direct replacement harness equipped with plug-and-play connectors that require no splicing.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.