2-Pin 13898956 / 35023594 Waterproof 1.5mm Female Connector – GM Micro-Pack 100 Series

Direct-fit replacement for GM OEM part numbers 13898956 and 35023594, a 2-pin waterproof 1.5mm Micro-Pack 100 connector used across GM sensor harness applications. These two part numbers reference the same physical connector – 13898956 is the current GM catalog number while 35023594 is the superseded predecessor, both fully interchangeable.

Key Specifications

• OEM Part Numbers: 13898956 / 35023594 (interchangeable)
• Pin Count: 2
• Gender: Female (with wire)
• Terminal Pitch: 1.5mm (Micro-Pack 100 series)
• Wire Gauge: 18 AWG (0.5 mm²)
• Wire Length: 5.5 inches (140 mm)
• Waterproof Rating: IP68
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Current Rating: Up to 7.5A per pin

Common Applications

• Coolant temperature sensor (CTS) – 2-pin sensor harness on GM 2.0L–3.6L engines
• Oil pressure sensor connector – engine oil pressure warning circuit
• Fuel pressure sensor harness – direct injection systems
• Transmission fluid temperature sensor
• Ambient air temperature sensor (AAT) – HVAC and engine management

13898956 vs 35023594 – Are They the Same?

Yes. 35023594 is the original GM part number; 13898956 is the current superseding part number. Both refer to the identical 2-pin 1.5mm waterproof connector. When ordering from a GM dealer, 35023594 will be cross-referenced to 13898956 automatically. Either number can be used to verify fitment.

Fault Codes Linked to This Connector

• P0116–P0118 – Engine Coolant Temperature (ECT) sensor circuit faults
• P0520–P0522 – Engine Oil Pressure sensor circuit faults
• P0191–P0193 – Fuel Rail Pressure sensor circuit faults
• P0711–P0713 – Transmission Fluid Temperature sensor circuit faults

Frequently Asked Questions

Q: How do I know if my sensor connector is failing vs the sensor itself?
A: Wiggle the connector while monitoring the sensor reading with a scan tool. If the reading fluctuates or drops out during wiggling, the connector is the fault – not the sensor. A stable reading that is simply out of range indicates a failed sensor.

Q: What crimping tool is needed for 1.5mm GM terminals?
A: Use the Kent-Moore J-38125-8 or Delphi 12085271 ratchet crimper for 1.5mm Micro-Pack 100 terminals.

Q: Can I use 13898956 for both CTS and oil pressure sensor applications?
A: Yes. The 13898956 housing is used for multiple 2-pin sensor applications across GM platforms. The physical connector is identical – the application depends on which harness it is installed in.

Package Contents

1 × 2-Pin Female Connector (13898956 / 35023594) with 18 AWG wire and terminal insert