65-Pin Waterproof Transmission Gearbox Module Connector – OEM 2299987-3 / 2299987-4

The OEM 2299987-3 / 2299987-4 are high-density 65-pin waterproof connectors used in automatic transmission control module (TCM) and gearbox module harnesses. The A and B variants correspond to different connector body configurations on the same transmission platform. Available bare or with 30cm pre-wired leads for direct splice installation.

Key Specifications

Why TCM Connectors Fail

Transmission control module connectors are exposed to ATF (automatic transmission fluid) contamination, thermal cycling, and vibration from the gearbox. Terminal corrosion or fluid ingress causes multiple simultaneous transmission fault codes, harsh shifting, limp mode, or complete transmission failure to engage. Replacing the connector restores clean TCM signal paths and eliminates phantom transmission faults.

Variant Guide

• A Female – Type A bare 65-pin housing (OEM 2299987-3)
• A Female 30CM – Type A with 30cm pre-wired leads
• B Female – Type B bare 65-pin housing (OEM 2299987-4)
• B Female 30CM – Type B with 30cm pre-wired leads

Verify Type A or B by cross-referencing OEM 2299987-3 or 2299987-4 with your transmission wiring diagram.

Installation Steps

1. Disconnect the vehicle battery and allow TCM to power down
2. Drain ATF if necessary to access the transmission connector
3. Use a terminal extraction tool to remove terminals from the original housing one-by-one
4. Transfer terminals to the new housing maintaining exact pin positions
5. Reconnect and use a compatible scanner to clear transmission fault codes
6. Perform a transmission adaptation reset if required

Frequently Asked Questions

Q: What is the difference between Type A (2299987-3) and Type B (2299987-4)?
A: Type A and B correspond to different connector body configurations on the same transmission platform. Cross-reference your transmission wiring diagram to confirm which type your vehicle uses.

Q: What fault codes indicate a failed TCM connector?
A: Common codes include P0700 (TCM malfunction), P0715–P0720 (input/output speed sensor), P0730–P0736 (incorrect gear ratio), and U-codes for CAN bus communication faults with the TCM.

Q: Is a transmission adaptation reset required after replacement?
A: Yes. After any TCM harness repair, a transmission adaptation reset is recommended using a compatible scan tool to allow the TCM to relearn shift points.

Q: Are all 65 terminals included?
A: Yes, the connector set includes the housing and all required terminals.

Compatible Applications

• Automatic transmission control module (TCM) harness repair
• Gearbox module connector replacement (OEM 2299987-3 / 2299987-4)
• High-density transmission harness applications requiring 65-pin sealed connectors