The P0702: Transmission Control System Electrical refers to an electrical malfunction in the transmission control system. This could be caused by faulty wiring, poor electrical connections, or a defective Transmission Control Module (TCM).
P0702 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0702: Transmission Control System Electrical |
| Is it serious? | Yes, as electrical issues in the transmission control system can prevent proper transmission function and cause drivability problems. |
| Possible causes | – Electrical malfunction in the transmission control system – Faulty wiring or connectors – Defective transmission control module (TCM) |
| How to diagnose? | – Check electrical connections and wiring – Test the TCM for electrical faults – Inspect related fuses and relays |
P0702 Meaning
The P0702 code indicates an electrical issue within the transmission control system, potentially due to damaged wiring, poor electrical connections, or a fault within the Transmission Control Module (TCM). Electrical issues can prevent the transmission from receiving the correct signals, leading to shifting problems or even transmission failure.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other transmission-related codes that may provide additional information about the problem. | OBD-II Scanner |
| Inspect Electrical Connections and Wiring | Visually inspect the wiring and electrical connections between the TCM and transmission sensors for signs of damage, corrosion, or loose connections. | Flashlight, Multimeter |
| Test the TCM for Electrical Faults | Use a diagnostic tool to test the Transmission Control Module (TCM) for any electrical issues, such as short circuits or power loss. | Diagnostic Tool |
| Inspect Fuses and Relays | Check the fuses and relays related to the transmission control system to ensure they are not blown or malfunctioning. Replace as necessary. | Fuse Tester, Multimeter |
| Test Transmission Control System Components | Test the electrical components of the transmission control system, such as solenoids and actuators, to ensure they are receiving proper voltage and operating correctly. | Diagnostic Tool, Multimeter |
| Repair or Replace Faulty Components | If wiring, connectors, or components are found faulty, repair or replace them as necessary to restore proper electrical connections in the transmission control system. | Replacement Parts, Standard Tools |
| Clear Code and Retest | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0702 code has not returned. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko