Diagnostic trouble code P1702 is a manufacturer-specific powertrain fault code. Because it is manufacturer-specific, its exact definition depends entirely on the vehicle make, model, and application.
Exact vehicle application must be verified before diagnosis. The code identifies a detected condition in a specific subsystem, but further testing is required to identify the root cause.
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Key Takeaways
- P1702 is a manufacturer-specific code, meaning its definition varies between automakers like Ford, General Motors, and Chrysler.
- On Ford and Chrysler applications, it typically indicates a Transmission Range Sensor (TRS) circuit intermittent fault.
- On GM applications, it often indicates a Torque Converter Clutch (TCC) circuit intermittent or slipping fault.
- Diagnosis requires verifying the exact factory definition and testing the relevant sensors, solenoids, or wiring.
- Repairs depend on the confirmed root cause and may involve replacing a sensor, solenoid, or repairing wiring.
P1702 Code Description and Implications
Because P1702 is manufacturer-specific, there is no single universal definition. This error code identifies a detected condition, but the exact monitored system depends on the vehicle make and model.
Some Ford and Chrysler applications: P1702 indicates a “Transmission Range Sensor (TRS) Circuit Intermittent” fault, meaning the module detects an erratic or dropping signal from the gear position sensor.
Certain General Motors applications: P1702 indicates a “Torque Converter Clutch (TCC) Circuit Intermittent” or transmission component slipping fault, pointing to an issue with the lockup clutch control.
Common Causes of the P1702 Code
The underlying cause depends entirely on the verified factory definition for the specific vehicle application.
For Ford and Chrysler applications, possible causes include a faulty Transmission Range Sensor, damaged sensor wiring, corroded connectors, or misadjusted shift linkage.
For GM applications, causes may involve a failing Torque Converter Clutch solenoid, damaged wiring, low or degraded transmission fluid, or a failing torque converter.
Symptoms Associated With P1702
Symptoms vary widely depending on the underlying system fault and the vehicle manufacturer.
On applications with a TRS intermittent fault, symptoms can include harsh shifting, an erratic gear display on the dash, or a no-start condition if the module cannot verify the transmission is in Park or Neutral.
On applications with a TCC intermittent or slipping fault, symptoms may include torque converter shudder, transmission overheating, slipping gears, or poor fuel economy.
Diagnosing the P1702 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year.
For TRS applications, technicians inspect the shift linkage for proper adjustment, test the sensor resistance and voltage, and check the wiring harness for intermittent opens or shorts.
For TCC applications, technicians check the transmission fluid level and condition, test the solenoid circuit resistance, and monitor the TCC slip RPM using a scan tool.
Repairing the P1702 Issue
Repairs must follow confirmed diagnosis based on the specific vehicle application.
If a TRS or wiring fault is confirmed on a Ford or Chrysler application, the sensor must be replaced, the wiring repaired, or the shift linkage adjusted.
If a TCC solenoid or circuit fault is confirmed on a GM application, the solenoid must be replaced, the wiring repaired, or the transmission fluid and filter serviced.
Cost Considerations for P1702 Repairs
Repair costs depend entirely on the confirmed root cause, component accessibility, and local labor rates.
Replacing a Transmission Range Sensor or adjusting linkage may require minimal labor.
Conversely, replacing a Torque Converter Clutch solenoid requires dropping the transmission pan, while replacing a failing torque converter requires removing the transmission entirely.
Prevention Strategies for Future Occurrences
Some electrical failures cannot be reliably prevented.
For transmission applications, regular fluid and filter changes help keep the valve body and solenoids clean, which protects the TCC circuit and related components.
Inspecting exposed wiring harnesses and keeping shift linkage components clean can help prevent intermittent circuit faults.
Troubleshooting Tips and Best Practices
Never assume P1702 is a universal sensor or solenoid code. Always verify the exact definition for the specific vehicle before purchasing parts.
Do not ignore related codes. A TRS fault may appear alongside other gear position codes, while a TCC fault may appear alongside other transmission slip or solenoid codes.
Check the transmission fluid level and condition first, as low or burnt fluid can cause intermittent solenoid operation and slipping.
More OBD-II Codes
| P1701 | P1703 | P0700 | P1711 |
| P1695 | P1704 | P0715 | P1712 |
| P1694 | P1705 | P0720 | P1713 |
| P1693 | P1706 | P0730 | P1714 |
| P1692 | P1707 | P0740 | P1715 |
| P1691 | P1708 | P0750 | P1716 |
Frequently Asked Questions
Is P1702 a generic or manufacturer-specific code?
No. P1702 is a manufacturer-specific code. Its exact definition varies significantly between automakers, so the factory service information for the specific vehicle must be consulted.
Can I drive my car with a P1702 code?
It depends on the application. If P1702 indicates a TCC slipping fault or a TRS failure, the transmission may overheat, slip, or prevent the engine from starting.
Will disconnecting the battery clear the P1702 code?
Disconnecting the battery may temporarily clear the code, but it does not repair the underlying mechanical or electrical fault. The code will return once the module runs its self-test.
Can low transmission fluid cause a P1702 code?
On applications monitoring the Torque Converter Clutch, low or degraded transmission fluid can prevent the solenoid from applying proper pressure, triggering an intermittent or slipping fault code.
Does P1702 always mean the sensor or solenoid is bad?
No. While a failed sensor or solenoid is a frequent cause, the code can also indicate damaged wiring, misadjusted shift linkage, or low transmission fluid on other vehicles.
What Should You Do About the P1702 Code?
Confirm the exact factory definition and diagnostic procedure for your specific vehicle application. Because P1702 is manufacturer-specific, identifying whether it relates to a Transmission Range Sensor or a Torque Converter Clutch is mandatory.
Follow the applicable manufacturer diagnostic steps to test the relevant system and components. Once the root cause is confirmed, complete the necessary repairs and verify that the system operates correctly and the code does not return.
