P0704: OBD-2 error code interpretation and solutions

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Vehicle engine and/or automatic transmission

Code: P0704 - Clutch Switch Input Circuit

The error code P0704 means that the Engine Control Module (ECM) or Transmission Control Module (TCM) is not receiving the correct signal from the clutch switch. This switch tells the system whether the clutch pedal is pressed. If the signal is wrong or missing, this code appears.

The error usually happens in vehicles with manual transmissions and can affect engine starting, cruise control operation, and other functions.

Causes

Faulty clutch switch.
Broken or damaged wiring to the switch.
Poor contact or corrosion in the connectors.
Problem with the control module (rare).

Symptoms

Engine does not start without pressing the clutch pedal (or even when pressed).
Cruise control does not work or shuts off unexpectedly.
Check Engine light is on.
In some models, the transmission may behave incorrectly.

How to Diagnose

Connect an OBD-II scanner and read the error codes.
Visually inspect the clutch switch, its wiring, and connectors.
Use a multimeter to test if the switch changes its signal when pressing the clutch pedal.
Check the continuity between the switch and the control module.

How Serious Is It

This problem might not immediately affect driving safety, but:

You may have trouble starting the engine.
Cruise control may not work properly.
Ignoring the problem can lead to further electrical issues.

Repair

Replace the faulty clutch switch.
Clean or replace connectors if there is corrosion or poor contact.
Repair or replace damaged wiring.
Clear the code with a scanner and recheck if the error returns.

Conclusion

The P0704 code points to problems reading the clutch pedal position. Fixing it early is usually simple and inexpensive. Ignoring it could cause inconvenience or even make starting the car harder. It is recommended to perform diagnostics and repair as soon as possible.

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OBD P0704 code analysis and solutions

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DTC P0704