Fault code P0704 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0704 – Clutch Switch Input Circuit Malfunction

P0704: Causes, signs and repairs

Error code P0704 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the clutch switch circuit in vehicles with manual transmission. This DTC P0704 indicates that the control unit is not receiving a proper signal from the clutch switch, which normally detects whether the clutch is depressed or not.

What can cause this error code?

Defective clutch switch
Damaged wiring to the clutch switch
Corroded or loose plug connections
Incorrectly adjusted clutch switch
Faulty fuse in the clutch circuit
Worn clutch pedal or linkage
Faulty earth connection
Defective engine control unit (rare)

What symptoms occur in parallel with fault code P0704?

Starting problems: The vehicle cannot be started, even if the clutch is depressed
Reversing problems: Reversing lights do not work properly
Cruise control failure: Cruise control system deactivates automatically
Check engine light: Continuous illumination in the dashboard
Unusual engine performance: Engine runs in emergency program with reduced power
Shifting problems: Difficult gear changes or unusual noises

How to fix the problem of error code P0704?

The repair requires a systematic diagnosis of the clutch switch system.
Replace the clutch switch: Remove the defective switch on the clutch pedal and replace it with a new one, then adjust it correctly and check its function
Repair wiring: Locate damaged cables to the clutch switch, insulate defective areas and replace with new cables or repair
Clean plug connections: Clean corroded contacts on the clutch switch plug, treat with contact spray and connect firmly
Readjust the switch: Correct the position of the clutch switch on the pedal so that it is properly activated when the clutch is depressed
Check and replace fuses: Locate relevant fuses in the fuse box, replace defective ones and check circuit for further damage
Program the engine control unit: After repair, reset the control unit and have new software installed if necessary

FAQ - Frequently asked questions about DTC P0704

Can I continue driving with error code P0704?

It is possible to continue driving, but not recommended. The engine often runs in the emergency running program with reduced power, and important safety functions such as start protection may be impaired.

How much does it cost to repair error code P0704?

The costs vary depending on the cause: a new clutch switch costs 20-80 euros, working time around 50-150 euros. For more complex wiring problems, the costs can rise to 200-400 euros.

How can I diagnose fault code P0704 myself?

Read out the code with an OBD scanner, then check the function of the clutch switch with a multimeter. The switch should send a signal when the clutch pedal is depressed.

Is the error code P0704 the same for all manufacturers?

Yes, P0704 is a standardized OBD-II code. However, the specific repair procedures and switch types may vary depending on the vehicle manufacturer.

Can a faulty clutch switch affect other systems?

Yes, the clutch switch affects starting, reverse light and cruise control systems. A defect can disrupt several vehicle functions at the same time.

How often does fault code P0704 occur?

P0704 is a relatively common fault code, especially in older vehicles with high mileage, as the clutch switch wears out due to frequent use.

Vehicles in which fault code P0704 occurs most frequently

Fault code P0704 is a standardized OBD-II trouble code that indicates problems with the clutch switch circuit and can occur in all vehicles with manual transmissions, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Transit (2000-2015)
Volkswagen: Golf, Polo, Passat, Caddy (1998-2020)
Opel: Astra, Corsa, Vectra, Zafira (2000-2018)
Peugeot: 206, 207, 307, 308, Partner (2001-2016)
Renault: Clio, Megane, Scenic, Kangoo (1999-2017)
Citroën: C3, C4, Berlingo, Xsara (2002-2015)
Fiat: Punto, Panda, Doblo, Stilo (2001-2014)
BMW: 3 Series, 1 Series (E87, E90, E91) (2004-2013)

If code P0704 occurs in your vehicle, you should first have the clutch switch and its wiring checked. As this EOBD error code can impair driving safety, it is advisable to have it repaired promptly at a specialist workshop. Most problems can be rectified inexpensively by replacing the clutch switch or repairing the wiring.

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