What Is the P0704 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
Difficulty of Inspecting
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P0704 code stands for a “Clutch Switch Input Circuit Malfunction.” If this code is logged, then it means that the powertrain control module (PCM) detected a malfunction in the clutch switch input circuit. This error can only be found in manual cars since automatic transmission vehicles do not have a clutch switch.
What Brands Will This Code Cover?
If your vehicle is OBD-II compatible and has a manual transmission, then you will be able to see this error. This includes brands such as:
- Ford
- Honda
- Mazda
- Mercedes
- Volkswagen
More About the P0704 Code
The P0704 code refers to a problem related to the clutch switch.
The clutch links the engine to the transmission. It has a rod connected to the foot pedal. By default, this rod pushes the plunger of a hydraulic clutch master cylinder. This engages the clutch pressure plate, connecting the engine to the transmission. When you step on the foot pedal, the rod is moved, and the transmission is disconnected from the engine.
The clutch is important for safety. It prevents you from starting the vehicle unless you step on the clutch pedal. By default, the clutch prevents the ignition switch from being activated.
The PCM also uses the clutch switch as a signal to monitor other parts of the vehicle. Whether or not the clutch switch is activated can provide valuable information about stopping, starting, and automated brakes.
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What Are the Symptoms of a P0704 Code?
Some of the common symptoms of a P0704 code include the following:
- Vehicle will not start
- Engine is intermittent or keeps turning off
- Unable to control traction
- Increased fuel consumption
- Affected safety functions
What Are Some Causes of a P0704 Code?
The most common cause of a P0704 code is a faulty clutch switch. However, this code can also be caused by the following:
- Worn clutch pedal lever
- Blown fuse
- Blown fusible link
- Shorted wiring and or connectors in the clutch switch circuit
- PCM error
How Serious Is the P0704 Code?
A P0704 Code is considered urgent. The clutch affects your car’s drivability. But it also is a safety concern, as it can affect your traction control. Be sure to address this code before attempting to drive your vehicle. When necessary, be sure to consult a professional to fix your vehicle.
Can I Still Drive with a P0704 Code?
It is not recommended to drive a vehicle with a P0704 code. Because it affects how you control your vehicle, it is dangerous to drive with a P0704 code. This code is considered urgent and should be addressed before you attempt to drive your vehicle.
How Easy Is It to Diagnose a P0704 Code?
You can try to diagnose a P0704 code by yourself. This will involve checking if the clutch switch circuit is functional. However, this error can also be caused by the PCM; this is less common. If this is the case, then you will need to consult a professional to get your PCM repaired or replaced.
To diagnose this error, you will need to check a technical service bulletin or TSB. You will also need basic diagnostic tools, like a scanner, a digital volt/ohmmeter, a transmission gauge, and your vehicle service manual.
How Difficult Is It to Inspect a P0704 Code?
Inspecting a P0704 code can be difficult, especially if you do not have previous experience. What makes this error hard for beginners to inspect is the amount of detail that comes into its inspection.
Inspecting a P0704 code will entail inspecting the clutch switch circuit wiring, the battery cables, and the battery itself. You may even need to have the battery replaced.
If the code is intermittent, then you will need to determine if there is a voltage on the input and output circuit of the clutch switch. This can be tricky as some models will have multiple clutch switches. You will need to make sure that you have the correct service manual to check every switch.
Aside from inspecting the wiring and circuits, you will need to inspect the clutch switch itself. You will need to make sure that the clutch pivot lever and the pedal arm need replacing.
Because of the amount of detail that goes into this error, it can be easy to miss a reason why this error occurred in the first place.
Need Additional Help with Your P0704 Code?
A P0704 code is an urgent code. If you want to know more about this code and other codes, then check out the OBD-II database.
Because of how serious and complicated this code can be to diagnose, it is recommended to contact a professional. Find a repair shop in your area to properly diagnose the problem.
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