- Check the battery voltage
- Inspect the circuit harness connector contacts
- Check the circuit wires for shorts
- Replace the Automatic Transmission Hydraulic Pressure Sensor 1
- Replace the Solenoid valves in the valve body
- Replace the Transmission Control Module (TCM)
When it comes to BMW vehicles, it’s important to know the codes in order to diagnose any problems. One of the most common codes is P0704, which stands for Clutch Switch Input Circuit Malfunction. This code can be triggered by a variety of issues, including corroded circuit harness connector contacts, circuit wires that have shorted to each other, to battery or ground, failing Automatic Transmission Hydraulic Pressure Sensor 1, faulty solenoid valves in the valve body, and a faulty Transmission Control Module (TCM). In order to troubleshoot the problem, it’s important to check the battery voltage, inspect the circuit harness connector contacts, check the circuit wires for shorts, replace the Automatic Transmission Hydraulic Pressure Sensor 1, replace the Solenoid valves in the valve body, and replace the Transmission Control Module (TCM).
Causes and Solutions for BMW Code P0704
| Causes | Solutions |
|:——:|:———:|
|Corroded circuit harness connector contacts|Check the battery voltage|
|Circuit wires have shorted|Inspect the circuit harness connector contacts|
|Automatic Transmission Hydraulic Pressure Sensor 1 has failed|Check the circuit wires for shorts|
|Solenoid valves in valve body are faulty|Replace the Automatic Transmission Hydraulic Pressure Sensor 1|
|Transmission Control Module (TCM) has failed|Replace the Solenoid valves in the valve body|
|Battery voltage is below 11.5v|Replace the Transmission Control Module (TCM)|
Checking the Battery Voltage
When it comes to BMW Code P0704, one of the first things to check is the battery voltage. If the battery voltage is below 11.5v, then it could be the cause of the problem. This can be tested by using a voltmeter.
Inspecting the Circuit Harness Connector Contacts
Another possible cause of BMW Code P0704 is corroded circuit harness connector contacts. This can be inspected by visually inspecting the connectors and testing them with a multimeter.
Checking the Circuit Wires for Shorts
The circuit wires can be checked for shorts by using a multimeter. This can help to identify if the wires are causing the problem.
Replacing the Automatic Transmission Hydraulic Pressure Sensor 1
If the Automatic Transmission Hydraulic Pressure Sensor 1 has failed, then it should be replaced. This is an important part of the system and should be replaced as soon as possible.
Replacing the Solenoid Valves in the Valve Body
If the solenoid valves in the valve body are faulty, then they should be replaced. This is a relatively simple process and can be done with the right tools.
Replacing the Transmission Control Module (TCM)
If the Transmission Control Module (TCM) has failed, then it should be replaced. This is a more complicated process and should only be done by a professional.
Conclusion
In conclusion, BMW Code P0704 can be caused by a variety of issues, including corroded circuit harness connector contacts, circuit wires that have shorted to each other, to battery or ground, failing Automatic Transmission Hydraulic Pressure Sensor 1, faulty solenoid valves in the valve body, and a faulty Transmission Control Module (TCM). To troubleshoot and fix this problem, it’s important to check the battery voltage, inspect the circuit harness connector contacts, check the circuit wires for shorts, replace the Automatic Transmission Hydraulic Pressure Sensor 1, replace the Solenoid valves in the valve body, and replace the Transmission Control Module (TCM). Fixing BMW Code P0704 requires a thorough understanding of the system and should only be done by a professional.
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