How to read your car’s transmission codes

## How to Read Your Car’s Transmission Codes

### Understanding Transmission Codes

Transmission codes are diagnostic codes that indicate a problem with your vehicle’s transmission. These codes can help you identify the source of the issue and take appropriate action to resolve it.

Transmission codes are typically made up of a letter followed by four digits. The letter indicates the system that is experiencing the problem, while the digits provide more specific information about the fault. Here’s a breakdown of the code format:


P: Powertrain
C: Chassis
B: Body
U: Network


First digit: Category of the fault
Second digit: Subcategory of the fault
Third and fourth digits: Specific fault code

### Reading Transmission Codes

There are several ways to read transmission codes:

1. Using an OBD-II Scanner:

OBD-II (On-Board Diagnostics) scanners are devices that plug into your car’s diagnostic port and retrieve diagnostic codes from the vehicle’s computer.
Connect the scanner to the port and turn on the scanner.
Select “Read Codes” or “Diagnostic Codes” from the menu.
The scanner will display a list of codes, including transmission codes.

2. Using a Code Reader:

Code readers are similar to OBD-II scanners, but they only read and display diagnostic codes.
Connect the code reader to your car’s diagnostic port and turn it on.
The device will display a list of codes, including transmission codes.

3. Checking the Engine Light Indicator:

Some vehicles may display transmission codes by flashing the engine light indicator a certain number of times.
Count the number of flashes and refer to your vehicle’s owner’s manual to decode the code.

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### Common Transmission Codes

Here are some of the most common transmission codes and their meanings:

Code: | Description:
P0700 | Transmission Control System Malfunction
P0705 | Transmission Range Sensor Circuit Malfunction
P0715 | Turbine Speed Sensor Circuit Malfunction
P0720 | Output Speed Sensor Circuit Malfunction
P0730 | Incorrect Gear Ratio
P0740 | Torque Converter Clutch Circuit Malfunction
P0750 | Shift Solenoid A Malfunction
P0755 | Shift Solenoid B Malfunction
P0760 | Shift Solenoid C Malfunction
P0765 | Shift Solenoid D Malfunction

### Troubleshooting Transmission Codes

Once you have read the transmission codes, you can start troubleshooting the issue. Here are some steps you should follow:

1. Identify the problem: Use the code description to determine the specific issue affecting your transmission.
2. Check for other symptoms: Look for any other symptoms that may be associated with the transmission problem, such as slipping gears, difficulty shifting, or grinding noises.
3. Inspect the transmission: Visually inspect the transmission for any leaks or damage.
4. Test the transmission: If possible, test the transmission to confirm the problem. Drive the vehicle and pay attention to any unusual behavior or noises.
5. Consult a mechanic: If you are unable to resolve the issue on your own, consult a qualified mechanic for diagnosis and repair.

### Tips for Reading Transmission Codes

Keep the diagnostic codes handy for reference when discussing the issue with a mechanic.
If you have multiple codes, address the most severe code first.
Refer to your vehicle’s owner’s manual for specific diagnostic code information and troubleshooting procedures.
If you are unsure about the meaning of a code, seek professional assistance.

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