The OBD-II (On-Board Diagnostics II) system is an essential part of modern cars as it helps to identify and rectify issues with the car’s performance. Through the use of a diagnostic scanner, the OBD-II system generates trouble codes that are used to identify issues with various parts of the car. OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio is one such code that indicates a problem with the transfer case of the vehicle.
The transfer case in a vehicle is responsible for transferring power from the transmission to the drivetrain. In four-wheel-drive vehicles, the transfer case is used to distribute power to the front and rear wheels. OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio is an indication that the transfer case is not functioning correctly.
What does OBD-II Code P279A mean?
OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio is generated when there is a mismatch between the actual ratio of the transfer case and the expected ratio. The transfer case is designed to maintain a specific ratio of power distribution between the front and rear wheels. A transfer case that is functioning correctly will maintain this ratio while driving. However, if the transfer case is not working correctly, the ratio will be incorrect, leading to the generation of Code P279A.
What causes OBD-II Code P279A?
Several issues can cause OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio. Some of the most common causes include:
1. Faulty transfer case motor – The transfer case motor is responsible for engaging/disengaging the transfer case, and if it’s faulty, it can lead to an incorrect gear ratio.
2. Worn transfer case gears – Over time, the transfer case gears can wear out, leading to a mismatch between the actual and expected gear ratios.
3. Failed transfer case sensor – The transfer case sensor is responsible for monitoring the transfer case gear ratio. If it fails, it can cause an incorrect gear ratio, leading to Code P279A.
4. Damaged transfer case actuator – The transfer case actuator controls the position of the transfer case gear. If it’s damaged, it can lead to an incorrect gear ratio.
How to diagnose OBD-II Code P279A?
Diagnosing OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio requires the use of a diagnostic scanner. The scanner will read the code and provide additional information about the specific issue that’s causing the code to be generated. Once the code has been identified, a mechanic will perform the following tests:
1. Test transfer case motor – The transfer case motor will be tested to verify it’s functioning correctly. If it’s not, it will be replaced.
2. Inspect transfer case gears – The transfer case gears will be inspected for wear and damage. If they’re worn, they will be replaced.
3. Test transfer case sensor – The transfer case sensor will be tested to verify it’s functioning correctly. If it’s not, it will be replaced.
4. Inspect transfer case actuator – The transfer case actuator will be inspected for damage. If it’s damaged, it will be replaced.
How to repair OBD-II Code P279A?
The repair of OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio will depend on the specific issue that’s causing the code to be generated. If the transfer case motor is faulty, it will be replaced. If the transfer case gears are worn, they will be replaced. If the transfer case sensor is faulty, it will be replaced. If the transfer case actuator is damaged, it will be replaced.
In some cases, the transfer case may need to be rebuilt or replaced entirely. This will depend on the extent of the damage to the transfer case.
Frequently Asked Questions:
1. Can I still drive my car if OBD-II Code P279A is generated?
It’s not recommended to drive the car if Code P279A is generated. This code indicates a problem with the transfer case, which is an essential part of the drivetrain. Continuing to drive the car can cause further damage and lead to more expensive repairs.
2. Can I fix OBD-II Code P279A myself?
Fixing Code P279A requires specialized knowledge and tools. It’s recommended to take the car to a professional mechanic to diagnose and repair the issue.
3. How much does it cost to repair OBD-II Code P279A?
The cost of repairing Code P279A will depend on the specific issue that’s causing the code to be generated. The cost can range from a few hundred dollars to several thousand dollars if the transfer case needs to be replaced entirely.
4. Can OBD-II Code P279A be prevented?
Regular maintenance of the transfer case can help prevent issues that lead to Code P279A. Additionally, driving the car carefully and avoiding harsh driving can help reduce wear and tear on the transfer case.
5. How long does it take to repair OBD-II Code P279A?
The time it takes to repair Code P279A will depend on the specific issue that’s causing the code to be generated. Minor issues can be fixed within a few hours, while more significant issues can take several days to repair.
Conclusion:
OBD-II Code P279A – Transfer Case Gear High Incorrect Ratio is an indication that the transfer case is not functioning correctly. Several issues can cause this code to be generated, including a faulty transfer case motor, worn transfer case gears, a failed transfer case sensor, or damaged transfer case actuator. Diagnosing and repairing this issue requires specialized knowledge and tools and should be done by a professional mechanic. Regular maintenance of the transfer case can help prevent issues that lead to Code P279A.