The P279C: Transfer Case Gear Neutral Incorrect Ratio refers to an issue where the ratio in the transfer case gear in neutral is not within the expected parameters. This can be due to a faulty gear, malfunctioning sensors, or problems with the control module. Such an issue could prevent proper engagement of neutral gear, potentially affecting drivetrain operation and safe vehicle handling.
P279C – Quick Overview
| Code | Information |
|---|---|
| Meaning | P279C: Transfer Case Gear Neutral Incorrect Ratio |
| Is it serious? | Yes, if not addressed, this issue could lead to improper transfer case function, making it difficult to safely control or tow the vehicle. |
| Possible causes | – Incorrect ratio in transfer case gear neutral – Faulty transfer case gear or sensors – Control module issues |
| How to diagnose? | – Check the transfer case gear neutral ratio – Inspect transfer case gear and sensors – Verify control module functionality – Replace faulty gears or components as needed |
P279C Meaning
The P279C: Transfer Case Gear Neutral Incorrect Ratio code signals that the gear ratio in the neutral position of the transfer case is not matching the expected specification. This usually indicates problems within the transfer case mechanism itself, faulty sensors providing incorrect data, or control module malfunctions. Such a discrepancy can impact the vehicle’s ability to shift properly into neutral, affecting both drivability and safety.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other related codes. Additional codes may provide further context regarding the issue. | OBD-II Scanner |
| Inspect Transfer Case Gear | Visually inspect the transfer case for damage, wear, or misalignment when in the neutral position. | Flashlight, Safety Gloves |
| Check Gear Ratio | Use a diagnostic tool to measure the gear ratio in the transfer case neutral mode and compare it to manufacturer specifications. | Diagnostic Tool, Service Manual |
| Inspect Sensors | Test the sensors associated with the transfer case to ensure they are reading correctly and not providing inaccurate data. | Multimeter, Diagnostic Tool |
| Verify Control Module | Check the functionality of the transfer case control module, including electrical connections and software updates. | Multimeter, OBD-II Scanner |
| Replace Faulty Components | Replace any faulty gears, sensors, or control module components found during testing. | Wrench Set, Replacement Parts |
| Clear the Code and Test Drive | Clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue has been properly resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to confirm the P279C code has not reappeared. If it returns, further investigation is needed. | OBD-II Scanner |
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