The P2779 OBD-II code indicates an issue with the downshift switch circuit performance in vehicles equipped with automatic transmissions. This code is triggered when the downshift switch fails to operate correctly, leading to the disabling of the TAP Shifting feature.
What Does the P2779 Code Mean?
The P2779 code refers to a malfunction in the downshift switch circuit. This switch allows drivers to manually select their desired gear while driving, commonly referred to as TAP Shifting. When the downshift switch does not perform as expected, the vehicle’s onboard diagnostic system registers this fault.
What Causes the P2779 Code?
Several factors can lead to the P2779 code being triggered, including:
- Body Control Module (BCM) failure
- Shift lever assembly failure
- Wiring issues
What Are the Symptoms of the P2779 Code?
When the P2779 code is present, the most notable symptom is the disabling of the TAP Shifting feature. This means you will be unable to manually shift gears while driving.
How Serious Is the P2779 Code?
The P2779 code is classified as an urgent issue. It requires immediate attention because it can lead to significant malfunctions in the vehicle. Ignoring this code could result in severe damage to the transmission or compromise driver and passenger safety.
How to Diagnose the P2779 Code
Diagnosing the P2779 code involves a systematic approach:
- Use an OBD-II scanner to confirm the presence of the P2779 code.
- Inspect the downshift switch and its wiring for any visible damage or disconnections.
- Check the Body Control Module (BCM) and shift lever assembly for proper function.
- Perform continuity tests to ensure that the circuit is functioning correctly.
Common Repairs for the P2779 Code
Repairs for the P2779 code may include:
- Replacing the downshift switch
- Repairing or replacing damaged wiring
- Replacing the Body Control Module (BCM)
- Fixing or replacing the shift lever assembly
How Much Does It Cost to Fix the P2779 Code?
The cost to repair the P2779 code can vary widely depending on the specific issue. On average, you may expect to spend between $100 and $800, which includes parts and labor costs. More complex issues, such as BCM replacement, may lead to higher expenses.
Can I Fix the P2779 Code Myself?
If you have experience with automotive repairs, you may be able to address the P2779 code yourself. However, it’s crucial to understand that simply replacing parts may not resolve the underlying issue. Proper diagnosis is essential to avoid unnecessary repairs. If you’re unsure, it’s advisable to consult a professional mechanic.
