P278B Fault Code

Kick Down Switch Circuit Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P278B fault code indicates an issue with the Kick Down Switch Circuit, which is responsible for signaling the transmission to downshift to a lower gear when more power is needed. This is a crucial component for maintaining performance during acceleration, especially when overtaking or climbing hills.

What are the symptoms of the P278B code?

Drivers may experience a lack of power during acceleration, difficulty in shifting gears, or the transmission failing to downshift when needed. Warning lights may illuminate on the dashboard, and the vehicle might feel sluggish or unresponsive under heavy acceleration.

What causes the P278B code?

Common causes of this code include a malfunctioning kick down switch, damaged wiring in the circuit, a faulty transmission control module (TCM), or issues with the vehicle's electrical system. Faulty connections or corrosion can also impede proper functioning, leading to performance not meeting expectations.

How to fix P278B?

To resolve the P278B code, first inspect the kick down switch and its connections for any signs of damage or corrosion. Replace the switch if necessary. Check the wiring for continuity and repair any damaged wires. If issues persist, the transmission control module may need to be tested or reprogrammed to ensure it communicates correctly with the vehicle's systems.