The 2019 Honda Fit uses a 1.5L i-VTEC four-cylinder engine. When P1259 appears, the engine computer has detected a problem with the VTEC system that varies valve timing and lift for optimal performance. Here's what causes this code and how to address it.
How VTEC Works in the Fit
VTEC (Variable Valve Timing and Lift Electronic Control) allows the engine to operate with different cam profiles for efficiency at low RPM and performance at high RPM. At a certain RPM threshold, oil pressure activates a mechanism that switches cam profiles, providing more aggressive valve timing and lift.
When VTEC engages, you may notice a subtle change in engine sound and increased power. If the system isn't working, the engine operates on the economy cam profile at all RPMs, reducing high-RPM performance.
P1259 Causes
Low oil level or pressure is the most common cause. VTEC activation requires sufficient oil pressure to move the switching mechanism. If oil is low or the oil pump is weak, VTEC cannot engage reliably. Check and correct oil level first.
Contaminated oil can clog the VTEC solenoid screen. The solenoid has a small screen that filters oil going to the VTEC mechanism. Sludge or debris can block this screen, preventing adequate oil flow. The solenoid is accessible and can be cleaned or replaced.
The VTEC solenoid itself can fail electrically. The solenoid is an electro-mechanical valve controlled by the ECU. Internal failures prevent proper oil flow control. Testing solenoid resistance and operation identifies electrical failures.
VTEC pressure switch faults trigger P1259. The pressure switch monitors oil pressure to the VTEC mechanism and signals when pressure is adequate. A faulty switch may report incorrect pressure readings.
Diagnosis Steps
Check oil level and condition—if low, top off and clear codes. If oil is dirty, change oil and filter. Inspect the VTEC solenoid for contamination. Test solenoid electrically for proper resistance. Check VTEC pressure switch operation. If basics are good, monitor oil pressure with a gauge to verify adequate system pressure.