Fault code P1297 – a step-by-step guide to diagnosing and fixing it

Error code P1297 is displayed and the check engine light is on - what does this mean?

The DTC P1297 is a manufacturer-specific fault code that is recognized by the OBD system and usually indicates a problem with the cylinder deactivation or variable valve timing system. This fault code mainly occurs on Honda and Acura vehicles, where it indicates a malfunction in the VTEC (Variable Valve Timing and Lift Electronic Control) system. The EOBD system registers this trouble code when the valve timing electronic control system is not functioning properly.

What can cause this error code?

• Defective VTEC oil pressure switch
• Clogged or dirty VTEC oil filter
• Low engine oil level or low-quality engine oil
• Damaged VTEC control valve (solenoid)
• Defective wiring to the VTEC system
• Loose or corroded plug connections
• Mechanical wear of the VTEC components
• Blocked oil ducts in the cylinder head
• Defective engine control unit (ECU)

What symptoms occur in parallel with fault code P1297?

• Loss of power: The vehicle shows significantly reduced engine power, especially at higher engine speeds. Uneven engine running: The engine runs unevenly and may jerk when idling or under load. Increased fuel consumption: The vehicle requires more fuel than usual due to inefficient combustion. Engine noise: Unusual rattling or knocking noises from the engine compartment, especially when accelerating. Poor throttle response: Delayed response when pressing the accelerator pedal and sluggish acceleration.

How can the problem with error code P1297 be rectified?

• Repairing the P1297 code requires a systematic approach to diagnosing and fixing VTEC system faults.
• Replace the VTEC oil pressure switch: Locate the faulty oil pressure switch on the cylinder head, remove it and replace it with a new original part, replacing the gasket in the process
• Change engine oil and filter: Carry out a complete oil change with high-quality engine oil of the correct viscosity and install a new oil filter
• Replace the VTEC solenoid: Dismantle the VTEC control valve on the cylinder head, clean it or replace it completely if it is defective
• Check electrical connections: Inspect all cables and connectors to the VTEC system for damage and repair or replace defective components
• Clean the oil ducts: Dismantle the cylinder head and professionally flush the VTEC oil ducts and remove any deposits
• Carry out ECU diagnostics: Test the engine control unit with professional diagnostic software and have it repaired or replaced if defective