Code P2260 indicates that the engine computer has detected an abnormally high voltage in the control circuit for the secondary air injection system (Bank 2 / Circuit B). This typically points to an electrical short to power or an internally shorted component preventing the circuit from functioning correctly.
The valve can short internally, causing a high voltage condition on the control circuit back to the PCM.
Chafed, melted, or damaged wiring can contact a power source, sending excessive voltage through the control circuit.
A stuck closed or internally shorted relay can feed continuous power into the control circuit, triggering the high voltage code.
Corrosion or bent pins in the valve connector can bridge power and signal circuits, resulting in a false high voltage reading.
An internal failure within the PCM is extremely rare and should only be considered after all wiring and components are verified.
You can drive it cautiously, but the vehicle may run poorly on cold starts. Prolonged driving with a malfunctioning secondary air system can damage the catalytic converter and will result in a failed emissions test.
No, replacing the PCM for this code is almost always a misdiagnosis. The high voltage condition is nearly always caused by a shorted secondary air injection valve, a faulty relay, or a wiring issue.
The 'B' typically refers to the Bank 2 side of the engine (the side opposite cylinder number one), though it can occasionally refer to a specific secondary valve or circuit depending on the manufacturer.
If the circuit is stuck high, the air injection valve may stay open continuously. This dumps unmetered air into the exhaust during cold starts, causing an extremely lean mixture, rough running, or stalling.