Turbocharger Engine Boost Condition - DTC Decoded: P1251
Turbocharger Engine Boost Condition – Limit Exceeded
Check Engine Light Illuminates on Dash and Code is Stored in ECM Bank
Turbo Solenoid Valve
What The Tech Says
More times than not, the problem that throws this code is with the turbo solenoid valve. Mounted on the driver’s side of the engine near the top, it is a small cylinder-shaped plastic unit. This valve also has two vacuum hoses and an electrical connector. This valve operates the wastegate for the turbo and when faulty, it will cause the turbo to over or undercharge. Replacement of this valve is almost always a remedy for this problem. Please note that you should always replace parts such as these with genuine Toyota parts to restore proper function.