U1271 BMW Fault Code

Description:

Intake Manifold Runner Control Malfunction (Stuck Open) The IMRC system is monitored for failure during continuous, key ON engine OFF or key ON engine running self-test. The test fails when the signal on the monitor pin is less than an expected calibrated range at closed throttle. IMRC monitor signal circuit shorted to BMW PWR GND or SIG RTN Damaged IMRC actuator Damaged PCM An IMRCM PID reading approximately near 1 volt at closed throttle may indicate a fault.

U1271 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine U1271 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the U1271!

Diagnosis And Repairing U1271

U1271 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to fix U1271 code ?

• EVAP canister or fuel tank leaks
• Faulty spark plug (s)
• Intake Valve Timing Control Solenoid Valve circuit poor electrical connection
• Radio frequency interference (RFI)

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code U1271, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code U1271 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.