U3438 BMW Fault Code

Description:

The Camshaft Position sensor will signal the Engine Control Module when the #1 cylinder is ready for the spark plug to fire (top-dead-center on compression stroke).

The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.

U3438 Code Symptoms :

If your U3438 check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U3438 and engine control unit are in charge of monitoring a bunch of different , and if they get a reading that's a little out of whack, up pops the check engine light.

Diagnosis And Repairing U3438

U3438 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 U3438 code ?

• Exhaust gas leaks
• Camshaft advance mechanism binding (VCT unit)
• Fuel tank leaking
• Air fuel ratio (A/F) Sensor 1 Bank 1 circuit poor electrical connection

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code U3438, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code U3438 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.