U1606 BMW Fault Code

Description:

The Transmission Range Sensor (also referred to as the PRNDL input an/or neutral safety switch) tells the transmission control module (TCM) an the engine control module (PCM) that the transmission is in park, reverse, neutral, drive, low, 2nd, 3rd etc. It is attached directly to the manual valve of transmission, so when the shift lever is moved from park to drive, the Transmission Range Sensor communicates this critical information to the above mentioned vehicle control module systems.

U1606 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine U1606 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 U1606!

Diagnosis And Repairing U1606

U1606 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 U1606 code ?

• Engine Control Module (ECM)
• Camshaft advance mechanism binding (VCT unit)
• Ignition misfiring
• Faulty Air Flow Meter

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code U1606, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code U1606 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.