C3171 BMW Fault Code

Description:

Vehicle Speed Sensor (VSS) Intermittent Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). This DTC is set the same way as C3171. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for C3171

C3171 Code Symptoms :

There are currently two main types of cylinder deactivation used today, depending on the type of engine. C3171 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

Diagnosis And Repairing C3171

C3171 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 C3171 code ?

• Clogged or faulty fuel injector (s)
• EVAP system hose leaking
• Faulty TCM or TCM programming
• Improper ignition timing

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C3171, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code C3171 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.