B3986 Fiat 850 OBD Code

OBD/2 B3986 error code description and symptoms.

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 B3986. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for B3986

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

B3986 Fiat 850 Error Code Repair Process :

The rule of B3986 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of wiper wash/delay switch circuit failure. Likewise, overriding the OBD B3986 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Fiat 850 B3986 OBD2 Code

A common cause of code B3986 is the failure of Wiper Wash/Delay Switch Circuit Failure, but there are several other possible causes as well, such as ;

EVAP system hose leaking
Faulty Crankshaft Position Sensor (POS)
Faulty Variable Camshaft Timing (VCT) position solenoid
Fuel filler cap remains open or fails to close

B3986 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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B3986 Fiat 850 OBD Code

B3986 Fiat 850 Error Code Repair Process :

Common Causes of Fiat 850 B3986 OBD2 Code

B3986 code for other Fiat cars