C0391 Volkswagen Concept OBD Code

OBD/2 C0391 error code description and symptoms.

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

Circuit High Input codes like C0391 are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that 'leak' current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a 'high input' code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

C0391 Volkswagen Concept Error Code Repair Process :

If your seatbelt driver pretensioner circuit resistance low on squib 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 C0391 and engine control unit are in charge of monitoring a bunch of different seatbelt driver pretensioner circuit resistance low on squib, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Volkswagen Concept C0391 OBD2 Code

A common cause of code C0391 is the failure of Seatbelt Driver Pretensioner Circuit Resistance Low on Squib, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty Intake Valve Timing Control Solenoid Valve
Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
Faulty Variable Camshaft Timing (VCT) position solenoid

C0391 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

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

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C0391 Volkswagen Concept OBD Code

C0391 Volkswagen Concept Error Code Repair Process :

Common Causes of Volkswagen Concept C0391 OBD2 Code

C0391 code for other Volkswagen cars