C20A4 Audi A7 OBD Code

OBD/2 C20A4 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 C20A4. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for C20A4

Circuit High Input codes like C20A4 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.

C20A4 Audi A7 Error Code Repair Process :

If your manifold absolute temperature circuit high input 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 C20A4 and engine control unit are in charge of monitoring a bunch of different manifold absolute temperature circuit high input, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Audi A7 C20A4 OBD2 Code

A common cause of code C20A4 is the failure of Manifold Absolute Temperature Circuit High Input, but there are several other possible causes as well, such as ;

EVAP system hose leaking
Faulty oil control valve (OCV)
Failures of clutch motion/travel sensors.
Three way catalyst converter Bank 1

C20A4 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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C20A4 Audi A7 OBD Code

C20A4 Audi A7 Error Code Repair Process :

Common Causes of Audi A7 C20A4 OBD2 Code

C20A4 code for other Audi cars