U2171 Citroen B2 OBD Code

OBD/2 U2171 error code description and symptoms.

Mass Air Flow (MAF) Sensor Intermittent The MAF sensor circuit is monitored by the PCM for sudden voltage (or air flow) input change through the comprehensive component monitor (CCM). If during the last 40 warm-up cycles in key ON engine running the PCM detects a voltage (or air flow) change beyond the minimum or maximum calibrated limit, a continuous memory diagnostic trouble code (DTC) is stored.

Circuit High Input codes like U2171 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.

U2171 Citroen B2 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U2171 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 blower (fan) circuit short to vbatt 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 blower (fan) circuit short to vbatt.

Common Causes of Citroen B2 U2171 OBD2 Code

A common cause of code U2171 is the failure of Blower (Fan) Circuit Short to Vbatt, but there are several other possible causes as well, such as ;

Damaged camshaft position (CMP) sensor
Exhaust gas leaks
Faulty variable valve timing (VVT)
Oil Control Valve (OCV) circuit is open or shorted

U2171 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U2171 Citroen B2 OBD Code

U2171 Citroen B2 Error Code Repair Process :

Common Causes of Citroen B2 U2171 OBD2 Code

U2171 code for other Citroen cars