U3521 Chrysler Airflow OBD Code

OBD/2 U3521 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

Circuit High Input codes like U3521 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.

U3521 Chrysler Airflow Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U3521 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 variable cam timing solenoid #1 circuit malfunction 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 variable cam timing solenoid #1 circuit malfunction.

Common Causes of Chrysler Airflow U3521 OBD2 Code

A common cause of code U3521 is the failure of Variable Cam Timing Solenoid #1 Circuit Malfunction, but there are several other possible causes as well, such as ;

Exhaust tube
Erratic camshaft position due to low oil pressure
Clogged or faulty fuel injector (s)
Incorrect fuel filler cap used

U3521 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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U3521 Chrysler Airflow OBD Code

U3521 Chrysler Airflow Error Code Repair Process :

Common Causes of Chrysler Airflow U3521 OBD2 Code

U3521 code for other Chrysler cars