U3521 Chrysler Tc OBD Code

OBD/2 U3521 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

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.

U3521 Chrysler Tc Error Code Repair Process :

If your variable cam timing solenoid #1 circuit malfunction 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 U3521 and engine control unit are in charge of monitoring a bunch of different variable cam timing solenoid #1 circuit malfunction, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Chrysler Tc 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 ;

Dirty Oil
Exhaust gas leaks
Incorrect Positive Crankcase Ventilation (PCV) hose connection
Exhaust tube

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 Tc OBD Code

U3521 Chrysler Tc Error Code Repair Process :

Common Causes of Chrysler Tc U3521 OBD2 Code

U3521 code for other Chrysler cars