B3681 Chevrolet Trailblazer OBD Code

OBD/2 B3681 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.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

B3681 Chevrolet Trailblazer Error Code Repair Process :

The scent may B3681 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such B3681, so if the inside of your car transmission transfer case counter clockwise shift relay coil open circuit as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Chevrolet Trailblazer B3681 OBD2 Code

A common cause of code B3681 is the failure of Transmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit, but there are several other possible causes as well, such as ;

Dirty Oil
Faulty select solenoid
Faulty Variable Camshaft Timing (VCT) position solenoid
Incorrect fuel filler cap used

B3681 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

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

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B3681 Chevrolet Trailblazer OBD Code

B3681 Chevrolet Trailblazer Error Code Repair Process :

Common Causes of Chevrolet Trailblazer B3681 OBD2 Code

B3681 code for other Chevrolet cars