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.
Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code B2984, so consult the manual to locate the brake fluid reservoir. Bear in mind that a low fluid level can set code B2984 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.
Difficulty Level (Soso)
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Repair Time (50 Min.)
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| Cost Prediction : $ 50-100 |
OBD B2984 code and tailpipe testing are two different approaches to identify vehicles in need of repair. The OBD system looks for broken or malfunctioning emissions control components and cruise control on signal malfunction, while tailpipe tests sample a vehicle's exhaust to see if it is above or below certain prescribed limits. Given the robust nature of today's emissions control components, it is entirely possible for an individual component to B2984 malfunction without leading to an immediate increase in emissions at the tailpipe. In such cases, other components (like the catalyst) can temporarily compensate for the part that is broken however, these other components can only do double duty for so long before they, too, begin to malfunction. In addition, OBD also monitors for B2984 and other malfunctions in the fuel system problems that traditional tailpipe tests were not designed to identify. Most state and local areas also include a gas cap pressure test as part of an emission inspection.
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B2984 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. |
You can view according B2984 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +B2984 Citroen Ds4 | +B2984 Chevrolet Corsa | +B2984 Mitsubishi A10 | +B2984 Tvr 2500 | +B2984 Opel Astra G |
Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.
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