The Camshaft Position sensor will signal the Engine Control Module when the #1 cylinder is ready for the spark plug to fire (top-dead-center on compression stroke). The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.
Circuit High Input codes like B2901 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.
Difficulty Level (Easy)
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Repair Time (45 Min.)
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| Cost Prediction : $ 80-120 |
If your warm up catalyst efficiency below threshold (bank 1) 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 B2901 and engine control unit are in charge of monitoring a bunch of different warm up catalyst efficiency below threshold (bank 1), and if they get a reading that's a little out of whack, up pops the check engine light.
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B2901 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 B2901 DTC for your car model. We selected several models to see obd2 solutions click and view it.
| +B2901 Holden Combo | +B2901 Peugeot Sesame | +B2901 Pininfarina Rossa | +B2901 Ferrari 410 | +B2901 Falcon 515 |
Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.
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