This code indicates that the engine computer is receiving an unstable or intermittently disconnecting signal from the barometric pressure sensor, which measures atmospheric pressure. Because the engine uses this data to adjust fuel delivery based on altitude and air density, an erratic signal can disrupt the air-fuel mixture. The issue is almost always related to wiring, connectors, or the sensor itself rather than a computer failure.
Corroded, loose, or chafed wiring and connectors are the most common cause of intermittent or erratic sensor signals.
The sensor itself may have an internal failure causing its signal to drop out or spike erratically.
Many vehicles use the MAP sensor for barometric readings; a vacuum leak can cause erratic pressure fluctuations that mimic a sensor failure.
A loose or corroded engine or sensor ground connection can cause the sensor's signal to fluctuate irregularly.
Extremely rare, but an internal fault in the engine computer could potentially misinterpret or fail to process the sensor signal correctly.
No, it is highly unlikely. Drivers are sometimes mistakenly told to replace the PCM for this code, but the actual cause is almost always a wiring issue, a poor connection, or a faulty sensor.
You can drive short distances, but engine performance and fuel economy may suffer. Prolonged driving with an incorrect air-fuel mixture can potentially damage the catalytic converter.
It depends on the vehicle. Some have a standalone sensor mounted on the firewall or intake, while many modern vehicles use the Manifold Absolute Pressure (MAP) sensor to read barometric pressure at key-on before the engine starts.
Yes. If your vehicle uses the MAP sensor to determine barometric pressure, a vacuum leak can cause erratic pressure readings that set this code.