Intake Manifold Pressure Sensor - Voltage Above Normal, Millivolts
Indicates a high voltage reading from the intake manifold pressure sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The intake manifold pressure sensor sends a voltage signal to the computer that reflects the pressure inside the manifold. If the voltage goes above a set range, the computer sees this as a problem and throws a fault code.
What the computer is actually seeing
The engine control unit (ECU) monitors the voltage from the intake manifold pressure sensor. It expects to see a voltage typically between 0.5V and 4.5V under normal operating conditions. If the voltage exceeds 4.5V, it triggers SPN 4137.
What a healthy reading looks like
Normal voltage range: 0.5V to 4.5V.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the wiring and connectors for the intake manifold pressure sensor for wear, corrosion, or loose connections. Fix any issues found.
- 2Using a multimeter, measure the voltage directly at the intake manifold pressure sensor while the engine is running. Record the voltage reading. Decision: Is the voltage above 4.5V?
- 3If the voltage is above 4.5V, disconnect the sensor and measure the voltage at the connector again to see if it drops. Decision: Is the voltage still above 4.5V with the sensor disconnected?
- 4If the voltage is normal with the sensor disconnected, replace the intake manifold pressure sensor. If it's still high, look for shorts in the wiring harness feeding the sensor.
Common causes
- Faulty intake manifold pressure sensor
- Wiring issues (short to voltage)
- Poor electrical connections at the sensor
- Engine vacuum leaks affecting sensor readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
It's best to get it fixed soon; drivability might be impacted.
What happens if I ignore this code?
Ignoring it could lead to performance issues and higher emissions.
Why does this code sometimes trigger with other codes?
It can pair with other codes if multiple sensors are affected or due to wiring issues.
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