Intake Manifold Pressure Sensor Circuit Low Voltage
This code indicates the intake manifold pressure sensor is sending a low voltage signal.
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 engine control module (ECM) expects the intake manifold pressure sensor to send a voltage between 0.5V and 4.5V based on the engine's load, but it's detecting a voltage below 0.5V, suggesting a problem with the sensor or its wiring.
What the computer is actually seeing
The ECM monitors the voltage from the intake manifold pressure sensor. It uses this information to adjust the fuel mixture and ignition timing for optimal engine performance. If the voltage is consistently low, it triggers this fault code.
What a healthy reading looks like
Intake manifold pressure sensor voltage should typically range from 0.5V (low pressure) to 4.5V (high pressure) when the engine runs. At idle, expect around 1.0V to 2.0V.
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.
- 11. Check the vehicle's wiring and connectors to the intake manifold pressure sensor for any signs of wear, damage, or corrosion. Did you find any issues? If yes, repair/replace as necessary. If no, continue to step 2.
- 22. Measure the voltage at the intake manifold pressure sensor connector with the key in the ON position but engine off. Is the voltage below 0.5V? If yes, consider replacing the sensor. If no, proceed to step 3.
- 33. Start the engine and monitor the voltage at the intake manifold pressure sensor connector. Is the voltage still abnormal (below 0.5V)? If yes, test the wiring back to the ECM for short circuits. If wiring is fine, suspect a faulty ECM.
Common causes
- Faulty intake manifold pressure sensor
- Wiring issues (shorts to ground or open circuits)
- Connector corrosion or damage
- Vacuum leaks affecting pressure readings
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this soon as it can affect engine performance and fuel economy.
Will this code come back after I reset it?
Yes, if the underlying issue isn't fixed, the code will return.
Why does this code pair with SPN 2905 and SPN 2906?
These codes relate to pressure and sensor faults in the intake manifold system, indicating related issues.
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