Powertrain Fuel & Air medium

P0107 Code — MAP/Barometric Pressure Circuit Low Input (Causes & How to Fix)

Fix OBD-II code P0107: MAP/Barometric Pressure Circuit Low Input. Step-by-step diagnosis and repair guide.

⏱️ Time30-60 minutes
📋 Severitymedium
🚗 Applies ToToyota, Honda, Ford, Chevrolet
⚠️ DTC CodeP0107
P0107 — Powertrain Fuel & Air diagnostic guide

What Does DTC P0107 Mean?

P0107 on your Powertrain Fuel & Air system means: The engine control module is seeing a voltage that is lower than the minimum it expects from the MAP (Manifold Absolute Pressure) sensor. This usually means the sensor, its wiring, or the sensor’s reference voltage is compromised, causing the PCM to receive inaccurate pressure data.

How to Diagnose and Fix P0107 — Step by Step

  1. 1

    Visual Inspection – Loose Cap, Connector, and Wiring

    1. Open the hood and locate the MAP sensor (usually on or near the intake manifold). 2. Verify the gas cap is tightened to the proper torque; a loose cap can create a vacuum leak that fools the MAP sensor. 3. Inspect the sensor’s electrical connector for corrosion, bent pins, or a loose clip. 4. Follow the wiring harness back toward the PCM and look for chafed insulation, cracked clips, or burnt spots. 5. Re‑seat the connector and, if you see any damaged wires, repair or replace them before moving on.

  2. 2

    Live Data Scan – Check MAP Voltage

    1. Plug an OBD‑II scanner that can display live data into the vehicle’s diagnostic port. 2. Select the MAP sensor PID (usually labeled “MAP” or “Barometric Pressure”). 3. With the engine at idle (≈750 rpm) and the vehicle at sea‑level pressure, the MAP voltage should sit roughly between 2.0 V and 3.0 V. 4. Compare the live reading to the expected range. If the voltage is consistently below 0.5 V, the circuit is reading “low input.” 5. Note any fluctuations when you gently tap the sensor or wiggle the connector—spikes indicate a loose connection.

  3. 3

    Multimeter Test – Sensor Ground and Reference Voltage

    1. Disconnect the MAP sensor connector. 2. Set a digital multimeter to DC voltage. 3. Back‑probe the sensor’s reference wire (usually 5 V) while the ignition is ON. A healthy reference should read close to 5 V (+/‑0.2 V). 4. Switch the meter to continuity mode and place the probes on the sensor ground terminal and chassis ground; you should hear a beep, confirming a solid ground path. 5. If the reference voltage is missing or the ground shows high resistance, the problem lies in the wiring or PCM supply rather than the sensor itself.

  4. 4

    Vacuum Leak Check – Hose and Intake Inspection

    1. Locate the vacuum hose that feeds the MAP sensor (often a small rubber tube). 2. With the engine running, listen for hissing sounds using a length of hose or a piece of rubber tubing placed over each connection. 3. Spray a short burst of carburetor cleaner on each hose and the sensor’s mounting surface; a change in idle speed indicates a leak. 4. Replace cracked hoses or reseat the sensor’s mounting flange if you detect a leak. 5. Re‑run the live data scan after the repair to see if the voltage normalizes.

  5. 5

    Sensor Cleaning – Remove Dirt or Carbon Build‑up

    1. If visual inspection shows grime on the sensor’s diaphragm, remove the MAP sensor using a 10 mm socket. 2. Gently wipe the diaphragm with a lint‑free cloth and a small amount of electronic‑grade cleaner. 3. Avoid touching the thin membrane with your fingers; any oil can cause false readings. 4. Reinstall the sensor, reconnect the wiring, and re‑check live data. 5. Cleaning often restores a low‑input reading caused by contamination.

  6. 6

    Replace the MAP Sensor

    1. When voltage remains low after the previous steps, the sensor itself is likely defective. 2. Purchase a replacement MAP sensor that matches your vehicle’s make, model, and engine (e.g., “MAP sensor for 2015‑2018 Chevrolet Silverado 5.3 L”). 3. Disconnect the battery (negative terminal) to protect the PCM. 4. Remove the old sensor, install the new one, and torque the mounting bolts to the manufacturer’s specification (usually around 8‑10 Nm). 5. Re‑connect the battery, clear the DTC with the scanner, and perform a short test drive.

  7. 7

    Clear Codes and Verify Repair

    1. With the OBD‑II scanner, select “Erase Codes” or “Clear DTCs.” 2. Turn the ignition off, wait a few seconds, then restart the engine. 3. Watch the live MAP data for at least two minutes; it should stay within the normal voltage range and not dip low when you accelerate. 4. If the code returns, re‑examine wiring and PCM voltage supply; otherwise, the repair is complete. 5. Take the vehicle on a varied drive (city, highway, idle) to confirm smooth operation.

When to Call a Professional Mechanic

If the MAP sensor voltage stays low after checking connectors, wiring, and vacuum leaks, or if you find a damaged PCM supply line, a professional will need to perform PCM diagnostics or replace the PCM itself.

Diagnostic Flowchart

Follow this visual guide to systematically diagnose P0107:

Your check engine light just came on, and the scanner shows P0107 – MAP/Barometric Pressure Circuit Low Input.

You’re not alone—thousands of drivers see this code each year, especially on Toyota, Honda, Ford, and Chevrolet models. The MAP sensor tells the engine control module (ECM) how much air is being forced into the engine. When the sensor’s voltage drops below the minimum the ECM expects, the computer assumes the intake pressure is too low, which can cause rough idle, hesitation on acceleration, and poorer fuel economy.

Below is a full‑scale, step‑by‑step guide that walks you through everything from the quickest visual checks to a complete sensor replacement. By the end of this guide you’ll know whether you can keep driving, how much the repair will cost, and when it’s time to call a professional.

Real-World Diagnostic Scenario: P0107

When a technician encounters P0107 in the shop, the diagnostic approach differs significantly from other codes. Unlike generic fuel system codes, P0107 requires checking specific subsystems in a particular order to avoid misdiagnosis. Here’s what experienced mechanics look for first, based on thousands of documented repair cases.

Several manufacturers have issued TSBs specifically addressing the root causes of P0107. Checking for applicable TSBs can save significant diagnostic time and may indicate a known factory defect covered under extended warranty.

Note: TSB availability varies by manufacturer and model year. Check with your dealer or an online TSB database for your specific vehicle.

Frequently Asked Questions

Q: What is the average repair cost for code P0107, and does it vary by vehicle make?

The average repair cost for code P0107, which indicates a manifold absolute pressure (MAP) sensor circuit low input, can range from $100 to $300, depending on the vehicle make and model. For example, on a Ford F-150, the repair cost may be around $200, while on a Chevrolet Silverado, it may be closer to $250. Additionally, if the MAP sensor is integrated into the engine control module (ECM), the repair cost can be significantly higher, up to $1,000 or more.

Q: Is it safe to drive with code P0107, or can it cause damage to my engine?

Driving with code P0107 can lead to decreased engine performance, poor fuel efficiency, and potentially cause damage to the engine over time. The MAP sensor plays a critical role in regulating engine airflow, and a faulty sensor can cause the engine to run rich or lean, leading to increased emissions and potential engine damage. However, in most cases, the code will not cause immediate engine failure, and you can drive the vehicle to a repair shop, but it’s essential to address the issue as soon as possible.

Q: What is the most common cause of code P0107 on Toyota Corolla and Honda Civic models?

On Toyota Corolla and Honda Civic models, the most common cause of code P0107 is a faulty MAP sensor or a clogged vacuum hose connected to the sensor. In some cases, a wiring issue or a corroded connector can also trigger the code. For example, on the Toyota Corolla, a clogged vacuum hose is a common cause, while on the Honda Civic, a faulty MAP sensor is more likely to be the culprit.

Q: Will code P0107 cause my vehicle to fail an emissions test?

Code P0107 can potentially cause your vehicle to fail an emissions test, as the faulty MAP sensor can lead to increased emissions. The MAP sensor plays a critical role in regulating engine airflow, and a faulty sensor can cause the engine to run rich or lean, leading to increased emissions. However, the impact on emissions test results may vary depending on the vehicle make and model, as well as the specific emissions test procedures used in your area.

Q: How long does it take to repair code P0107, and can I do it myself?

The repair time for code P0107 can vary depending on the vehicle make and model, as well as the technician’s level of experience. On average, the repair can take around 1-2 hours to complete, depending on the complexity of the issue. While it’s possible to diagnose and repair the issue yourself, it’s recommended to seek the help of a professional mechanic, especially if you’re not familiar with the vehicle’s engine and electrical systems.

Code P0107 is specific to a manifold absolute pressure (MAP) sensor circuit low input, while code P0106 indicates a MAP sensor circuit range/performance problem, and code P0108 indicates a MAP sensor circuit high input. Each code has a distinct set of symptoms and causes, and addressing the specific code is essential to ensure proper engine performance and prevent further damage. For example, code P0106 may be caused by a faulty MAP sensor or a wiring issue, while code P0108 may be caused by a clogged vacuum hose or a faulty sensor.

Q: Can code P0107 be caused by a low battery voltage or a faulty alternator?

In some cases, code P0107 can be triggered by a low battery voltage or a faulty alternator, as the MAP sensor relies on a stable voltage supply to function properly. If the battery voltage is low or the alternator is not charging the battery properly, it can cause the MAP sensor to malfunction, leading to code P0107. However, this is not a common cause, and other factors, such as a faulty MAP sensor or wiring issue, are more likely to be the culprit.

Q: Will clearing code P0107 with a scan tool fix the problem, or is further diagnosis required?

Clearing code P0107 with a scan tool will not fix the underlying problem, and further diagnosis is required to identify the root cause of the issue. The code is simply an indication of a problem with the MAP sensor circuit, and clearing the code will only temporarily remove the warning light from the dashboard. A thorough diagnosis, including visual inspections, wiring tests, and sensor checks, is necessary to identify and repair the underlying cause of the problem.

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Published: · Updated: · By FixCarCodes Team

This guide is for informational purposes only. Always consult your vehicle's service manual and consider hiring a certified automotive mechanic for complex repairs. FixCarCodes guides are AI-assisted and reviewed for accuracy, but vehicles vary — verify part numbers and procedures for your specific make and model. Learn about our editorial process.