P0107 MAP Sensor Code Explained (2002-2009 4.7L V8 Dodge Ram Pickup)

  • By: Abraham Torres-Arredondo
  • Created: 03 July 2025
  • Updated: 03 July 2025
  • Articl Id: 857
P0107 MAP Sensor Code Explained (2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 4.7L V8 Dodge Ram Pickup)

Got a check engine light and pulled a P0107 MAP sensor code on your 2002–2009 4.7L Dodge Ram pickup? This code means the PCM is seeing a signal from the MAP (Manifold Absolute Pressure) sensor that's lower than expected —usually stuck near 0 Volts.

Trouble codes like P0107 can lead to poor performance, rough idling, or even limp mode.

But before replacing the sensor, it's important to understand what this code really means and what could be causing it.

In this tutorial, I'll walk you through the symptoms, causes, and whether you should test or replace the MAP sensor.

Contents of this tutorial:

APPLIES TO: This tutorial applies to the following vehicles:

  • 4.7L V8 Dodge Ram 1500 Pickup: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009.

MAP SENSOR MULTIMETER TESTS:

MAP SENSOR WIRING DIAGRAMS:

OTHER MAP SENSOR TROUBLE CODES EXPLAINED:

What Does P0107 Really Mean?

Depending on your scan tool, code P0107 might show up with a generic definition or a factory-specific one for your 2002–2009 4.7L V8 Dodge Ram pickup:

  • Generic OBD II Definition: P0107 – Manifold Absolute Pressure/Barometric Pressure Circuit Low Input.
  • Dodge Factory Definition: P0107 – MAP Sensor Voltage Too Low.

In plain English, P0107 means the PCM (Powertrain Control Module) is seeing a voltage signal from the MAP (Manifold Absolute Pressure) sensor that's too low —usually below 0.25 Volts. This is a problem because the PCM expects to see the MAP signal vary depending on engine vacuum.

At idle —when intake vacuum is high and your foot is off the gas pedal— the MAP sensor typically outputs around 1.0 to 1.5 Volts. As you step on the gas and vacuum drops, that voltage should rise smoothly up to about 4.5 Volts.

But when a P0107 code sets, the PCM is seeing a MAP signal stuck near zero —even during conditions where it should be higher.

This low reading throws everything off. It tricks the PCM into thinking the engine is under no load at all, when in reality it might be climbing a hill, accelerating onto the highway, or hauling passengers with the A/C on —all examples of real-world engine load.

When the MAP signal doesn't match reality, the PCM can no longer trust the sensor. Depending on the vehicle's programming, it may adjust fuel delivery, alter ignition timing, or in some cases, enter reduced power mode to protect the engine or transmission.

Next up, I'll walk you through the most common symptoms you might feel when this code appears.

Common Symptoms Of A Code P0107

When your 2002–2009 4.7L Dodge Ram pickup sets a P0107 MAP sensor voltage low code, you'll definitely notice something's off. The PCM depends heavily on the MAP sensor to manage fuel delivery and ignition timing, so when it gets a bad signal, it usually shows up in how the engine runs.

Here are the most common symptoms you might run into:

  • Check engine light (CEL) on.
  • Hard starting or long cranking time.
  • Stalling or rough idle.
  • Engine hesitation or stumbling during acceleration.
  • Poor fuel economy.
  • Reduced engine power or limp mode.

These symptoms often come and go, especially if the MAP sensor is failing intermittently or there's a wiring issue. But they all point to the same conclusion —the PCM isn't getting the vacuum signal it expects, and it's trying to compensate.

In the next section, I'll show you the most common causes behind a P0107 MAP sensor code, so you can avoid guessing and fix it right the first time.

What Causes Code P0107?

The P0107 MAP sensor voltage low code is set when the PCM sees a MAP signal that's below the expected range —usually under 0.2 Volts— even when the engine is running. This tells the PCM something's off, and it throws the code to let you know what's happening.

But here's the thing —a low MAP signal doesn't always mean the sensor itself is bad. There are other possible culprits. Here's what I've run into over the years when dealing with a P0107:

  • Defective MAP sensor stuck at a low voltage output.
  • Open in the MAP sensor signal wire (the DK GRN/RED wire).
  • Short to Ground in the signal wire.
  • MAP sensor connector issues —bent terminals, corrosion, or broken locking tab.
  • Dry-rotted wire insulation near the sensor connector (common on high-mileage engines).
  • Oil contamination inside the MAP sensor (from blow-by entering the intake manifold).
  • Damaged intake manifold gaskets causing vacuum leaks.
  • Other sensors shorted internally and pulling down the shared 5 Volt reference circuit.
  • Bad PCM (rare, but possible).

To truly fix this issue, you'll want to test the MAP sensor signal, power, and Ground circuits. The good news? You can do all of this with a simple multimeter and a vacuum pump —no expensive tools needed. I'll walk you through it step-by-step in this guide:

Next up, I'll help you decide if you should just replace the MAP sensor —or take a few minutes to test it first.

Should You Replace The MAP Sensor?

If you're dealing with a P0107 MAP sensor voltage low code on your 2002–2007 4.7L Dodge Ram pickup, you might be tempted to just replace the sensor and see what happens. And honestly? That works more often than not.

In fact, that's exactly what most shops do —especially when the sensor is easy to get to and doesn't cost a fortune. If you're leaning that way, here's a quality replacement sensor I recommend:

2002-2003:

2004-2009:

(Buying through the link above helps support this site at no extra cost to you —thanks!)

Now, if you're more of a "test it first" kind of person, you're in good company. I always recommend confirming the issue before throwing parts at the problem.

Especially because testing the MAP sensor is quick, simple, and doesn't require any fancy tools. All you need is a basic multimeter, a handheld vacuum pump, and a few minutes of your time.

Ready to run the tests and know for sure? Follow this step-by-step guide I put together:

More 4.7L V8 Dodge Ram Pickup Diagnostic Tutorials

If you're working on your 4.7L Dodge Ram pickup and want clear, step-by-step help, this index of tutorials is a great place to start. I put them together to make the diagnostic process easier and less frustrating.

Here's a quick look at some of the hands-on tutorials waiting for you there:

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