P0107 -What Does It Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon)

One of the most common MAP sensor trouble codes you'll encounter, on your Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL), is the P0107: MAP Sensor Circuit Low Voltage.

In this tutorial, I'll explain what this trouble code means. I'll also talk about some of the tests you can perform to find its cause and solution.

You can find this tutorial in Spanish here: Código P0107 ¿Qué Significa? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon) (at: autotecnico-online.com).

APPLIES TO: This tutorial, on the P0107 OBD II trouble code, applies to the following vehicles:

Chevrolet:

• Silverado (1500, 2500):
  • 4.8L, 5.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Silverado (2500):
  • 6.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Suburban (1500):
  • 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Suburban (2500):
  • 6.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Tahoe:
  • 4.8L, 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

GMC:

• Sierra (1500, 2500):
  • 4.8L, 5.3L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Sierra (2500):
  • 6.0L: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Yukon:
  • 4.8L, 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Yukon XL (1500):
  • 5.3L: 2000, 2001, 2002, 2003, 2004, 2005, 2006
• Yukon XL (2500):
  • 6.0L: 2000, 2001, 2002, 2003, 2004, 2005, 2006

RELATED TROUBLE CODES:

• P0106 -What Does It Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).
• P0108 -What Does It Mean? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).

What Does Trouble Code P0107 Mean?

The fuel injection computer can predict what the output MAP signal voltage should be based on engine RPM and the input of the throttle position sensor (TPS).

At key on but engine off (KOEO), the fuel injection computer knows it should see a high signal voltage value from the MAP sensor.

Once the engine starts and the engine is idling (throttle plate is at rest and low engine RPM), the fuel injection computer expects a low MAP signal voltage value.

As the throttle plate opens and engine RPM increase, the fuel injection computer knows it should see an increasing MAP signal voltage.

When the actual MAP signal voltage does not increase when the throttle plate opens and engine RPM increase, to match the values the fuel injection computer has predicted, you'll see a P0107: MAP Sensor Circuit Low Voltage trouble code set and illuminate the check engine light.

Common Symptoms Of A P0107 Trouble Code

When the MAP sensor stays stuck reporting a low signal voltage value that does not match the actual intake manifold pressure, engine performance will suffer.

You'll see one or more of the following symptoms:

• Check engine light illuminated.
• Rough or low idle.
• Very high idle.
• Engine may start and stall.
• Little to no acceleration.
• Black smoke comes out of the tailpipe when the engine is running.

What Does The MAP Sensor Do?

The MAP sensor has two specific jobs. The first is to provide the fuel injection computer with a barometric pressure reading when you turn the key on but before you start the engine.

The other, is report the engine load by measuring the intake manifold vacuum pressure as the engine runs.

When the engine is idling and the throttle plate is closed, intake manifold pressure is high.

This high intake manifold pressure will cause the MAP sensor to produce a low voltage signal (usually around 2 Volts DC).

As you step on the accelerator pedal, the throttle plate opens and the engine accelerates. This causes a decrease in intake manifold vacuum pressure.

This low intake manifold pressure will cause the MAP sensor to produce a high voltage signal. At wide open throttle (like when you trying to run that red light), the MAP sensor produces a voltage around 4 Volts DC.

As long as the fuel injection computer sees the MAP sensor voltage signal decreasing/increasing, as you step on or off the accelerator pedal, it knows that the MAP sensor is functioning correctly.

What Causes A P0107 Trouble Code?

The most common cause of a P0107 trouble code is generally a bad MAP sensor, but it's not the only one.

Here are other causes of a P0107 trouble code:

• The MAP sensor is not getting 5 Volts due to an open-circuit or short-circuit problem in its 5 Volt supply wire.
• An open-circuit problem in the MAP sensor signal wire between the MAP sensor and the fuel injection computer.
• An short-circuit to Ground problem in the MAP sensor signal wire between the MAP sensor and the fuel injection computer.
• A bad MAP sensor connector.
• Bad fuel injection computer (although a very rare problem).

How To Diagnose And Repair A P0107 Trouble Code

You can easily be diagnose and repair a P0107 trouble code by removing, inspecting and testing the MAP sensor.

The test involves using a multimeter to confirm that the MAP sensor signal voltage decreases/increases as you apply/release vacuum to it.

Then making sure that the MAP sensor is getting 5 Volts and Ground from the fuel injection computer.

You can conclude that the MAP sensor is bad, and needs to be replaced, if your test results confirm:

• That the MAP sensor signal voltage DOES NOT decrease/increase as you apply/release vacuum to the sensor.
• That the MAP sensor is getting 5 Volts.
• That the MAP sensor is getting Ground.

Testing the MAP sensor is easy. I have written tutorial that explains the test in detail here:

• How To Test The MAP Sensor (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon).

Where To Buy The MAP Sensor And Save

To avoid a come-back of the MAP sensor problem, you should avoid buying a cheap knock-off MAP sensor.

The following links will help you comparison shop for the original equipment (OE) AC-Delco MAP sensor. The other two sensors are from two well-known automotive brands: Standard Motor Products and Delphi brands:

NOTE: The above manifold absolute pressure (MAP) sensor fit the 1999-2006 V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL).

More Silverado, Suburban, Tahoe, Sierra, And Yukon Tutorials

You can find a complete list of V8 Chevrolet Silverado (Suburban, Tahoe) and GMC Sierra (Yukon, Yukon XL) tutorials in this index:

• GM 4.8L, 5.3L, 6.0L Index Of Articles.

Here's a small sample of the tutorials you'll find in the index:

• Resistance Specifications Of The TAC Electronic Throttle Body.
• How To Test The GM Accelerator Pedal Position (APP) Sensor 2.
• How To Test The MAF Sensor (GM 4.8L, 5.3L, 6.0L, 8.1L).
• Blown Head Gasket Test (GM 4.8L, 5.3L, 6.0L).