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P0107 Code on 2001 GMC Yukon SLT 5.3L After Engine Maintenance - Fix Guide

Model: GMC Yukon 2001 Fault Code: P0107 Posted: 2014-01-30 16:57

Hello everyone! I'm new to this forum and seeking some help with a recurring issue. I own a 2001 GMC Yukon SLT with a 5.3L V8 engine and rear-wheel drive. Recently, I replaced the knock sensor during an engine overhaul, which required removing the air manifold, fuel rails, and injectors — essentially everything on top of the engine. Since then, my Malfunction Indicator Lamp (MIL) has been continuously illuminated due to a P0107 diagnostic trouble code. The truck runs normally with no performance issues — full power, smooth acceleration, and no stalling. I've already installed a new intake manifold gasket, two new knock sensors, and a new knock sensor wiring harness. However, the P0107 code persists. I suspect that something may have been improperly reassembled or loosened during the work. Could it be a loose connection, a damaged wire, or an air leak in the intake system? I'm particularly concerned about the MAP (Manifold Absolute Pressure) sensor location and integrity. Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0107
Comments (6)
Anonymous 2014-01-30 17:14

P0107 refers to a Manifold Absolute Pressure (MAP) sensor issue. It's important to inspect the MAP sensor itself and its connections. Source: https://www.obd-codes.com/p0107

Anonymous 2014-01-30 17:44

I reviewed that link, but my truck only shows the MIL light — no other symptoms. It starts easily and runs fine. I'm not very familiar with technical terms, so could you clarify where exactly the MAP sensor is located? I think I have a general idea.

Anonymous 2014-01-31 07:48

The MAP sensor is located under the sight shield, on the rear portion of the throttle body.

Anonymous 2014-01-31 12:02

Thanks for the clarification! That's exactly where I thought it was. After my recent work, the sensor appears slightly loose — it wobbles when touched. I'm not sure if this is normal or if it happened before the maintenance. During engine work, I had to unplug and move the wiring harness around significantly, so maybe a wire is damaged or shorted? Also, I moved the vacuum hose connected to the sensor several times — could that have caused an issue? It seems like I need to do more physical checks now.

Anonymous 2014-01-31 13:26

I just checked the wiring harness leading into the MAP sensor. It has two wires, and I'm measuring approximately 14.1 volts between them. When I disconnected the evaporative (evap) line from the sensor, there was no noticeable suction — but this didn't affect engine operation. Could improper torque on the intake manifold or a faulty gasket have allowed air to leak into the engine? Would that cause the P0107 code to trigger?

Anonymous 2014-01-31 17:30

You might be looking at the evaporative purge solenoid — it has two wires: pink and dark green/white. The MAP sensor is a three-wire pressure sensor with wires typically colored gray, light green, or orange/black. Make sure you're not confusing these components.