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2008 Chevy Tahoe P0107 Code: MAP Sensor Low Voltage, Misfires, TPS & TC Lights - Troubleshooting Guide

Model: 2008 Chevy Tahoe Fault Code: P0107 Posted: 2018-04-04 12:34

My 2008 Chevrolet Tahoe 5.3L V8 4WD is showing multiple issues: - Check Engine light - TPS (Tire Pressure Monitoring System) warning light - Traction Control (TC) and Stability Trak lights - Cylinders 1 and 4 misfire - OBD2 fault code P0107: MAP sensor low voltage signal Symptoms include: - Vehicle vibration during operation - Gasoline smell upon startup - Excessive exhaust smoke when sharply accelerating Troubleshooting steps I've already taken: - Reprogrammed the engine control module (ECM) — this resolved the No. 2 cylinder misfire - Checked tire pressure sensors; all are functional except the rear right sensor, which provides no signal - Replaced all spark plugs with new OEM parts I'm now frustrated with persistent TC and fuel delivery issues. The P0107 code remains steady after clearing other codes. I suspect either a faulty MAP (Manifold Absolute Pressure) sensor or an electrical issue in the signal circuit, including: - Open/short in the MAP sensor wiring - Faulty 5-volt reference circuit - Ground connection problems - PCM (Powertrain Control Module) failure The expected data stream readings from a scan tool should show approximately 4.5 volts when the engine is off and around 1.5 volts during idle — this is critical for diagnosing the MAP sensor. I'm seeking reliable guidance on how to properly diagnose and resolve P0107 in my 2008 Chevy Tahoe, especially with the presence of TPS and traction control warnings.

Related fault codes
P0107
Comments (5)
Anonymous 2018-04-04 14:20

Start by focusing on P0107. Refer to detailed troubleshooting guides available on this forum for common causes. A low MAP sensor signal (P0107) can result from: - A faulty MAP sensor - Open or short in the signal circuit - Open or short in the 5-volt reference circuit - Ground circuit failure - Faulty PCM For accurate diagnosis, use a scan tool to read live data. Check if the MAP sensor reads around 4.5V (off) and 1.5V (running). This will help confirm whether the issue is hardware or wiring. More details: https://example.com/p0107

Anonymous 2018-04-04 18:40

Are you referring to a 5.3L engine? What other diagnostic codes are present besides P0107 (e.g., P0301, P0304)? TPS light — is this actually the Tire Pressure Monitoring System (TPMS) warning? Traction Control and Stability Trak lights are typically stored in the ABS module, not the engine control module. A dedicated scan tool with live data stream is essential to access all modules properly. Can you confirm if you have such a device? Also, what does 'reprogramming' refer to — was it a software update or a specific calibration? Clarifying this will help assess whether it resolved only one misfire.

Anonymous 2018-04-04 22:58

I'll begin troubleshooting the MAP sensor issue based on the detailed guide linked above. Yes, it's a 5.3L engine; P0107 is the persistent code — all other codes disappear after clearing. TPS light likely refers to TPMS (Tire Pressure Monitoring System). I’ll check if my scan tool still has data stream logs available. Thanks for the input!

Anonymous 2018-04-04 23:01

Found relevant diagnostic data — attached here.

Anonymous 2018-04-06 07:32

You currently have only P0107 and TPMS/ABS-related warnings. Do you still see misfire codes (like P0301/P0304)? Do you have a scan tool with live data stream capability? A multimeter? For P0107, the most likely causes are: - Failed MAP sensor - Missing or faulty 5V reference voltage - Open circuit in the signal wire from MAP to PCM - Poor connector connections On a healthy system, a scan tool should show ~4.5V when off and ~1.5V during idle — this is key for confirming sensor health.