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2001 Dodge Stratus 2.7L - OBD2 Code P0106: Fuel Trim Issues and Sensor Diagnosis

Model: 2001 dodge stratus Fault Code: P0106 Posted: 2015-03-20 16:08

I own a 2001 Dodge Stratus with a 2.7L engine, and I've been experiencing a persistent OBD2 fault code P0106. This issue has come and gone over time, even after replacing the Manifold Absolute Pressure (MAP) sensor twice. I also identified and repaired a broken vacuum line. However, when reviewing the freeze frame data, the fuel trim values are consistently at 0%, and most other parameters show near-zero readings. Despite multiple checks with a multimeter—showing no voltage anomalies or continuity issues—I'm still unable to resolve this problem. What could be causing this behavior? Are there specific diagnostic steps I should follow beyond sensor replacement?

Related fault codes
P0106
Comments (7)
Anonymous 2015-03-21 08:21

https://www.obd-codes.com/p0106 - KEY WORD: MAP SENSOR CIRCUIT

Anonymous 2015-03-21 16:17

When the key is on and the engine is off, what voltage does your OBD2 scan tool read at the MAP sensor? This is critical for diagnosing circuit integrity.

Anonymous 2015-03-22 16:17

Autojoe wrote: When the key is on and the engine is off, what voltage does your OBD2 scan tool read at the MAP sensor? This is critical for diagnosing circuit integrity. My scan tool is a basic model and doesn't provide real-time data. I've used a multimeter to check voltages directly at the sensor terminals, and all readings appear normal. I’ve also tested the wiring harness by wiggling it—no changes in voltage or signal were observed.

Anonymous 2015-03-22 18:32

MAP circuit testing must be performed with the MAP sensor connector plugged in and back-probed at both the sensor end and the Powertrain Control Module (PCM) end. This ensures accurate readings of the actual signal being sent to the PCM.

Anonymous 2015-03-23 16:57

Autojoe wrote: MAP circuit testing must be performed with the MAP sensor connector plugged in and back-probed at both the sensor end and the PCM end. This ensures accurate readings of the actual signal being sent to the PCM. I’ve tested the sensor side using a back probe, but not yet at the PCM. Are other sensors on the vehicle sharing a common ground? My freeze frame shows nearly all values at zero—this may explain why multiple parameters are reading zero.

Anonymous 2015-03-24 07:38

Could you please share the actual voltage readings from your back-probe tests? A scan tool is essential here because we need to see exactly what the PCM receives. Without real-time data, diagnosing the issue becomes significantly more difficult.

Anonymous 2015-04-23 04:37

I cleaned all ground connections and discovered that several sensors—including the MAP sensor—share a common grounding point. After cleaning and securing this connection, everything has stabilized so far. This likely explains why other parameters were showing zero in the freeze frame. Thanks for your guidance!