Diagnostic Trouble Code
P0106
MAP/Barometric Pressure Circuit Range/Performance Problem
Technical Description P0106
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
What Does This Mean P0106?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
The Powertrain Control Module (PCM) uses the Manifold Absolute Pressure Sensor (MAP) to monitor engine load. (NOTE: Some vehicles have a Barometric Pressure (BARO) sensor that is integral to the Mass Air Flow (MAF) sensor and do not have a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAP sensor where the MAP sensor functions as a backup input in case of MAF failure.
The PCM supplies a 5 Volt reference signal to the MAP sensor. Usually the PCM also supplies a ground circuit to the MAP sensor as well. As the manifold pressure changes with load, the MAP sensor input informs the PCM. At idle the voltage should be 1 to 1.5 Volts and approximately 4.5 Volts at Wide Open Throttle (WOT). The PCM looks for any change in manifold pressure to be preceded by a change in engine load in the form of changes in throttle angle, engine speed, or Exhaust Gas Recirculation (EGR) flow. If the PCM doesn't see any of these factors change while detecting a rapid change in MAP value, it will set a P0106.
The Powertrain Control Module (PCM) uses the Manifold Absolute Pressure Sensor (MAP) to monitor engine load. (NOTE: Some vehicles have a Barometric Pressure (BARO) sensor that is integral to the Mass Air Flow (MAF) sensor and do not have a MAP sensor. Other vehicles have a MAF/BARO and a redundant MAP sensor where the MAP sensor functions as a backup input in case of MAF failure.
The PCM supplies a 5 Volt reference signal to the MAP sensor. Usually the PCM also supplies a ground circuit to the MAP sensor as well. As the manifold pressure changes with load, the MAP sensor input informs the PCM. At idle the voltage should be 1 to 1.5 Volts and approximately 4.5 Volts at Wide Open Throttle (WOT). The PCM looks for any change in manifold pressure to be preceded by a change in engine load in the form of changes in throttle angle, engine speed, or Exhaust Gas Recirculation (EGR) flow. If the PCM doesn't see any of these factors change while detecting a rapid change in MAP value, it will set a P0106.
Symptoms P0106
1
Engine runs rough
2
Black smoke at tailpipe
3
Engine will not idle
4
Poor fuel economy
5
Engine misses at speed
Possible Causes P0106
1
Bad MAP sensor
2
Water/dirt intrusion affecting MAP sensor connector
3
Intermittent open in the reference, ground, or signal wire for the MAP sensor
4
Intermittent short in the reference, ground, or signal wire for the MAP sensor
5
Ground problem due to corrosion causing intermittent signal problem
6
A break in the flexible air intake duct between the MAF and the intake manifold
7
Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)
Solutions & Repair Steps P0106
Using a scan tool, watch the MAP sensor value with the key on, engine off. Compare the BARO reading with the MAP reading. They should be roughly equal. The voltage for the MAP sensor should read approx. 4.5 volts. Now start the engine and look for a significant drop in the MAP sensor voltage indicating the MAP sensor is working.
If the MAP reading doesn't change perform the following:
Other MAP sensor trouble codes include P0105, P0107, P0108 and P0109.
If the MAP reading doesn't change perform the following:
Other MAP sensor trouble codes include P0105, P0107, P0108 and P0109.