Question about 1991 GMC Sierra

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Can a MAP sensor just be faulty?

Changed out with others, but not new

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Try this, disconnect map sensor while running. if it runs a lot worse or rough. map is ok. but if it does not make a difference the way the engine runs it is bad. if disconnected the engine may shut off. this tells you the sensor is doing its job. yes they can go bad!

Posted on May 11, 2014

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2003 sonoma shuts down when MAP sensor is plugged in


Could be a bad one even if its new it happens

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I have a 2001 Dodge Durango 4.7, the check engine light is on, is throwing a P0122 throttle position sensor voltage low code, removed TPS and replaced with a new sensor, started truck and check engine...


Did you check sensor wiring circuits? Orange wire is 5 volt ref, with key on. Black wire with lite blue tracer is ground. The other orange wire has a tracer color, that is signal wire.
The tps shares ref voltage and ground with map sensor. You may need to check map sensor? I'm not saying it is faulty, I don't know?

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Symptoms of a bad map sensor on 93 cadillac fleetwood brougham


Well code 23 is a faulty signal from the manifold air temp sensor. The sensor is telling the computer the air temp in the intake is out of range compared to the other readings.
Code 26 is a quad driver problem inside the computer.
Code 34 is a MAP sensor signal saying the vacuum is high when it should be low compared to the other sensors.
They may be connected or separate issues. You could check the MAP with a vac gauge.
I would clear the codes and see which ones come back again.

Jul 21, 2012 | 1993 Cadillac DeVille

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2001 chrysler pt cruiser code p1297


The code doesn't say anything it simply gives you a circuit in the electronics that has a problem. In you can the following should help understand that.

P1297 CHRYSLER - No Change In MAP Sensor Voltage xicon.jpghttp://engine-codes.com/p1297_chrysler.htmlForum CodePossible causes- MAP Sensor harness is open or shorted
- MAP Sensor circuit poor electrical connection
- Faulty MAP Sensor
- Faulty ECM

Jul 11, 2012 | 2002 Chrysler PT Cruiser

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My 2004 GMC Envoy has two trouble code readings of 106 & 128. But the light will come on for a while then it will stay off for a while. The auto parts compny that should me the readings said it could...


Hello there,. Below is the detailed information which you asked for.

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P0106 - MAP/Barometric Pressure Circuit Range/Performance ProblemOBD-II Trouble Code Technical Description

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

What does that mean? 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.
Causes A P0106 could be caused by:

  • Bad MAP sensor
  • Water/dirt intrusion affecting MAP sensor connector
  • Intermittent open in the reference, ground, or signal wire for the MAP sensor
  • Intermittent short in the reference, ground, or signal wire for the MAP sensor
  • Ground problem due to corrosion causing intermittent signal problem
  • A break in the flexible air intake duct between the MAF and the intake manifold
  • Bad PCM (do not assume the PCM is bad until you've exhausted all other possibilities)
Possible Solutions 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:
  1. With the Key on, engine off, disconnect the vacuum hose from the MAP sensor. Using a vacuum pump, pull 20 in. of vacuum on the MAP sensor. Does the voltage drop? It should. If it doesn't inspect the MAP sensor vacuum port and vacuum hose to manifold for a restriction of some kind. Repair or replace as necessary.
  2. If there are no restrictions, and the value doesn't change with vacuum, then perform the following: with the Key on and engine off and the MAP sensor unplugged, check for 5 Volts at the reference wire to the MAP sensor connector with a Digital Voltmeter. If there is none, check for reference voltage at the PCM connector. If the reference voltage is present at the PCM connector but not the MAP connector, check for open or short in the reference wire between MAP and PCM and retest.
  3. If reference voltage is present, then check for existing ground at the MAP sensor connector. If it isn't present then repair open/short in the ground circuit.
  4. If ground is present, then replace MAP sensor.
Other MAP sensor trouble codes include P0105, P0107, P0108 and P0109.
P0128 OBD-II Trouble Code Technical Description

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
What does that mean? This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolantmag-glass_10x10.gif temperature (ECT) sensor reading, and the speed of the vehicle.

Causes A code P0128 may mean that one or more of the following has happened:

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
Possible Solutions Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat

Sep 24, 2011 | 2004 GMC Envoy

1 Answer

Car idels fine. stalls when you give it gas. changed o2 sensor, tp sensor, map sensor, and iac sensor. fuel pump and filter are new also. no vacume leaks. any ideas?


Items you should check are the EGR valve, unplug the electrial connector, which will disable it and see what happens. The other is the fuel pressure regulator, the best way is a pressure gage. You can also do a basic check by finding the RETURN line and crimp the rubber part closed with a suitable tool that won't damage it [ a pair of needle nose visegrips with some fuel line over the prongs works ], If it takes gas- then the regulator is faulty and needs to be replaced.

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Most likely this is a false code being shown due to a faulty Map Sensor or O2 Sensor. Replace the O2 Sensor at the downstream position and double check any exposed wires for damage. I have had this problem in other vehicles, it turned out to be an exposed wire on the Downstream O2 sensor that was grounding causing a problem and a bad O2 Sensor. The MAP sensor will do the same thing on occasion but is less likely.

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Car revs in park and pulls when in gear


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