Question about 2003 Chevrolet TrailBlazer

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Trouble code P0105 continues to set on 2003 chevy trailblazer

We changed the MAP sensor, the camshaft position sensor and the crankshaft position sensor. We also replaced the connecting rod bearings because of a bad knock. The bearing #3 was worn paper thin and there were metal shavings in the oil pan.

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If you have bearing problems MAP sensor codes are the least of your worries. Check on the cost of getting a new engine. I hope this is not the problem. Good luck Moe

Posted on Apr 24, 2009

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Definition of Diagnostic Trouble Code P1345 Audi: Ignition Coil Power Output Stage 3 Short to Ground BMW: Misfire Cylinder 2 with Fuel Cut-Off Buick: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Cadillac: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Chevrolet: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Ford: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) GMC: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Isuzu: Crankshaft Position - Camshaft Position Correlation Kia: No SGC Signal (1.6L) Lexus: Variable Valve Timing / CMP Sensor Range / Performance Lincoln: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) Mazda: Cylinder Discrimination Signal (from CMP sensor) Mercury: Cylinder Discrimination Signal (Signal From Camshaft Position Sensor) Oldsmobile: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Pontiac: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Saturn: Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation Toyota: Variable Valve Timing / CMP Sensor Range / Performance Volkswagen: Ignition Coil Power Output Stage 3 Short to Ground

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My check engine light keeps coming on! The code that keeps coming up is p0105! What exactly is it? The map sensor has already been changed and still the check engine light stays on and the same code still...


Well, something related to manifold pressure is at issue. Look for intake leaks, cracked or dislodged hoses. Check engine compression, it appears that the Map sensor was a victim and not a cause. This is often the case with error codes.

Jul 23, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

I JUST WANT THE CODES FOR CHEVY TRAILBLAZER 2004...


  • Feb 7/11 - P0405
  • Jan 11/11 - P0336 - P0326
  • Dec 28/10 - P0217 - P0218 - P0163 - P0230 - P0231 - P0232
  • Dec 9/10 - Trouble Codes: P0170 - P0173 - P0162 - P0154 - P0142
  • Dec 6/10 - More DTC articles: P0157 - P0158 - P0160 - P0200
  • Nov 30/10 - DTC articles posted: P0505 - P0156
  • Nov 18/10 - More new articles: P0143 - P0144 - P0146 - P0147 - P0152
  • Nov 12/10 - P0120 - Throttle Position Sensor/Switch A Circuit Malfunction
  • Nov 11/10 - ECT Circuit Codes: P0116 - P0117
  • Nov 10/10 - P0111 - IAT Circuit Range/Performance Problem
  • Nov 7/10 - P0110 - Intake Air Temperature Circuit Malfunction
  • Nov 6/10 - P0108 - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
  • Oct 21/10 - P0216 Injection Timing Control Circuit Malfunction
  • Sept 11/10 - Knock Sensor DTCs: P0327 P0332
  • Mar 15/10 - P0607 Control Module Performance Code
  • Mar 4/10 - P0606 PCM Processor Fault DTC
  • Feb 10/10 - New ECT Sensor article
  • Feb 9/10 - P0012 & P0022 - Camshaft Position - Timing Over-Retarded
  • Feb 2/10 - P0115 - Engine Coolantmag-glass_10x10.gif Temperature Circuit Malfunction DTC
  • Jan 19/10 - P0105 - MAP/Barometric Pressure Circuit Malfunction
  • Feb 10, 2011 | 2004 Chevrolet TrailBlazer

    2 Answers

    Would like to know where the Cam Shaft Sensor is located in 2002 Trailblazer.


    it is the sensor that is being pointed at in the cylinder head


    9a01378.jpg

    Sep 12, 2010 | 2005 Chevrolet TrailBlazer

    1 Answer

    I have a p0105 error. They say this is a dirty body throttle. How can I clean this myself? My car is a 2002 Chevy Envoy.


    DTC P0105 - Crankshaft Position Sensor B Circuit Malfunction or Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction


    What does that mean?
    The MAP (Manifold Absolute Pressure) sensor is part of the fuel management system. It reacts to changes in engine manifold pressure. The PCM (Powertrain Control Module) monitors the MAP sensor continually to properly run the engine. Changes in engine load require changes in the amount of fuel injected, and timing of the ignition system, etc. An engine under load has more manifold pressure(or less vacuum) than an engine that is coasting. As the load changes, the MAP sensor voltage signal to the PCM changes accordingly. To check the MAP sensor operation, though, the PCM watches other sensors to verify that the MAP sensor is working properly.

    For example, the PCM compares the TPS (Throttle Position Sensor) signal to the MAP signal to verify the MAP signal isn't "sticking". If the PCM doesn't see a MAP sensor change immediately follow a change in the throttle pedal sensor, it knows there is a problem with the MAP sensor and sets P0105. Or, if the PCM notices that the TPS indicates the engine is under load, but the MAP signal indicates that the engine is "coasting" it, again, knows there is a problem with the MAP sensor or TPS and sets P0105.

    Symptoms: Symptoms of a P0105 check engine light code may include:
    * Poor running engine
    * Engine runs rich
    * Engine won't idle
    * Engine backfires through tailpipe
    * Engine misfire under load or at idle
    * MIL (Malfunction Indicator Lamp) illumination
    * In some extreme cases there may be no symptoms other than MIL illumination

    Causes: A P0105 DTC could be caused by:
    * MAP sensor vacuum hose disconnected or plugged
    * Bad MAP sensor
    * Bad TPS
    * Damaged or problematic MAP sensor connector
    * Damaged or problematic TPS connector
    * Damaged wiring
    * Short to reference voltage on signal circuit of MAP sensor
    * Loss of ground to MAP sensor or TPS
    * Open on signal circuit of MAP sensor
    * Bad PCM

    Possible Solutions: Using a scanner or code reader, turn the ignition on and engine OFF; what does the MAP sensor voltage read? It should be about 4 Volts for sea level. If you are at a higher altitude, it should decrease about half a volt or so for each 1,000 ft. of altitude (this will vary from model to model) Or if you have a separate MAF (Mass air flow) sensor on your vehicle, they are usually equipped with a Barometric pressure reading. If so, the Baro reading should match the MAP reading (they both measure ambient air pressure). If they're roughly equal, then, check for Freeze Frame data of the MAP sensor (if available).

    NOTE: Freeze Frame data is the PCM recording a fault when it happens. It captures the readings of the various PIDS (parameter identifiers)available to troubleshoot what happened. It's like a recording of the problem as it happened. At idle a typical MAP sensor Voltage reading should be about a volt, and at WOT (wide open throttle) it should approach 4.5 to 5 Volts. As for the TPS, at idle, the voltage reading is about 1 Volt or less. As the throttle is opened the reading will increase to 4.5 Volts at WOT. Do the two readings make sense? For example, if the TPS reading on Freeze Frame data shows 2.5 Volts (indicating partial throttle) does the MAP sensor indicate a reading that isn't at either extreme? Using the Freeze Frame data (if available) compare the MAP reading to the TPS when the problem occurred. This can help you identify what happened

    If you have no access to Freeze Frame data then check if the MAP sensor voltage changes when you apply vacuum to it. You can do this by mouth or a vacuum pump. The voltage should increase as you apply vacuum. If the reading doesn't change as you apply vacuum, make sure there are no obstructions in the hose to the sensor. If the hose is clear, the MAP sensor is usually bad, but it doesn't rule out the following from causing the problem: Does the MAP sensor appear to be stuck at less than .5 Volts? Then:

    NOTE: This code shouldn't set if the MAP is stuck at extremely low voltage, however, I'm adding it in because there's no way to know for certain for which vehicles a low voltage condition may set a P0105.

    1. Inspect the wiring harness and MAP sensor connector. Repair any damage
    2. Unplug the MAP sensor connector. Also, at the PCM connector, remove the MAP sensor signal wire and check for continuity to the MAP sensor connector. If there is infinite resistance, then repair open in MAP signal circuit. If the signal wire has continuity to the MAP sensor connector, then check for 5 volt reference voltage to the connector and a good ground. If both are present, then re-install all removed wiring and replace the MAP sensor.

    Does the MAP sensor appear to be stuck at full 4.5 voltage? Then:

    1. Inspect the wiring harness for damage. Repair as needed
    2. Remove the MAP sensor signal wire from the PCM connector. With a voltmeter measure the voltage with KEY ON ENGINE OFF. Is there 4.5 Volts? If so, unplug the MAP sensor and recheck. If it is still present, then repair short between the signal wire and 5 volt reference wire.
    3. If unplugging the MAP sensor causes the voltage to disappear, check that the ground is intact. If it is, then replace the MAP sensor due to internal short.

    MAP sensor codes include P0105, P0106, P0107, P0108 and P0109 .


    Hope helps (remember rated this).

    Jul 09, 2010 | 2002 GMC Envoy

    4 Answers

    Trouble codes p0340 and p0014 for a chevy trailblazer engine keeps either idling up real fast or trys to die


    You need to check the cam phazer and see if it's damaged. Lots of the time it leaks oil into the connector and messes up the wires. Also I've seen the oil control screens come out of the phazer and go into the engine, which will also set the coeds. If I were you I'd pull the phazer out and see if all 3 of the oil control screens are there. My bet is one will be missing. Make sure to change the oil too. You may get lucky and it will have made it to the oil pan? Other wise I wouldn't worry too much about it. Most of the time it will not cause any engine problems. Good luck, oh and you do have to pull the power steering pump off to get the phazer out. But you can just take the bolts out for the pump and let it fall down so you can get the phazer out!

    Nov 26, 2009 | 2002 Chevrolet TrailBlazer

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