Question about Chevrolet TrailBlazer

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03 Chevy Trail Blazer Trouble code PO105 Someone has replaced lots of parts on this vehicle i.e. cam sensor, crank sensor, map sensor, o2 sensor, can not drive truck, no power, will not rev over 2500rpm

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  • jimmythehook Jun 17, 2009

    i have replaced map sensor checked fuel pressure and droped exhaust still same

  • Richard Scordino May 11, 2010

    check converter for obstructions?

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  • Master
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P0105 is MAP (Manifold Absolute Pressure) or BARO (Barometric pressure) circuit malfunction

Posted on Jun 17, 2009

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  • Master
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HI, this code represents a failed MAP sensor. the circuit is malfunctioning(Insufficient Activity).

Replace the MAP sensor asap if possible.

The MAP sensor(Manifold absolute pressure sensor), is located on the back side of the intake manifold. on top.







Posted on Jun 17, 2009

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  • Michael Masters
    Michael Masters Jun 17, 2009

    Ok, if you have received the code once again after the map replacement, this will signal that you did not replace the map correctly or, the wires connected to the map are damaged.

  • Michael Masters
    Michael Masters Jun 17, 2009

    this code only concerns the map sensor. that it. check the map housing and wires for flaws.

  • Michael Masters
    Michael Masters Jun 17, 2009

    I would also check the inspect the intake manifold gasket for leaks and worn corner as well. this can cause map sensor malfunctions.

    Good luck:)


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Codes p171 and p0174 on a chevy truck?


Subject: 97-05 Vehicles with 4.8 5.3 5.7 and 6.0 Gen III V8 Engines and Misfires on One Bank - kw CEL diagnostics driveability DTC P0171 P0172 P0174 P0175 P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 #PIP3056 - (07/12/2004)

Models: (00-05 Cadillac Escalade - C6 and K6) and (02-05 Chevrolet Avalanche - C1, C2 K1 and K2) and (99-05 Chevrolet Silverado - C1, C2 K1 and K2) and (00-05 Chevrolet Suburban - C1, C2, K1 and K2) and (00-05 Chevrolet Tahoe - C1 and K1) and (99-05 GMC Sierra C1, C2 K1 and K2) and (00-05 GMC Yukon - C1, C2, K1 and K2) and (03-05 Chevrolet Express G1, G2, G3, H1, H2 ) and (03-05 GMC Savana G1, G2, G3, H1, H2 ) and (04-05 Buick Rainier S1, T1 ) and (03-05 Chevrolet Trail Blazer EXT S1, T1 ) and (03-05 GMC Envoy XL XUV S1, T1 ) and (03-05 Hummer H2) and (04-05 Cadillac CTS-V DB) and (98-02 Chevrolet Camaro FB) and (97-04 Chevrolet Corvette YB) and (98-02 Pontiac Firebird FB) and (04-05 Pontiac GTO VB)

The following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank.

Recommendation/Instructions:
If the published misfire diagnostic does not isolate the cause, perform the following suggestions as necessary:
  • Perform a fuel injector balance test for all 8 cylinders. If a fuel injector concern exists, it is possible to misfuel an entire bank of the engine, causing multiple cylinders on the same bank to misfire even though the root cause is a single fuel injector.
  • Inspect O2 sensor connections on the misfiring bank for corrosion or water intrusion. If water intrusion is found on the right bank, it may be due to the AC Evaporator Condensation dripping onto the O2 sensor harness. If this condition is found, reposition and shield the harness to prevent a repeat concern and repair the connections.
  • Check for excessive exhaust backpressure using the restricted exhaust diagnosis.
  • Swap the Position 1 O2 sensors side to side to see if the misfires move to the other bank of the engine. If so, replace the O2 sensor.
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

NOTE: GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition.

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