Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Silverado mass air flow sensor

My truck is throwing code 101 mass air flow i have already changed out the mass air flow sensor, the throttle position sensor, the fuel pump, and the air filter and the check engine light keeps comeing back on what else can i do to fix the problem?

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  • Chevrolet Master
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The map sensor could be the problem for code P0101
hope it helps

Posted on Mar 27, 2014

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1 Answer

I have a 1988 crx si, it's idle keeps surging and I've already replaced the iac valve and tps. It's got a d16a6


Have you checked the mass air flow sensor. It could be weak. Are there any other error codes after changing the IAC and throttle position sensor

Nov 12, 2016 | Cars & Trucks

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I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
  • Air leak between MAF sensor and throttle body
  • TP sensor not seated properly
  • Damaged TP sensor
  • Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Mar 09, 2015 | 1998 Ford Windstar

1 Answer

Mass air flow engine code


Ps101 is not a valid code. Please recheck.

Mar 27, 2014 | 2004 Chevrolet Silverado 1500 Crew Cab

2 Answers

2005 Expedition Throttle Position Sensor changed now won't start


There is a possibility that the sensor is slightly out of place and not reading, or, the sensor itself is goofed and misreading the position. (i.e. If the TPS is telling the computer it is at wide open throttle already, it won't start) Check for spark and see if the car will start with the TPS disconnected (starting with it disconnected will throw a code, just be ready to clear it out)

Jan 12, 2014 | 2005 Ford Expedition

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1991 Nissan maxima hesitates


Best guess is O2 sensor is reading too much unburned fue in the exhaust for some reason and leaning out the fuel flow to compensate. Runs when you throw more throttle at it but leans out as you try to hold steady speed. Should throw a code though.

Apr 25, 2013 | 1991 Nissan Maxima

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Volvo 2001 s60 t5 can't keep the ralenti rpm at less than 1500rpm, the car constantly shut off.


code po172 is your bank 1 o2 sensor and code po121 is your throttle posit sensor that controls your RPMs .code po102 is your maf -mass air flow sensor. and code 01172 is a throw in code from the others cause problem. you need a o2 sensor and mass air flow sensor and throttle position senor

Dec 10, 2012 | Cars & Trucks

1 Answer

ISUZU TROOPER 3.2 V6 CODE P0101


P0101 ISUZU - Mass Air Flow Circuit Performancexicon.jpghttp://engine-codes.com/p0101_isuzu.htmlForum CodePossible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notes Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor

Jul 04, 2012 | 2001 Isuzu Trooper

1 Answer

No power jucking but can drive throw it is it the air mass meter !!!!


Your description, I venture has a number of things misspelle by accident. "Jucking" Maybe "Jerking?" But you can drive "throw" as though" it is the air mass meter.
Keep in mind, I am not making fun of you, I have made my share of misspelled words and sentances which were a little confusing.
As for the mass air flow sensor, looking at technical service bulletins, there is one which pertains to the throttle position sensor, Air Idle Contril Valve and the Mass Air Flow Meter. They reference connections which need to be checked and insured that they are clean. These can cause a balk or hesitation and stumble. False air problems can also caise the same conditions. Look for vacuum leaks. The main hose which connects the air mass meter to the throttle body may have a crack or tear in it. As you apply throttle, the engine is going the jump and shift position a little. This can cause a small to massive air leak between the air mass sensor and the throttle body. Un metered air means poor performance.

Aug 07, 2011 | 2002 Kia Sportage

1 Answer

P0068 on a 2006 Dodge Ram 1500 SLT. Rough "hunting" for idle. Momentary lag/loss of power from a stop. Random RPM changes while at a constant speed. Sometimes it feels like it drops out of gear...


P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

Jul 10, 2011 | Dodge Ram 1500 Cars & Trucks

1 Answer

OK My 03 2500, Silverado pulls a code: PO 101, Mass Air flow circuit out of range, what do I change to fix it?


The MAF sensor (Mass Air Flow) is located in in the air induction system usually just after the air filter and before the throttle body, and the ECM (Engine Control Module) uses the signal generated from the MAF sensor to determine how much fuel the engine receives. However, before you replace the MAF sensor you should be certain that there are no air or vacuum leaks in the air induction system especially between the throttle body and the MAF sensor, and also that all of the hose clamps are all good and tight on the air induction boot especially between the throttle body and the MAF sensor, and check if the air flow is being restricted from the air cleaner side of the MAF. (check the air filter and check the air intake to the air cleaner for any obstructions that might be restricting the air flow to the MAF)

You can also clean the MAF sensor with carburetor spray because they build up a very fine dust on the air velocity sensors that are mounted on wires that are suspended in the air stream to monitor and determine the amount of air flow into the engine, and when the MAF sensor becomes dirty the MAF sensor will loose performance. Be very careful when cleaning the air velocity sensors inside of the MAF sensor because they are very delicte and are easily damaged, and do not touch them with anything other than the spray from the carburetor can and that is all that is necessary to clean the air velocity sensors. Here are some images that I have put together to assist you.


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Jun 21, 2010 | 2003 Chevrolet Silverado 2500HD

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