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If i switch on ignition tank motor does not runs

I have diagnosed the vehicle and found fault for p2138

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Possible causes Faulty Accelerator Pedal Position Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Electric Throttle Control Actuator

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Posted on Jan 11, 2015


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Vehicle cutting out

Fault code p2138 if you know it? If you don't. Google it.

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One is a multiple misfire and the o2 sensor

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What is a P2138 fault code

code p2138 refers to--throttle position sensor/switch D/E voltage correlation causes ---wiring--TP sensor/switch I would check that the switch is connected properly or I would replace the throttle position sensor/switch.

Mar 31, 2013 | 2006 Pontiac Grand Prix

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I own a ssanyong actyon sports pickup, one day the twin curly yellow light turn on, when I send to the mechanic, he diagnose and found out one of the low plug was malfunction, so he change that,but the...

I would have done the repairs in reverse order but used a mechanic with knowledge of the vehicle.
The pump in the tank is the low pressure pump and gets power through what sounds like the faulty relay.
Always use the service manual to determine where the fault lies.
Get power to the pump and then check again. Probably just a blown fuse will stop the pump. The engine will still run and start with a couple of glow plugs out as they are only used when the temperature is very low.

Apr 25, 2017 | Cars & Trucks

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I have a 2009 chevy impala. i have codes p2138, p0455 and p0442. what are these codes and how do I get rid of them?

Same 3 codes , p0455, p0442, & p2138 on my 2009 Chevy Impala and brought the car to a General Motor or Buick Dealer Service Department to replace vent solenoid or solenoid fuel tank evaporator control . Also replaced gas pedal position sensor.

Feb 18, 2012 | Chevrolet Cars & Trucks

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Four seemingly unrelated fault codes;
P0526 - fan speed error
P0141 - downstream O2 sensor lean condition
P2135 - Throttle position sensor fault
P2138 - Accelerator position fault

You need to have a qualified technician diagnose this with a highend scan tool, maybe there is a possibility that a reference voltage is off spec.

Sep 02, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

I have a p2138 code and when engine light comes on it starts losing power and you to shut off engine and restart and it will go for awhile and it will happen again. next day no problem

There is a GM Technical Service Bulletin (TSB) on this issue, below is a summary;

#07-06-04-019A: Intermittent MIL/SES, DTC P2138 with Reduced Engine Power (Repair Instrument Panel (IP) to Body Harness Connector)

Models: 2005-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn)
2005-2008 HUMMER H2
2006-2008 HUMMER H3
2005-2008 Saab 9-7X


Some customers may comment on an intermittent MIL/SES light Illuminated with a message center or an indicator that displays Reduced Engine Power. DTC P2138 - Accelerator Pedal Position (APP) Sensor 1-2 Correlation may be set. The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for more than a brief period. Refer to DTC P2138 in SI for further diagnostics.


On some vehicles, the IP to body harness connector, which carries the APP signal to the ECM/PCM, is located in the left hand kick panel area or inside the IP. Water intrusion into these areas could cause an electrical short in the APP circuits setting a P2138 code.


Note: Make sure that no add-on/aftermarket equipment is electrically connected to the APP signals or to the other ECM/PCM five volt reference or return lines. These can generate false P2138 and/or other ETC System DTCs. If there are other engine DTCs besides P2138, such as MAP sensor faults (i.e. P0107, P0108), resolve these first before attempting to diagnose P2138 DTCs.

Important: Refer to DTC P2138 in SI to confirm that the ETC pedal is operating correctly.

Locate the IP to body harness connector, which may be located in and around the left hand kick panel area or inside the IP. Check to see if there is a water leak into the area and repair as necessary. Use a water hose to determine the source of a water leak and effectiveness of repair. Some examples of potential water leaks are: A-pillar seals, sunroof drain lines (if so equipped) and windshield/cowl sealing. Finally, repair or replace the IP to body harness connector, making sure no corrosion or debris is left on or between the terminals.

Sep 07, 2010 | Chevrolet TrailBlazer Cars & Trucks

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I have a Nissan Frontier with accelerator & throttle problems. I have sensor codes p2122 & p2138. How do i fix this problem? Is it a self fix problem? HELP!

Throttle/Pedal Position Sensor/Switch "D" Circuit Low
P2122 - APP Sensor 1 Low Input

Probable Causes:
1 - Failed APP Sensor 1
2 - Open or short circuit condition
3 - Poor electrical connection


P2138 - APP Sensor Performance Condition Fault

Probable Causes:
1 - Failed APP Sensor
2 - Open or short circuit condition
3 - Poor electrical connection
I hope this helps you and thank you

Feb 14, 2010 | Nissan Frontier Cars & Trucks

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Car frequently dies while driving.

Hi,sorry i was not able to find any other Fixya experts to help with your problem, but I can offer some other generic faults which would cause the symptom you describe.
Most modern cars which use electronic fuel injection and ignition have basically the same components so here we go..

1) Fuel pressure, the fuel pump can cause intermittent shut down of engine as this unit works with mostly unfiltered fuel.
Try starting engine and closely listen to pump which is fitted inside fuel tank, if you here loud humming, this is usually a sign that the pump is not 100% and may suddenly seize, cool down and start running again...can be a little tricky to check, also if you can drive vehicle and fault occurs, fuel pump will only run while engine is running and also approx 10 seconds after ignition is turned on, so you will probably need some else to switch ignition on while you listen.
2) Air flow and throttle position sensors are very hard working components of the injection system, the problem is that they are very difficult to diagnose particularly with the limited information I have to work with in this situation.
3) Ignition system has computer, crack angle sensor and many other too many to mention, but I have found the most common is coil pack/s or ignition power supply solenoid.(The one that clicks in engine bay when ignition switch is turned to the "on" postion.
P.S If you can forward a more detailed descrition of what happens when the vehicles fails maybe I could shed more light on the matter.
Regards MMP

Aug 04, 2008 | 1994 Oldsmobile Ninety Eight

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