Use a multimeter to test the sensor and pedal connector terminals for faulty or bad wires.Our mechanic shows you how to do this in the video above, at 4:03. Use a multimeter and move the meter dial to the ohms option (our mechanic describes it as looking like a little horseshoe) to test the sensor connector wires for a break that could trigger P2138. Use a multimeter to test for a break in the sensor connector wiring.If the incorrect kind of dielectric grease is used, such as grease for 12 volts rather than the connector’s 5 volts, that could be causing the issue. Only low-voltage dielectric grease should be used on this connector. Also check for any dielectric grease on the connector terminal. If any of the connector’s wires are frayed or loose, which you can double-check by gently tugging on the wires. Disconnect the connector (3:13) to further inspect it, and check for any corrosion in the terminals. You can also watch the data being graphed while you wiggle the wires to see if the data changes, which would indicate a wiring or connector issue is triggering P2138. Inspect the APP sensor connector and wires for damage, fraying, disconnection, or the wrong type of dielectric greaseĬheck the APP sensor connector to make sure it’s tightly connected and inspect the sensor wires for any frays or other damage (2:54).If the data changes, that indicates the issue is stemming from the pedal itself and not the sensor wires. Certain scan tools have an option called “Agree or Disagree,” which lets you know whether the data from the two APP sensors “agrees.” If you use a scan tool with this option and see before trying anything else that the data disagrees, from there, gently step on the accelerator and watch for a change in the data. You may find the sensor isn’t working correctly because it’s dirty or has bad contact, in which case the pedal itself will need to be replaced. With the engine running and your car put in “Park,” lightly press on the gas, and watch the graph on the scan tool to make sure the data doesn’t dip or spike drastically (1:59 in the video above). If there is a spike or dip, you’ll know there’s something wrong with that particular sensor. Use a scan tool or code reader that graphs data to determine which APP sensor is triggering P2138.Save Up to 50% Off Quality Auto Parts How Do I Diagnose Code P2138? Incorrect dielectric grease used on the APP or TP sensor connector.Faulty or damaged APP or TP sensor wiring or circuits.A faulty, bad, loose, or disconnected APP or TP sensor connector.A failing, faulty, or dirty APP or TP sensor.This basically means your car’s computer (powertrain or engine control module) has put your car into a safe mode to reduce heavy acceleration or fast speeds since code P2138 was triggered. Your engine reduced power light may come on.Your car may have trouble accelerating or go into reduced-power mode when this code is triggered, which lets you know it’s not the best idea to drive with P2138. We recommend addressing the issue causing code P2138 as soon as possible. If you see a large spike or dip from one sensor, then you’ll know which sensor is triggering the P2138 code. You can see if the data correlates by watching it on your scan tool as you press the gas with your car parked. He uses an OBD-II scan tool to look at the data for both sensors to see whether the sensors are working normally. It’s important to know that these sensors won’t reflect exactly the same data, but each sensor’s data needs to correlate with the other’s and fall within a certain range. ![]() In simpler terms, it’s an OBD-II code triggered when one of the two sensors in your gas pedal malfunctions.Īs our mechanic explains in the video above (1:07), a gas pedal has two APP sensors to essentially serve as fail-safes for each other in case one triggers an error code. What Is Code P2138 and What Does It Mean?Ĭode P2138 is an accelerator pedal position (APP) sensor or throttle position (TP) sensor code. Want to watch more videos like this? Visit our video library for thousands of automotive diagnostic and how-to videos.
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