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P0122 means the vehicle’s control module detected a low signal in a throttle or pedal position sensor circuit. It does not, by itself, prove the sensor is bad. The right fix depends on the vehicle: inspect and test the relevant wiring, connector, reference voltage, ground, and signal using the correct service procedure before replacing parts.
What does P0122 mean?
P0122 is a powertrain diagnostic trouble code indicating a low input in a throttle/pedal position sensor circuit. The code’s exact description, the sensor channel involved, and the threshold that triggers it can vary by make and model.
For example, Mitsubishi Motors’ 2019 service procedure for a particular application calls it “Throttle Position Sensor (main) Circuit Low Input” and sets that application’s criterion at 0.2 volt or less for 0.3 second with the ignition on. That is a vehicle-specific threshold, not a universal P0122 specification. Mitsubishi Motors service procedure
A 2006 Chevrolet Kalos 1.4 DOHC service manual describes the ECM supplying a 5-volt reference and ground to the throttle position sensor, then reading a signal that varies with throttle opening. Its signal criteria are specific to that vehicle as well. Chevrolet service information
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ANCEL AD310 Classic Enhanced Universal OBD II Scanner Car Engine Fault Code Reader CAN Diagnostic Scan Tool, Read and Clear Error Codes for 1996 or Newer OBD2 Protocol Vehicle (Black)
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- Home Necessity and Worthy to Own: This is an excellent code reader to travel or home with as it weighs less and it is compact in design. You can easily slide it in your backpack as you head to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. Moreover, it covers various car brands and is suitable for people who just need a code reader to check their car
Does P0122 mean you need a new throttle position sensor?
No. A failed sensor is one possible cause, but P0122 identifies a detected circuit condition rather than a confirmed failed part. Depending on the vehicle, causes can include a damaged or shorted wire, a poor or damaged connector, the sensor itself, or—in some cases—the engine control module. Mitsubishi lists these categories for its application; it does not establish a universal ranking of causes. Mitsubishi Motors service procedure
Some vehicles also integrate the position sensor into a larger assembly. Whether the sensor is sold separately, what component fits, and whether calibration or a relearn is required must be checked against the exact vehicle’s service information.
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ANCEL AD410 Enhanced OBD2 Scanner, Vehicle Code Reader for Check Engine Light, Automotive OBD II Scanner Fault Diagnosis, OBDII Scan Tool for All OBDII Cars 1996+, Black/Yellow
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How do you diagnose and fix P0122?
Use the procedure for the vehicle’s make, model, year, engine, and market. Ford’s diagnostic procedure illustrates the kinds of checks involved—scan-tool readings, reference voltage, circuit continuity, and shorts—but its sequence and specifications apply to Ford vehicles covered by that procedure, not every car. Ford OBD-II diagnostic procedure
- Record the codes and available freeze-frame data. Note any related codes and the operating conditions captured when P0122 set. Avoid clearing the code before recording useful information.
- Find the vehicle-specific diagnostic procedure. Confirm which sensor circuit the code refers to and obtain the correct connector views, pinouts, test values, and any required safety precautions.
- Inspect the connector and harness. Look for loose connections, corrosion, damaged insulation, chafing, or wiring that may be shorted. Repair confirmed wiring or connector damage using the applicable service instructions.
- Check live data and electrical circuits as directed. A capable scan tool may show sensor readings; the diagnostic procedure may also require checking reference voltage, ground, signal, continuity, or shorts. A basic code reader may not display manufacturer-specific data. Do not apply a threshold or pinout from another vehicle.
- Replace a component only when the tests identify it. If the sensor or an integrated throttle-body assembly fails the specified checks, confirm the correct replacement and any calibration or relearn requirement. If the circuit fault is in the wiring or connector, replacing the sensor alone may not fix it.
- Verify the repair using the vehicle’s procedure. Follow the specified steps for clearing codes, any required relearn, and confirming that the fault does not return.
Can you drive with P0122?
There is no single safe-to-drive rule established for every vehicle with P0122. The symptoms and fail-safe response can differ. Mitsubishi notes restricted throttle opening as a fail-safe on its cited application, but that behavior should not be assumed for other vehicles. Mitsubishi Motors service procedure
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VDIAGTOOL VD10 OBD2 Scanner Check Engine Code Reader Car Diagnostic Tool
- 【A MUST-HAVE SCANNER TOOL FOR DIYERS】 - VDIAGTOOL VD10 car code reader is an incredibly useful, handheld obd2 scanner for each car owner or hobbyist, even for those with little to no experience when it comes to vehicle mechanics! Similar to a fixd car diagnostic tool, using this car diagnostic scanner is extremely easy. All you have to do is attach it to your car OBDII port and you can diagnose car problems in seconds! Read Codes (DTCs); Clear Codes; Live Data; View Freeze Frame; I/M Readiness; Vehicle Information.
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Check the owner’s information for your vehicle and arrange diagnosis promptly if throttle response is abnormal or the vehicle enters reduced-power operation. If the vehicle cannot respond predictably, stop driving when safe and seek assistance rather than relying on a general rule based on the code alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What information is needed to choose the right repair?
The code alone cannot identify the failed part or a universal repair. Diagnosis requires the exact vehicle and its service information: thresholds, pinouts, sensor configuration, test sequence, fail-safe behavior, and relearn requirements may all vary. For a scan tool, check whether it supports your vehicle and can display the relevant live sensor data; code-reading and clearing capability alone may not be enough.
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FOXWELL Car Scanner NT604 Elite OBD2 Scanner ABS SRS Transmission
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FOXWELL NT301 OBD2 Scanner Live Data Professional Mechanic OBDII Diagnostic Code Reader Tool for Check Engine Light
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