P0122 OBD-II Trouble Code: Throttle Pedal Position Sensor/Switch (TPS) A Circuit Low Input

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0122 code

P0122 is a diagnostic trouble code (DTC) for "Throttle Pedal Position Sensor/Switch (TPS) A Circuit Low Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P0122 DIAGNOSTIC Get a fair and transparent estimate upfront

P0122 code definition

Throttle Pedal Position Sensor/Switch (TPS) A Circuit Low Input

What the P0122 code means

The P0122 is the generic OBD-II code which indicates that the Engine Control Module (ECM) has seen the TPS sensor circuit A output voltage go below the sensor's expected range.

What causes the P0122 code?

The TPS sensor circuit A output to the ECM went below the specified voltage and is going to .2 volts or less.

What are the symptoms of the P0122 code?

  • The ECM turns the Check Engine Light on and goes into a failsafe mode by cutting current to the throttle actuator to put the throttle valve to approximately less than a 6 degrees opening.

  • The ECM controls fuel injection and timing to control engine speeds.

  • The vehicle would be able to be driven very slowly with limited throttle response.

  • The engine may idle higher than normal and not accelerate as well as before it started to fail.

Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.

How does a mechanic diagnose the P0122 code?

  • Scans and documents the codes received, and views the freeze frame data to see when the code was set

  • Clears the OBD-II fault codes and retests the vehicle to see if the code comes back

  • Visually checks all the TPS connections and wiring for any loose or damaged items

  • Compares the data between TPS circuit A and B on the scanner and if incorrect, performs the TPS pinpoint tests as per the manufacturer's recommendations

  • Replaces the TPS if necessary, clears the codes, then performs a road test

Common mistakes when diagnosing the P0122 code

  • Not doing a visual inspection first

  • Not scanning, documenting, clearing and retesting the codes to verify failures

  • Replacing the TPS sensor without and indication that it is the problem

  • Not comparing the TPS sensor A and B to be within specification before and after repair or replacements

How serious is the P0122 code?

The P0122 code will cause the engine's ECM to go into a failsafe mode, which will cause various drive issues like lack of acceleration, high idle, bucking or jerking, limited speeds, or stalling, depending on manufacturer failsafe mode strategy.

What repairs can fix the P0122 code?

Additional comments for consideration regarding the P0122 code

  • The P0122 code may be accompanied by other TPS codes, so following the manufacturer's pinpoint tests for each code received may be needed to fix the complaint.

  • Most failures for code P0122 involve a defective TPS sensor, or a loose connector.

  • All TPS codes will cause the ECM to go into failure mode; drive symptoms will be the roughly the same.

Need help with a P0122 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
P0122
trouble codes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0122 code.

SCHEDULE P0122 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


Related questions

Gauges fluctuate wildly then car turns off.
Hello. Though there are a lot of common issues that can cause this, the most common is a voltage issue. Low voltage will cause each of these symptoms and codes you are getting. I usually start by testing the ignition...
Steaming of the engine
Hi, thanks for writing in. Codes P0107 (https://www.yourmechanic.com/article/-p0107-obd-ii-trouble-code-manifold-air-pressure-map-barometric-pressure-sensor-circuit-low-voltage-input-problem-by-john-nelson) and P0122 (https://www.yourmechanic.com/article/p0122-obd-ii-trouble-code-throttle-pedal-position-sensor-switch-tps-a-circuit-low-input-by-jay-safford) could show up for several reasons, such as a faulty mass air flow sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-mass-airflow-sensor). If you would like help, consider having an expert automotive technician from YourMechanic come...
Throttle position sensor - 1994 Ford F-150
Hello. The only thing to do is to verify that the TPS was installed in the correct position. Make sure you did not put the little blade on the throttle body behind instead of in front of the sensor blades....

More related articles

P0460 OBD-II Trouble Code: P0460 Fuel Level Sensor Circuit Malfunction
P0460 means there is a discrepancy between the fuel gauge and the actual fuel level in the tank. Which could be caused by a fuel sensor malfunction.
P0760 OBD-II Trouble Code: Shift Solenoid C Malfunction
P0670 code means there has been an irregularity detected within shift solenoid C often due too hydraulic blockages or low transmission fluid.
P0493 OBD-II Trouble Code: Fan Overspeed
P0493 means there's a voltage problem with the electric cooling fan control system due to a faulty fan motor, fan relay, wiring, fan fuse, or sensor.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com