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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
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.

trouble codes
P0122
Check Engine Light

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


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,064

Rating Summary
4,665
194
48
27
130
4,665
194
48
27
130

Mario

8 years of experience
22 reviews
Mario
8 years of experience
Chrysler PT Cruiser - Check Engine Light is on - Los Angeles, California
He was very courteous and knowledgeable. You can tell he knows his trade. Satisfied with his service.

Yoel

8 years of experience
91 reviews
Yoel
8 years of experience
Nissan Versa Note - Check Engine Light is on - Upper Darby, Pennsylvania
Yoel is very competent and provides great customer service. He took the time to explain and show me exactly what was going with my car. I will definitely use him again and recommend him to others.

Jason

31 years of experience
148 reviews
Jason
31 years of experience
Ford Explorer - Check Engine Light is on - Phoenix, Arizona
Jason was on time, friendly, explained everything he was doing and let me know the other services available, so when Jason comes back to install the new part I am having the oil changed too.

DeVaughn

25 years of experience
1 reviews
DeVaughn
25 years of experience
BMW X3 - Check Engine Light is on - Moreno Valley, California
The mechanic arrived on time, completed the work, which was replacement of an oxygen sensor, in a timely and professional manner.


Related questions

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....

Steaming of the engine

Hi, thanks for writing in. Codes P0107 and P0122 could show up for several reasons, such as a faulty mass air flow sensor. If you would like help, consider having an expert automotive technician from YourMechanic come to your home...

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...

More related articles

P2274 OBD-II Trouble Code: O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3
P2274 P2274 code definition O2 (Oxygen) Sensor Signal Stuck Lean Bank 1 Sensor 3 What the P2274 code means This code definition indicates that either the oxygen sensor has failed, there is an exhaust leak before the sensor, or the...
P0014 OBD-II Trouble Code: Camshaft Position B - Timing Over-Advanced or System Performance (Bank 1)
P0014 code definition Camshaft Position “B” - Timing Over-Advanced or System Performance (Bank 1) What the P0014 code means P0014 is the...
P2509 OBD-II Trouble Code: ECM/PCM Power Input Signal Intermittent
P2509 P2509 code definition The P2509 diagnostic trouble code is an indication that the ECM/PCM power input signal is having an intermittent problem. Related Trouble Codes: P2505 OBD-II Trouble Code: ECM/PCM Power Input Signal P2506 OBD-II Trouble Code: ECM/PCM...

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.

1-800-701-6230 · hi@yourmechanic.com