What does code P0122 mean on a Chevrolet and is it safe to drive?
P0122: Throttle/Pedal Position Sensor A Circuit Low Input. Here's what it means on your Chevrolet, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The throttle position sensor (TPS) is reporting a voltage below the minimum expected range. The PCM relies on TPS data to manage fuel delivery and transmission shift points. A low signal can cause erratic throttle response or limp mode.
Common causes for your Chevrolet
- Failed throttle position sensor
- Damaged or corroded TPS wiring or connector
- Faulty throttle body
- PCM failure (rare)
Symptoms
- Check Engine Light
- Hesitation or stumble on acceleration
- Engine may enter limp mode
- Erratic idle
Typical fixes
- Replace throttle position sensor
- Clean throttle body and inspect TPS connector
- Repair damaged wiring
Repair cost range
For a Chevrolet, repairs for P0122 often fall between $100 and $350, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Chevrolet
GM P0122 on drive-by-wire systems is usually a failed electronic throttle body—the TPS is integral to the assembly on most GM applications. Clean the throttle body bore first; if the code returns, replace the throttle body.
Most commonly affected models