Is it safe to drive with a P0122 code?

Severity is high. Address P0122 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0122?

Repair costs for P0122 typically range from $50 to $500 in the US, depending on the underlying cause. The most common fix is: Open TPS signal wire.

What are the symptoms of P0122?

CEL. Limp mode. No throttle response. Stalling.

Check Engine Code

P0122

Throttle Position Sensor / Switch A Circuit Low Input

Severity: high DIY difficulty: 2/5 Typical cost: $50–$500

Last updated April 30, 2026

What P0122 means

P0122 means the TPS signal is below the expected idle voltage — typically a wiring open/short to ground, or a failed sensor.

Vehicle-specific P0122 guides

P0122 can mean different things on different vehicles. Pick your make for engine-family specifics:

P0122 on Ford → P0122 on VW →

Symptoms

CEL
Limp mode
No throttle response
Stalling

Likely causes (most common first)

Open TPS signal wire
Failed TPS
Bad connector
Internal throttle body fault

Can I keep driving?

High — risk of damage if ignored

Typical repair cost

DIY fixes can start near $50 (parts only). Shop repairs for P0122 typically run up to $500 depending on the underlying cause and vehicle. Start with the most common cause — Open TPS signal wire — before throwing parts at it.