Is it safe to drive with a P0123 code?

Severity is high. Address P0123 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 P0123?

Repair costs for P0123 typically range from $50 to $500 in the US, depending on the underlying cause. The most common fix is: Short to 5V reference.

What are the symptoms of P0123?

CEL. Limp mode. High idle. Erratic shifting.

Check Engine Code

P0123

Throttle Position Sensor / Switch A Circuit High Input

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

What P0123 means

TPS reading is above the expected WOT voltage. Usually a wiring short to 5V or a failed sensor.

Symptoms

CEL
Limp mode
High idle
Erratic shifting

Likely causes (most common first)

Short to 5V reference
Failed TPS
Damaged harness

Can I keep driving?

High — risk of damage if ignored

Typical repair cost

DIY fixes can start near $50 (parts only). Shop repairs for P0123 typically run up to $500 depending on the underlying cause and vehicle. Start with the most common cause — Short to 5V reference — before throwing parts at it.

Related codes

P0120 P0121 P0122

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