⚡ AUTO CODE FIX
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EngineCritical✅ DIY Friendly

P0123

Throttle/Pedal Position Sensor A Circuit High Input

TPS circuit voltage is above expected range.

SeverityCritical
CategoryEngine
Est. Repair Cost$100–$400
Code TypePowertrain
DIY RepairYes

⚡ Common Causes

⚠️ Symptoms

✅ How to Fix — Step by Step

  • Step 1:Check for short to power in signal wire
  • Step 2:Test TPS reference and ground
  • Step 3:Replace TPS
  • Step 4:Inspect wiring harness
💡 Pro Tip: High TPS voltage with no throttle input means the sensor sees full throttle — dangerous for engine management.

Repair Cost Estimate

Full Repair Estimate
$100–$400
DIY Possible?
YES
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0123 mean?+
P0123 stands for Throttle/Pedal Position Sensor A Circuit High Input. TPS circuit voltage is above expected range.
What causes code P0123?+
Open circuit in TPS signal wire; Short to power; Faulty TPS sensor; Damaged wiring
How do I fix code P0123?+
Check for short to power in signal wire; Test TPS reference and ground; Replace TPS; Inspect wiring harness
How much does it cost to fix P0123?+
Estimated repair cost for P0123 is $100–$400.
Is P0123 DIY-friendly?+
Yes — P0123 is generally DIY-friendly with basic tools.

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