⚡ AUTO CODE FIX
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EngineCritical✅ DIY Friendly

P0122

Throttle/Pedal Position Sensor A Circuit Low Input

TPS circuit voltage is below 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 TPS connector for corrosion
  • Step 2:Test TPS reference voltage (5V)
  • Step 3:Check wiring for short to ground
  • Step 4:Replace TPS
💡 Pro Tip: Limp mode (limited to low RPM) often indicates a TPS fault — the ECM defaults to safe operation.

Repair Cost Estimate

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

Frequently Asked Questions

What does OBD2 code P0122 mean?+
P0122 stands for Throttle/Pedal Position Sensor A Circuit Low Input. TPS circuit voltage is below expected range.
What causes code P0122?+
Short to ground in TPS wiring; Faulty TPS; Corroded connector; Throttle body damage
How do I fix code P0122?+
Check TPS connector for corrosion; Test TPS reference voltage (5V); Check wiring for short to ground; Replace TPS
How much does it cost to fix P0122?+
Estimated repair cost for P0122 is $100–$400.
Is P0122 DIY-friendly?+
Yes — P0122 is generally DIY-friendly with basic tools.

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