P0123 Code

Description
TP SENSOR CIRCUIT HIGH VOLTAGE

Throttle Position (TP) sensor measures amount of throttle
opening. PCM uses TP sensor information for fuel delivery
calculations. TP sensor readings during acceleration are much higher
than those during deceleration or idle.
Symptoms

• Rough idle
• High idle
• Surging
• Stumbling

Causes

• TPS not mounted tightly
• TPS plug or wire damaged and shorting
• Defective TPS
• Damaged computer (PCM)

Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

• Inspect TPS plug and wires, repair
• Test TPS
• Verify ECT readings match coolant gauge, need scan tool for this