P0123 on Jeep
Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
P0123 on Jeep vehicles indicates throttle/pedal position sensor/switch 'a' circuit high input. Au7o has documented this code across 1 Jeep model — most commonly on Wrangler. This generic code means the PCM detected a higher-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. The computer uses this signal to know throttle/pedal opening for fuel, timing, and electronic throttle control, so an abnormally high reading disrupts those calculations. Symptoms can include erratic idle, hesitation, surging, poor or sudden acceleration, and limp-home mode, making prompt diagnosis important. Typical repair costs on Jeep range from $50 to $220, depending on the specific model and root cause.
Common Causes of P0123
- •Faulty throttle position sensor
- •Short to voltage in the TPS signal circuit
- •Open sensor ground causing high reading
- •Damaged or corroded TPS connector
- •Worn throttle body / TPS contacts
- •Chafed wiring shorting to a power wire
- •Faulty PCM (rare)
P0123 on Jeep by Model
Jeep Wrangler(1 issue)
- Throttle Position Sensor (TPS) Failure — Erratic Idle, Stalling & Shift Problems1997-2006
The throttle-body-mounted TPS wears and produces an erratic voltage signal, causing high/hunting idle, stalling at stops, hesitation or bucking on acceleration, and — on automatics — erratic or harsh shifting. A very common, high-search TJ driveability complaint that often illuminates the check-engine light.
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What does P0123 mean on Jeep?▼
P0123 stands for "Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input." This generic code means the PCM detected a higher-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. The computer uses this signal to know throttle/pedal opening for fuel, timing, and electronic throttle control, so an abnormally high reading disrupts those calculations. Symptoms can include erratic idle, hesitation, surging, poor or sudden acceleration, and limp-home mode, making prompt diagnosis important. On Jeep specifically, this code is documented across 1 model.
What causes P0123 on Jeep vehicles?▼
Common causes on Jeep: Faulty throttle position sensor, Short to voltage in the TPS signal circuit, Open sensor ground causing high reading, Damaged or corroded TPS connector, Worn throttle body / TPS contacts. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0123 on a Jeep?▼
Repair costs on Jeep range from $50 to $220, depending on the specific model and root cause.
Which Jeep models have P0123 documented?▼
Au7o has documented P0123 on 1 Jeep model: Wrangler.