P0122 on Jeep
Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input
P0122 on Jeep vehicles indicates throttle/pedal position sensor/switch 'a' circuit low input. Au7o has documented this code across 1 Jeep model — most commonly on Wrangler. This generic code means the PCM detected a lower-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. This sensor tells the computer how far the throttle/pedal is open so it can manage fuel, timing, and on drive-by-wire systems the throttle itself. A low or lost signal can cause hesitation, surging, poor acceleration, stalling, or limp-home mode, so it should be diagnosed promptly. Typical repair costs on Jeep range from $50 to $220, depending on the specific model and root cause.
Common Causes of P0122
- •Faulty throttle position sensor
- •Short to ground or open in the TPS signal circuit
- •Damaged or corroded TPS connector
- •Loss of reference voltage or bad ground to the sensor
- •Worn throttle body / TPS contacts
- •Chafed or pinched wiring harness
- •Faulty PCM (rare)
P0122 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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View P0122 across all makes →Frequently Asked Questions
What does P0122 mean on Jeep?▼
P0122 stands for "Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input." This generic code means the PCM detected a lower-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. This sensor tells the computer how far the throttle/pedal is open so it can manage fuel, timing, and on drive-by-wire systems the throttle itself. A low or lost signal can cause hesitation, surging, poor acceleration, stalling, or limp-home mode, so it should be diagnosed promptly. On Jeep specifically, this code is documented across 1 model.
What causes P0122 on Jeep vehicles?▼
Common causes on Jeep: Faulty throttle position sensor, Short to ground or open in the TPS signal circuit, Damaged or corroded TPS connector, Loss of reference voltage or bad ground to the sensor, 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 P0122 on a Jeep?▼
Repair costs on Jeep range from $50 to $220, depending on the specific model and root cause.
Which Jeep models have P0122 documented?▼
Au7o has documented P0122 on 1 Jeep model: Wrangler.