P0123 on Jeep: How to Diagnose & Fix
Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
1 Jeep model · 1 documented issue · $50-$220 repair
P0123 on Jeep by model: symptoms, diagnosis and fix
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.
Common Symptoms
- High or hunting idle
- Stalling when coming to a stop
- Hesitation/bucking on acceleration
- Erratic or harsh automatic shifting
- Check-engine light
How to Fix
Confirm with a scan tool (P0121/P0122/P0123) and swap in a quality TPS — Mopar 04874371AC (superseded by 68433984AA). Owners strongly recommend Mopar, Standard Ignition, or NGK over cheap economy sensors, which frequently fail again. Verify closed-throttle voltage and idle relearn after install.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Omix 17224.04 throttle-position sensorOEMOmix 17224.04
Replace a circuit-tested TPS on the early throttle-body branch Fitment/availability: 1997-2001 Wrangler TJ 2.5L or 4.0L; verify connector and throttle-body/tang geometry before ordering.
- Genuine Mopar 68404428AA throttle-position sensorOEMMopar 68404428AA
Replace a circuit-tested TPS on the later throttle-body branch Fitment/availability: 2002-2006 Wrangler TJ/Unlimited with 2.4L or 4.0L as cataloged; verify VIN and connector.
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Sources for this issue (2)
P0123 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0123 mean on a 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 it is documented across 1 model: Wrangler.
What are the most common causes of P0123?
The most common causes of P0123 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0123 on a Jeep?
Published repair estimates on Jeep range from $50 to $220 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0123 on a different make?
View P0123 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.