P0123 on Volvo
Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
P0123 on Volvo vehicles indicates throttle/pedal position sensor/switch 'a' circuit high input. Au7o has documented this code across 1 Volvo model — most commonly on S60. 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 Volvo range from $300 to $700, 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 Volvo by Model
Volvo S60(1 issue)
- Electronic Throttle Module (ETM) Failure2001-2004
The 2001-2004 S60 (and other P2 platform Volvos) is notorious for ETM failure due to a design flaw in the throttle body electronics. The module develops internal solder joint cracks and corroded contacts, causing the car to enter limp mode, stall at idle, or refuse to accelerate. Volvo issued an extended warranty covering ETMs up to 10 years/200,000 miles, but many are now beyond that coverage.
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What does P0123 mean on Volvo?▼
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 Volvo specifically, this code is documented across 1 model.
What causes P0123 on Volvo vehicles?▼
Common causes on Volvo: 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 Volvo?▼
Repair costs on Volvo range from $300 to $700, depending on the specific model and root cause.
Which Volvo models have P0123 documented?▼
Au7o has documented P0123 on 1 Volvo model: S60.