P0121 on Volvo
Throttle/Pedal Position Sensor Circuit Range/Performance
P0121 on Volvo vehicles indicates throttle/pedal position sensor circuit range/performance. Au7o has documented this code across 5 Volvo models — most commonly on C70, S60, S70. This code means the throttle position (or accelerator pedal position) sensor's signal does not match what the computer expects compared with other inputs like airflow, RPM, and the second throttle/pedal sensor. The sensor tells the computer how far the throttle or pedal is open; when its range or performance is off, the computer can't trust how much power you're requesting. You may notice hesitation, surging, poor acceleration, rough idle, or the vehicle dropping into a reduced-power 'limp' mode. It indicates an out-of-range or implausible signal rather than a complete loss of signal. Typical repair costs on Volvo range from $300 to $800, depending on the specific model and root cause.
Common Causes of P0121
- •Worn or failing throttle position sensor
- •Dirty or carboned-up throttle body affecting plate position
- •Damaged, frayed, or shorted sensor wiring
- •Corroded or loose sensor connector
- •Poor sensor ground or reference voltage
- •Faulty throttle body / electronic throttle actuator
- •Mismatch between the two throttle or pedal sensor signals
P0121 on Volvo by Model
Volvo C70(1 issue)
- Electronic Throttle Module (ETM) Failure1999-2005
Same ETM failure as other P2 platform Volvos. The early C70 (1998-2005, first gen) is most susceptible.
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.
Volvo S70(1 issue)
- Electronic Throttle Module (ETM) Failure1999-2000
The S70 ETM (drive-by-wire throttle body) develops internal contact wear causing intermittent stalling, reduced power mode, and check engine light. This was subject to a Volvo extended warranty and is one of the most common P2 platform failures.
Volvo V40(1 issue)
- Electronic Throttle Module (ETM) Failure2000-2004
The S40/V40 first generation (2000-2004) uses the same problematic ETM as other Volvos of the era. Internal contact wear causes throttle position sensor errors and reduced power mode.
Volvo V70(1 issue)
- Electronic Throttle Module (ETM) Failure1999-2002
Same ETM failure as S70/S60/S80 of the era. The drive-by-wire throttle body contacts wear internally. Early P2 V70s (1999-2002) are most affected.
Looking for P0121 on a different make?
View P0121 across all makes →Frequently Asked Questions
What does P0121 mean on Volvo?▼
P0121 stands for "Throttle/Pedal Position Sensor Circuit Range/Performance." This code means the throttle position (or accelerator pedal position) sensor's signal does not match what the computer expects compared with other inputs like airflow, RPM, and the second throttle/pedal sensor. The sensor tells the computer how far the throttle or pedal is open; when its range or performance is off, the computer can't trust how much power you're requesting. You may notice hesitation, surging, poor acceleration, rough idle, or the vehicle dropping into a reduced-power 'limp' mode. It indicates an out-of-range or implausible signal rather than a complete loss of signal. On Volvo specifically, this code is documented across 5 models.
What causes P0121 on Volvo vehicles?▼
Common causes on Volvo: Worn or failing throttle position sensor, Dirty or carboned-up throttle body affecting plate position, Damaged, frayed, or shorted sensor wiring, Corroded or loose sensor connector, Poor sensor ground or reference voltage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0121 on a Volvo?▼
Repair costs on Volvo range from $300 to $800, depending on the specific model and root cause.
Which Volvo models have P0121 documented?▼
Au7o has documented P0121 on 5 Volvo models: C70, S60, S70, V40, V70.