P2135 on Volvo
Throttle/Pedal Position Sensor Voltage Correlation
P2135 on Volvo vehicles indicates throttle/pedal position sensor voltage correlation. Au7o has documented this code across 4 Volvo models — most commonly on C70, S70, V40. P2135 means the powertrain computer detected that the two throttle position (TP) or accelerator pedal position sensors disagree with each other. Drive-by-wire systems use redundant sensors so the PCM can cross-check the throttle or pedal reading for safety; if the two signals don't correlate within an expected range, this code sets. As a fail-safe, the vehicle often enters a reduced-power 'limp' mode, causing sluggish acceleration, a stuck or hesitant throttle, and a warning light. Because it affects throttle control, it should be addressed promptly. Typical repair costs on Volvo range from $300 to $800, depending on the specific model and root cause.
Common Causes of P2135
- •Faulty throttle position sensor / throttle body assembly
- •Faulty accelerator pedal position sensor
- •Damaged wiring or connectors at the throttle body or pedal
- •Corroded or loose connector terminals
- •Poor ground or reference voltage problem
- •Carbon buildup binding the electronic throttle plate
- •Failed PCM (rare)
P2135 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 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.
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View P2135 across all makes →Frequently Asked Questions
What does P2135 mean on Volvo?▼
P2135 stands for "Throttle/Pedal Position Sensor Voltage Correlation." P2135 means the powertrain computer detected that the two throttle position (TP) or accelerator pedal position sensors disagree with each other. Drive-by-wire systems use redundant sensors so the PCM can cross-check the throttle or pedal reading for safety; if the two signals don't correlate within an expected range, this code sets. As a fail-safe, the vehicle often enters a reduced-power 'limp' mode, causing sluggish acceleration, a stuck or hesitant throttle, and a warning light. Because it affects throttle control, it should be addressed promptly. On Volvo specifically, this code is documented across 4 models.
What causes P2135 on Volvo vehicles?▼
Common causes on Volvo: Faulty throttle position sensor / throttle body assembly, Faulty accelerator pedal position sensor, Damaged wiring or connectors at the throttle body or pedal, Corroded or loose connector terminals, Poor ground or reference voltage problem. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2135 on a Volvo?▼
Repair costs on Volvo range from $300 to $800, depending on the specific model and root cause.
Which Volvo models have P2135 documented?▼
Au7o has documented P2135 on 4 Volvo models: C70, S70, V40, V70.