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 5 Volvo models — most commonly on C70, S60, S70. 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 S60(1 issue)
- 2001-2002 S60 Throttle Software Recall (06V441000) — Limp Home Mode Without Cause2001-2002
The early S60 sedan, model years 2001 and 2002, was included in NHTSA recall 06V441000, a Vehicle Speed Control campaign Volvo opened on December 29, 2006. Per the recall summary, throttle position sensor irregularities, a dirty throttle housing, and/or inefficient software calibration may cause a warning lamp to light, followed by the onset of limp home mode. The important part for an S60 owner is the consequence NHTSA recorded: this resulted in a high number of vehicles going into limp home mode without need. In other words, the car's own protective strategy was being triggered too readily. Volvo's fix was a recalibration rather than hardware. The campaign covered 170,099 vehicles in total, counting all models included in it.
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(2 issues)
- 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.
- V70 Software Recall 06V441000 — Throttle Warning Lamp and Needless Limp Home Mode1999-2002
1999 through 2002 V70 wagons fall under NHTSA recall 06V441000. Volvo's filing describes a combination of factors — throttle position sensor irregularities, a dirty throttle housing, and/or inefficient software calibration — that may light a warning lamp and then bring on limp home mode. NHTSA's consequence statement is blunt: this resulted in a high number of vehicles going into the limp home mode without need. For a V70 owner that reads as a wagon that abruptly restricts itself mid-drive with no genuine underlying failure. The campaign is categorized under Vehicle Speed Control and covers 170,099 vehicles campaign-wide across all included models. Owner notification began December 29, 2006, and the remedy is a software update, not a parts replacement.
Looking for P2135 on a different make?
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 5 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 5 Volvo models: C70, S60, S70, V40, V70.