P2135 on Volvo: How to Diagnose & Fix
Throttle/Pedal Position Sensor Voltage Correlation
5 Volvo models · 6 documented issues · 4 critical · $300-$800 repair
P2135 on Volvo by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Reduced power mode
- Check engine light
- Stalling
- Rough idle
How to Fix
Confirm ETM failure by scanning for throttle-related DTCs such as ECM-91A7/91B7 or generic P0121, P0221, and by checking live throttle angle signals for dropouts or mismatch between the internal position sensors. On the 2000-2004 V40, the fix is typically replacement of the Magneti Marelli electronic throttle module with an updated/rebuilt unit, followed by throttle adaptation/software initialization with Volvo VIDA or equivalent; inspect and clean the throttle body connector and wiring at the same time. If the car has severe idle instability or stalling, do not rely on cleaning alone, because worn internal contact tracks usually return quickly. Typical repair cost is about $500-$900 using a quality rebuilt ETM and adaptation, or $900-$1,400 with a new OEM unit and dealer programming.
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.
Common Symptoms
- Reduced power mode
- Stalling
- Check engine light
- Rough idle
- Throttle not responding
How to Fix
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- XeMODeX VO.1020 pre-programmed contactless Volvo electronic throttle module
replace a scan-data-confirmed internal S70 ETM sensor failure with a VIN-preprogrammed contactless unit Fitment/availability: 1999-2000 Volvo S70 Turbo and non-turbo Magneti Marelli electronic-throttle branch; VIN and original-module det…
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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.
Common Symptoms
- Warning lamp illuminates
- Wagon goes into limp home mode
- Restricted performance that appears unwarranted
How to Fix
Free dealer remedy: Volvo dealers install the current software upgrade onto the involved vehicles. Since this campaign dates to 2006, first confirm status by entering your V70's VIN at nhtsa.gov/recalls — that tells you whether 06V441000 is still open on your particular wagon. If it is, schedule the reflash at a Volvo dealer; Volvo's contact number for this recall is 1-800-458-1552.
Sources for this issue (1)
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.
Common Symptoms
- Reduced power mode
- Stalling
- Check engine light
- Intermittent throttle response
How to Fix
Confirm ETM failure by scanning for throttle-related Volvo/OBD-II codes such as ECM-91A7, ECM-91B7, P0121, P0221, or limp-home faults, then compare live throttle angle and pedal position data for erratic readings. On 1999-2002 V70 models with the Magneti Marelli electronic throttle, the proper repair is replacement with the updated contactless ETM or a professionally rebuilt unit, followed by software download/ETM adaptation using VIDA/DiCE or dealer-level programming. Also inspect and clean the throttle connector and check for wiring or vacuum issues before condemning the unit. Typical total cost is about $500-$900 for a rebuilt/upgraded ETM installed, or roughly $900-$1,400 with a new unit and dealer software/labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- XeMODeX VO.1020.36001822.00.24 pre-programmed contactless Volvo ETM
replace a diagnosed failed ETM with a pre-programmed contactless unit and return the original core Fitment/availability: 1999-2001 Volvo V70 turbo or 1999-2002 V70 non-turbo with a matching Magneti Marelli ETM/reference number and VIN-co…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Same ETM failure as other P2 platform Volvos. The early C70 (1998-2005, first gen) is most susceptible.
Common Symptoms
- Reduced power mode
- Stalling
- Check engine light
How to Fix
Confirm ETM failure by scanning for throttle-related DTCs such as P0121, P0221, P2135, or limp-home faults, then use live data to verify erratic throttle angle signals and inspect the ETM connector and wiring before condemning the unit. On 1999-2001 cable-throttle transition and early ME7-equipped C70 models, the usual fix is replacement of the original Magneti Marelli electronic throttle module with the updated Volvo unit or a professionally rebuilt contactless-sensor ETM, followed by software download/adaptation with VIDA/DiCE. Clean the throttle bore only if carbon buildup is minor; cleaning will not repair worn internal position sensors. Typical repair cost is about $700-$1,400 depending on whether a new OEM ETM, rebuilt unit, and dealer software reload are required.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- XeMODeX VO.1020 pre-programmed contactless Volvo electronic throttle module
replace a scan-data-confirmed internal ETM sensor failure with a VIN-preprogrammed contactless unit Fitment/availability: 1999-2004 Volvo C70 Turbo ME7 electronic-throttle branch; VIN and original module information are required for pre-…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
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.
Common Symptoms
- Warning lamp on the instrument cluster
- Sudden limp home mode while driving
- Reduced power / restricted throttle with no lasting fault
How to Fix
Dealers install the current software upgrade onto affected vehicles at no cost to the owner — the throttle control calibration is updated so the car stops falling back to limp home mode unnecessarily. Look up your S60's VIN at nhtsa.gov/recalls to see whether campaign 06V441000 is still listed as open on your car; if it is, any Volvo dealer can perform the update, and Volvo can be reached at 1-800-458-1552.
Sources for this issue (1)
P2135 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 P2135 mean on a 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 it is documented across 5 models: V40, S70, V70, C70, S60.
What are the most common causes of P2135?
The most common causes of P2135 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P2135 on a Volvo?
Published repair estimates on Volvo range from $300 to $800 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 P2135 on a different make?
View P2135 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.