P0122 on Volvo: How to Diagnose & Fix
Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input
2 Volvo models · 2 documented issues · 2 critical · $250-$800 repair
P0122 on Volvo by model: symptoms, diagnosis and fix
The electronic throttle module (ETM) on S40/V50 models with the 2.4L non-turbo (B5244S) and early T5 engines fails due to internal solder joint cracking from thermal cycling. The ETM controls the throttle blade electronically, and when it fails, the engine enters limp mode with severely limited power or refuses to rev above idle. The issue primarily affects pre-2008 models, as Volvo updated the ETM design. Volvo issued an extended warranty program for the ETM on affected models. The ETM failure is distinct from the P2 platform (older S60/V70) ETM issue but has similar symptoms.
Common Symptoms
- Check engine light with throttle position codes (P0121, P0122, P0123)
- Engine enters limp mode with limited power
- Engine won't rev above 2,000-2,500 RPM
- Hesitation or surging during acceleration
- Engine stalling at idle
How to Fix
Replace the electronic throttle module (ETM). Updated Volvo part 30711552 or 31216665 depending on engine type. Bosch aftermarket units are also available. Clear fault codes after replacement and perform throttle body adaptation using VIDA diagnostic tool. Check for Volvo extended warranty coverage, which covered the ETM replacement for up to 10 years on some model years. The repair is straightforward - the ETM bolts to the intake manifold and can be replaced in under an hour.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Volvo 31216327 non-turbo five-cylinder throttle body
replace a scan-data-confirmed internal throttle-body failure on the non-turbo gasoline branch Fitment/availability: Applicable Volvo S40 P1 non-turbo five-cylinder gasoline branch using OE 31216327; confirm VIN, engine code and installed…
- Genuine Volvo 30711552 T5 fuel-injection throttle body
replace a scan-data-confirmed internal T5 throttle-body failure after boost-control and wiring faults are excluded Fitment/availability: Applicable 2004.5-2011 Volvo S40 P1 T5 gasoline branch using OE 30711552; confirm VIN, B5254T engine…
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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.
Common Symptoms
- Check engine light with reduced engine power message
- Car enters limp mode (limited to ~30 mph)
- Stalling at idle or low speed
- Rough or surging idle
- Throttle unresponsive or delayed
How to Fix
Replace the ETM unit. Genuine Volvo replacement units have an updated design. Aftermarket options from Bosch are also available. Some specialists offer ETM rebuild services. Always reset the throttle adaptation values after replacement using a Volvo-compatible scanner (VIDA/DiCE).
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 early ETM sensor failure with a VIN-preprogrammed contactless unit Fitment/availability: 2001 Volvo S60 Turbo and applicable 2001-2002 S60 non-turbo Magneti Marelli ETM branch; VIN and original-modu…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
P0122 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 P0122 mean on a Volvo?
P0122 stands for "Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input." This generic code means the PCM detected a lower-than-expected voltage from the throttle position sensor (or accelerator pedal position sensor) 'A' circuit. This sensor tells the computer how far the throttle/pedal is open so it can manage fuel, timing, and on drive-by-wire systems the throttle itself. A low or lost signal can cause hesitation, surging, poor acceleration, stalling, or limp-home mode, so it should be diagnosed promptly. On Volvo it is documented across 2 models: S40, S60.
What are the most common causes of P0122?
The most common causes of P0122 are: Faulty throttle position sensor, Short to ground or open in the TPS signal circuit, Damaged or corroded TPS connector, Loss of reference voltage or bad ground to the sensor, Worn throttle body / TPS contacts, Chafed or pinched wiring harness, Faulty PCM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0122 on a Volvo?
Published repair estimates on Volvo range from $250 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 P0122 on a different make?
View P0122 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.