TransmissionGeneric OBD-II codeUrgency: Garage soon
Code P0841: gearbox oil pressure sensor A out of range
P0841 means: transmission fluid pressure sensor or switch “A”: circuit range or performance out of expected limits.[1][2][3] The gearbox oil pressure sensor (TFP) is in the valve body or bolted to the gearbox, and it converts hydraulic pressure into an electrical signal for the gearbox control unit. That signal is used to measure the working pressure and to detect gear changes, according to CódigosDTC, and the control unit uses it to control outputs such as the pressure solenoids, according to TroubleCodes.net.[1][2]
What code P0841 means
The gearbox oil pressure sensor (TFP) is in the valve body or bolted to the gearbox, and it converts hydraulic pressure into an electrical signal for the gearbox control unit. That signal is used to measure the working pressure and to detect gear changes, according to CódigosDTC, and the control unit uses it to control outputs such as the pressure solenoids, according to TroubleCodes.net.[1][2]
P0841 is stored when the signal from input “A” does not match the normal voltages the control unit has stored, that is, when the control unit detects incorrect performance of the sensor circuit. The control unit powers the sensor with a reference voltage (usually 5 V) and receives a signal that varies with pressure.[1][2]
It is a generic code of the standard: DTCSearch classifies it as a generic gearbox code controlled by ISO/SAE, so it means the same on any brand. P0846 is the same fault on sensor or switch “B”, because some gearboxes have several.[3][4][5]
Original definition (SAE J2012): Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance[1][2][3]
Codes from the same family
They indicate the same problem in a specific cylinder, bank or sensor. Causes, symptoms and diagnosis are those on this page.
Causes of P0841 and its family
From most to least likely, according to the sources.
- 1Faulty pressure sensor (TFP).[1][2]
- 2Sensor circuit fault: open signal, short to voltage or short to earth, damaged cables or connectors.[1][2]
- 3Faulty control unit or one needing reprogramming (TroubleCodes.net describes it as a rare cause).[2]
- 4Internal mechanical fault in the gearbox that alters the pressure the sensor measures.[1][2]
Symptoms
- Engine fault warning light on; other codes may be stored.[1][2]Engine warning light: faults that cause it
- Abrupt shifts.[1][2]Gears will not engage: faults that cause it
- Gearbox slipping.[1][2]
- The car goes into limp mode.[2]Limp mode: faults that cause it
- Higher fuel consumption.[1]Uses more fuel: faults that cause it
How to diagnose P0841
In order: from the most likely and cheapest to check to the most expensive.
- 1Check the gearbox oil level and condition and repair any cause of low level (leaks). Check the model's technical bulletins and deal first with the other stored codes.[1][2]
- 2Locate the sensor and visually check the sensor, the cables and the connectors: repair or replace burnt cables or corroded connectors.[1][2]
- 3With the ignition off and the connector disconnected, measure the resistance between signal and earth and compare it with the manufacturer's figure with no pressure applied. If it is infinite (OL) or outside the range, the sensor is faulty.[1][2]
- 4With the ignition on, check that about 5 V reference reaches the sensor connector. If it does not, check the continuity of the reference wire to the control unit, the sensor earth and the return signal, and finally the reference voltage at the control unit itself.[2]
- 5Only if the wiring is good and the control unit supplies the reference does TroubleCodes.net point to an internal gearbox fault or the control unit (rare): then follow the manufacturer's procedure.[2]
Can I keep driving with P0841?
Garage soon
None of the sources give a severity for P0841. TroubleCodes.net comments that gearbox problems need prompt attention, since the causes range from a simple oil change to replacing the whole gearbox, and the symptoms it cites (abrupt shifts, slipping and limp mode) justify not leaving it. The prudent course is to take the car to a workshop as soon as any symptom is noticed.[2]
Documented faults related to P0841
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Automatic gearbox (torque converter and CVT): the most serious faults by engine and car
- Critical severityFrequency: CommonMultitronicWear of the variator chain and conesYes: the variator uses a chain of more than 1,000 links between two pairs of cones that wears with mileage, especially if the oil is not changed regularly. Gebrauchtwagenberater ties the gearbox's reputation to "numerous total failures"; Schaeffler/LuK sells a kit to repair the chain.
- Critical severityFrequency: Common2.0 CDI (OM640)Costly failure of the Autotronic (CVT) automatic gearboxYes: the Autotronic continuously variable gearbox, optional on the 180 CDI and 200 CDI, is the problem cited most by owners of the 140 hp version (24 of 114 testimonies) and a fault hotspot according to the ADAC up to 2006. A German source recommends avoiding it and choosing the manual gearbox.
- High severityFrequency: CommonMultitronicControl unit (TCU) failure and limp modeYes: the multitronic control unit, especially in the 01J code (up to 2007), is one of its best-documented weak points. Overheating with oil seeping into the control unit causes fault warnings and limp mode and, if ignored, can end up damaging the gearbox itself.
- High severityFrequency: Common7G-Tronic / 9G-TronicConductor plate and speed sensor failure (limp mode)Yes: one of the most cited weak points of the 7G-Tronic (722.9) is the internal conductor plate, which integrates the turbine, output and intermediate-shaft speed sensors; if it fails it can trigger a limp mode with delayed shifts or harsh jerks, although it does not always require replacing the whole gearbox.
- High severityFrequency: CommonAudi A6 C6Wear and failures of the Multitronic automatic gearbox on front-wheel-drive versionsYes: on front-wheel-drive versions with the Multitronic (CVT) gearbox, gebrauchtwagenberater.de documents jerking when pulling away that can progress to complete failure, especially on older cars; fiches-auto.fr adds selector lock-ups and torque converter breakages. The quattro versions, with the Tiptronic gearbox, do not share this problem.Repair (garage): €1,000Appears at around 120,000 km
- High severityFrequency: CommonMINI Cooper R50Faults in the CVT automatic gearbox, the manual gearbox and the clutchAccording to the reports collected by fiches-auto.fr, the Mini R50 accumulates 22 gearbox mentions and 32 clutch mentions, and the CVT automatic variant is described as fragile and 'to be avoided'. Wikipedia confirms that the CVT and the manual gearboxes were fitted depending on the year.
Gearbox mechatronic unit: the most serious faults by engine and car
- High severityFrequency: Very frequentDSG7 DQ200Mechatronic unit failure: pressure accumulator, pump and cracked housingYes: the mechatronic unit is the DQ200's most cited weak point. Its pressure accumulator and hydraulic pump can fail because of a housing design defect, with fault warnings, limp mode or loss of drive; Volkswagen has acknowledged the problem with service actions and software updates.Repair (garage): €600–€2,200
- High severityFrequency: CommonMultitronicControl unit (TCU) failure and limp modeYes: the multitronic control unit, especially in the 01J code (up to 2007), is one of its best-documented weak points. Overheating with oil seeping into the control unit causes fault warnings and limp mode and, if ignored, can end up damaging the gearbox itself.
- High severityFrequency: Common7DCTJerking, hesitation and mechatronic faults at low speedYes: several sources based on owner accounts name the 7DCT as one of the most-cited weak points of these models, with jerking and hesitation on pulling away, missing gears (sometimes reverse) and, on the most affected diesels, more than a third of the accounts mentioning gearbox faults.
- High severityFrequency: Common7G-Tronic / 9G-TronicConductor plate and speed sensor failure (limp mode)Yes: one of the most cited weak points of the 7G-Tronic (722.9) is the internal conductor plate, which integrates the turbine, output and intermediate-shaft speed sensors; if it fails it can trigger a limp mode with delayed shifts or harsh jerks, although it does not always require replacing the whole gearbox.
- High severityFrequency: CommonAudi Q5 IAudi Q5 S tronic gearbox faults: jerking, vibrations and mechatronicsThe S tronic gearbox and the transmission account for 65 and 48 testimonies out of 322 on fiches-auto.fr, with jerking, vibrations and gear selection faults; there are cases of mechatronic unit replacement at 105,000 km. No official campaign found.Appears at around 48,000 km
- High severityFrequency: OccasionalMazda CX-60Transmission control module (TCM) software: the engine and electric motor clutch may not re-engage after brakingYes: campaign AR043A corrects a software fault in the transmission control module (TCM) which, after braking, can stop the clutch between the engine and the electric motor from re-engaging; the car may not respond to the accelerator. It is fixed by reprogramming the module at an authorised workshop.
Wiring, connectors and short circuits: the most serious faults by engine and car
- Critical severityFrequency: OccasionalBMW N62 / N63Additional turbo coolant pump with a risk of short circuit and fireIn 2011 BMW recalled 5, 6 and 7 Series, X5 and X6 models built between 2007 and 2011 because of the additional turbo coolant pump: moisture, a short circuit and, in extreme cases, a fire. In 2012 there was another campaign for a crack in the pump, with a more robust version.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Main relay of the power relay assembly (overheating and fire risk)Yes, on the first units: Hyundai and Kia recalled 2016–2018 Ioniq and Niro hybrids and plug-in hybrids because the main relay that connects the high-voltage battery could come loose, overheat and, in the worst case, cause a fire.
- Critical severityFrequency: Occasional1.6 GDi híbrido (Kappa)Clutch hydraulic actuator (HCA): leak or moisture with risk of short circuit and fireYes, this is the most documented hybrid system fault: the hydraulic actuator that engages the combustion engine with the hybrid assembly has had two recalls (2018 for a leak on the Niro and 2025 for moisture in its electronic board on the Niro, Ceed and XCeed PHEV), with a risk of short circuit and fire.
- High severityFrequency: Occasional1.3 TCeBlown fuel pump fuseOn the Renault Captur II and Clio V with the 1.3 TCe engine, a 20-amp fuse can blow and leave the car without an engine. According to L'argus, in April 2021 this fault still had no factory fix; the official service centre's diagnosis includes checking, and sometimes replacing, the catalytic converter.
- Critical severityFrequency: CommonRover 75Seat SRS connector fault with airbag and seatbelt warning light onAuto Express warns that the Rover 75's seat SRS connector can cause the airbags to fail, and dealers were fixing it with revised connectors. The Dutch APK inspection puts the airbag or seatbelt fault warning among the most frequent defects across almost all series.
- Critical severityFrequency: OccasionalAlfa Romeo GiuliettaShort circuit from badly routed wiring that can prevent gear shifting (KBA campaign, 2010-2015)Yes: according to Germany's KBA, on Alfa Romeo Giulietta cars built between 2010 and 2015 inadequate cable routing could cause a short circuit and, as a result, gear-shift failure.
Frequently asked questions
What does the TFP sensor measure?
The internal hydraulic pressure of the automatic gearbox. It converts it into an electrical signal that the gearbox control unit uses to measure working pressure and manage gear changes.[1][2]
What is the difference between P0841 and P0846?
P0841 refers to pressure sensor or switch “A” and P0846 to “B”. TroubleCodes.net gives P0846 the same causes and symptoms as P0841, and CódigosDTC notes that some gearboxes use several sensors of this type.[2][4][5]
What should I check first with a P0841?
The gearbox oil level and condition, and the model's technical bulletins. Then the sensor's cables and connector and its resistance with a multimeter, compared with the manufacturer's figure.[1][2]
Should I replace the sensor straight away?
No: the sources ask you to rule out the oil, the wiring and the reference voltage first. The sensor is replaced when its resistance measurement is outside specification or infinite.[1][2]
Will I pass the MOT with code P0841?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[6]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- P0841 - Problema de rango/rendimiento del sensor de presión del líquido de transmisión (TFP) ACódigosDTC · Technical documentation · consulted 31 October 2026 · in Spanish
- P0841 trouble code - Transmission fluid pressure (TFP) sensor/switch A range/performanceTroubleCodes.net · Technical documentation · consulted 31 October 2026
- P0841 - Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/PerformanceDTCSearch · Technical documentation · consulted 31 October 2026
- P0846 trouble code - Transmission fluid pressure (TFP) sensor B range/performanceTroubleCodes.net · Technical documentation · consulted 31 October 2026
- P0846 - Rango/rendimiento del circuito B del sensor/interruptor de presión de fluido de transmisiónCódigosDTC · Technical documentation · consulted 31 October 2026 · in Spanish
- Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish