About this part
The 06J115105AC oil pump is the genuine OEM complete engine oil pump and balance shaft assembly for the Volkswagen Group EA888 Gen 1 and Gen 2 1.8 and 2.0 TSI / TFSI engines, the chain-driven family fitted to the Golf GTI, Passat, CC, Tiguan, Audi A3, A4, A5, TT, Skoda Octavia and SEAT Leon. On these engines the pump is not a stand-alone part: it sits inside the balance shaft module and shares its drive, so one casting carries the oil pump rotors, the two counter-rotating balance shafts and the chain sprocket. It is a genuine OEM-quality part, brand new, supplied as one ready-to-fit assembly, for workshops and owners chasing low oil pressure, a vibration that was not there before, or a rattle from the sump that grows with engine speed.
oil pump — complete engine oil pump assembly with integrated balance shaft module for EA888 Gen 1 and Gen 2 1.8 / 2.0 TSI and TFSI engines; direct replacement for 06J115105AB, 06J115105AG and 06J115105T, and the earlier numbers in the 06J115105 series.
OE/OEM Part Number:
06J115105AB, 06J115105AC, 06J115105AD, 06J115105AG, 06J115105AH, 06J115105N, 06J115105T
One casting, two jobs: why this part fails the way it does
What it does. The assembly is bolted under the crankshaft inside the sump. Oil is drawn through the pickup strainer and pressurised by the pump rotors, then fed to the main and rod bearings, the camshaft bearings, the hydraulic camshaft adjuster, the chain tensioner and the turbocharger. The same casting carries the two balance shafts, which spin at twice crankshaft speed in opposite directions and cancel the second-order vibration that a large four-cylinder engine produces. Both jobs share one drive chain and one housing, and that is why a failure in either half takes the other with it.
Failure one: oil pressure falls away. Long oil-change intervals and city driving load the pickup strainer with sludge, so the rotors run against a restricted inlet and wear. Delivery drops first at hot idle: the red oil pressure lamp flickers at traffic lights or on a hot restart, the top end rattles for a second after a cold start, and the camshaft adjuster — the furthest component from the pump — begins to rattle or to store a correlation fault. Left alone, the wear reaches the balance shaft bearings, which are fed from the same gallery.
Failure two: the balance shaft bearings seize. This is the failure that ends engines. The balance shaft bearings are plain bearings fed at low pressure; when they pick up, the shaft stops turning, and because the shaft is driven through the same chain as the pump, it stalls or snaps the drive. Oil pressure goes to zero within seconds while the engine is still running at speed. Owners usually describe a sudden rattle, then the pressure warning, then the engine stopping. Any engine that has run with a seized balance shaft needs the bearings and the oil circuit checked before a new assembly goes in.
Failure three: vibration that was not there before. Worn balance shaft bearings or a chain that has jumped a tooth let the shafts run out of phase. The engine then develops a boom or drone at a specific rpm band — felt through the floor and the steering wheel rather than heard — that no mount replacement cures. If the module has been off before and the timing marks were not lined up on refitting, the same symptom appears immediately.
Why a complete assembly, not a pump only. The pump rotors cannot be renewed inside the module without disturbing the balance shaft preload, and a rebuilt module with reused bearings simply moves the failure downstream. This assembly arrives brand new, with the rotors, the shafts and the sprocket at manufactured clearances, so the whole chain-driven unit is renewed in one operation.
Symptoms, diagnosis and installation
• Typical symptoms — oil pressure warning at hot idle or on deceleration, upper-end rattle in the first seconds after a cold start, a growl or whine from the sump area that rises with rpm, a new boom or drone in a narrow rpm band, camshaft adjuster rattle and correlation faults, and in the worst case a sudden loss of pressure followed by the engine stopping.
• Confirm it before ordering — fit a mechanical gauge in place of the pressure switch and compare hot idle and 2000 rpm readings with the workshop figure. Check oil level and condition first: sludge or a collapsed pickup mimics a worn pump, and overfilled or aerated oil gives false low readings. Drain the oil through a strainer and look for bearing material — yellow metal flakes mean the balance shaft bearings are already gone and the whole circuit needs inspection. Inspect the drive chain and tensioner at the same time, and read the stored faults: camshaft correlation and oil pressure switch codes usually travel together on this engine.
• Installation notes — drain the oil, remove the sump and the pickup tube, unbolt the module from the block and lower it square so the shafts do not catch on the bores. Clean the mating face and the oil galleries, fit the new assembly with new seals and O-rings, and line up the balance shaft timing marks with the crankshaft before the chain goes on — this is the single most common mistake on this job, and an out-of-phase module produces a vibration that will not go away. Renew the drive chain, tensioner and guide rails as a set; refitting a stretched chain to a new module wears the new sprocket and can jump. Prime the pump by filling the pickup cavity with clean oil, torque the mounting bolts evenly to the published figure, refill with the correct grade, crank until pressure builds and then run a full warm-up. Change oil and filter again after the first short run to flush out debris, and clear the stored faults.
• Fitment caution — the EA888 was built in three generations and the pump, the balance shaft module and the drive layout all changed. This 06J115105AC assembly is for the Gen 1 and Gen 2 chain-driven 1.8 and 2.0 TSI / TFSI with the module under the crankshaft. It is not the later Gen 3 pump, and it is not the 06H115105 pump used on the late Gen 2 engines with a separate balance shaft carrier. Confirm the engine code on the vehicle data sticker or by VIN decode, or send us a photo of the old assembly before ordering.
Fitment
The 06J115105AC assembly is fitted to the EA888 Gen 1 and early Gen 2 engines — the chain-driven 1.8 and 2.0 TSI / TFSI family with the balance shaft module bolted under the crankshaft. The engine code, not the model name, is the reliable check: VW reused the same model names across three generations with three different pumps, so confirm yours on the vehicle data sticker, the timing cover label or a VIN decode before ordering. The table below lists the usual applications.
| Make | Model | Years | Engine |
|---|---|---|---|
| VW | Golf VI / GTI, Golf V GTI, Jetta V / VI | 2008 – 2013 | 1.8 / 2.0 TSI — CDAA, CDAB, CCZA, CCZB, CAWB |
| VW | Passat B6 / B7, CC, Passat CC | 2008 – 2014 | 1.8 / 2.0 TSI — CCZA, CCZB, CCTA, CBFA, CAWB |
| VW | Tiguan I, Eos, Scirocco III, Beetle | 2008 – 2014 | 2.0 TSI — CCZA, CCZB, CAWB, CCTA |
| Audi | A3 8P, TT 8J, A4 B8, A5 8T, Q5 8R | 2008 – 2013 | 1.8 / 2.0 TFSI — CDAA, CDHA, CAEA, CAEB, CDNC |
| Audi | A6 C6 / C7 2.0 TFSI | 2009 – 2013 | 2.0 TFSI — CDNB, CAEB |
| Skoda | Octavia II / RS, Superb II, Yeti | 2009 – 2013 | 1.8 / 2.0 TSI — CDAA, CDAB, CCZA |
| SEAT | Leon II Cupra, Altea, Exeo, Toledo | 2009 – 2013 | 1.8 / 2.0 TSI — CDAA, CDAB, CCZA, CCZB |
Shipping and packing
Orders leave within one to two working days of cleared payment, packed in a foam-lined box with the module braced so the shafts, the sprocket and the sealing face arrive undamaged. This is a heavy, bulky part and it is shipped as one unit — the balance shafts are inside the housing and must not be supported by the sprocket in transit. Tracking is emailed when the parcel is handed to the carrier. Customs charges, where they apply, are the buyer’s responsibility.
Condition & warranty
Brand new, twelve months warranty against manufacturing defects covering the assembly as supplied. The warranty does not cover damage from oil starvation caused by a blocked pickup or the wrong oil grade, from a drive chain and tensioner that were not renewed with the module, from a module fitted without the balance shaft timing marks aligned, or from incorrect installation torque. If a part arrives faulty, send us photos and the fault scan before returning anything.
Wholesale
Tiered pricing for 1 pc, 5 pcs and 20 pcs is shown below. Workshops and resellers servicing EA888 engines should ask for a combined quote — we price mixed orders of oil pumps, balance shaft kits, timing chain kits, tensioners and sump seals together.
