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Service bulletins for the 2012 Volkswagen Jetta

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1483 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
TT2713012023-07-05. Service bulletin. ELECTRICAL SYSTEM. When diagnosing a generator charging concern, it is recommended to verify operation of the one way clutch located in the generator pulley (if equipped) before replacing generator assembly. To check the one way clutch, remove the belt from the generator pulley and use a trim removal tool to hold fan blades inside generator, as shown below. When attempting to turn pulley by hand with fan blades held, pulley should spin freely in only one direction. If pulley spins freely in both directions, the one way clutch has failed and should be replaced before continuing diagnosis.
TT2711022023-07-05. Service bulletin. ELECTRICAL SYSTEM. When diagnosing a low battery or no charging system concern, start by inspecting the SA1 200 amp fuse in the SA fuse block. DO NOT replace the generator. Perform a voltage drop test between threaded connections 508 and SA1 as shown in Figure 1. If the voltage drop is above .02V, disconnect the battery and remove the cables at the 508 connection and the SA1 connection. Check for continuity of the threaded plate connection between 508 and SA1. If fuse SA1 is found to have an open circuit, replace the fuse and check the threaded connections closely.
TT2614022023-07-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Disconnect both O2 sensors (front and rear), start engine and let idle. Check MVB's 41/4 and 136/4 and verify have both changed from a 1 to a 0 (you may have to drive the car 4 miles to get them to reset to 0). Also a key cycle may be required for values to reset. This forces the ECM to re-learn the O2 sensor adaptation. Once MVB 41/4 and 136/4 read 0, re-connect the O2 sensors, road test and recheck for faults.
TT2613032023-07-05. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Use of aftermarket air filters such as cotton bed steel mesh or cone style, can cause the MAF sensor to not read accurately, affecting vehicle performance and critical monitoring functions for the diesel particulate filter. This can also result in premature DPF failure. Only use factory air filters. The use of aftermarket air filters is not supported as the system was designed and calibrated to work with factory air filters.
TT2613012023-07-05. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. When diagnosing ECM fault P2413 ?Exhaust Gas Recirculation System Performance?, pressure test turbo hoses for leaks and repair as necessary.
TT2413032023-07-05. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). When diagnosing a vehicle concern, and fault P130A ?Hide Cylinder? is found in the Engine Control Module (ECM), be aware that Engine Control Module (ECM) fault P130A ?Hide Cylinder? indicates a cylinder shut down and does not require diagnosis.
TB4813032023-06-26. Service bulletin. ELECTRICAL SYSTEM; STEERING. Poor Power Steering Assistance, DTCs 16344 014, 16353 014, 16355 014, 02614 014 Stored in Power Steering Control Module J500
TB4813022023-06-26. Service bulletin. ELECTRICAL SYSTEM; STEERING. Poor Power Steering Assistance, DTCs 16344 014, 16353 014, 16355 014, 02614 014 Stored in Power Steering Control Module J500
TT9714022023-06-13. Service bulletin. ELECTRICAL SYSTEM. The DLC is intended for use with diagnostic scan tools and by emissions testing stations. However, aftermarket devices (i.e., drive data recorders) that connect to the DLC have now become available.
TT9614022023-06-13. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. When replacing the complete vehicle lock set (all vehicle keys and lock cylinders) for any reason, be aware that the ?Adapt keys? test plan will not allow the new keys to adapt to the vehicle. Instead, perform the test plan for ?New identity?. During this test plan, make the appropriate selection to indicate only the lock set has been replaced, as shown below in figures 1 and 2.
TT9612072023-06-13. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER; ELECTRICAL SYSTEM. All keys must be present during key adaptation. Immobilizer reader coil is ALWAYS located in the steering column. DO NOT remove Start/Stop button mounted in center console to access reader coil.
TT9113062023-06-13. Service bulletin. ELECTRICAL SYSTEM. If the radio is switching to the Bluetooth audio selection whenever a paired phone makes any sound, such as typing or an incoming email or text message, check the BT-Audio Autoplay setting in the Media Setup menu as shown below. If BT-Audio Autoplay is on (checked), switch selection off and retest for concern. If radio software is 0016 or 0007, radio may require software update as per TB 91-13-05 (2031136) to allow BT-Audio Autoplay to switch off.
TT9113022023-06-13. Service bulletin. ELECTRICAL SYSTEM:WIRING:CONNECTORS/PLUGS:ACCESORY POWER OUTLET/JACK/PORT/USB/SAE/CIGARETTE LIGHTER; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. The Apple iPhone 5, iPad fourth generation, and iPod nano seventh generation use a proprietary ?Lightning? connector that is different than the 30 pin dock connector found on previous iPhone and iPod models.
TT911117a2023-06-13. Service bulletin. ELECTRICAL SYSTEM; PARKING BRAKE. Replacement RNS 510 radio/navigation units may be shipped in transportation safeguard mode and therefore will have no sound output. In order to switch the unit out of this mode, hold down the forward seek button, the back seek button, and the music button at the same time until the unit shuts down. Once the unit is powered back ?ON? the safeguard mode will be deactivated.
TT9111172023-06-13. Service bulletin. ELECTRICAL SYSTEM; PARKING BRAKE. Replacement RNS 510 radio/navigation units may be shipped in transportation safeguard mode and therefore will have no sound output. In order to switch the unit out of this mode, hold down the forward seek button, the back seek button, and the music button at the same time until the unit shuts down. Once the unit is powered back ?ON? the safeguard mode will be deactivated.
TT9111142023-06-13. Service bulletin. ELECTRICAL SYSTEM. The Bluetooth module has now been integrated into the navigation head unit on 2012-2013 vehicles with RNS 315 navigation part number 1K0 035 274 B or higher. The diagnosis for this system is similar to the 9W7 system. Technical Bulletin 91 11 09 (2026015) can be used for the diagnosis.
TT901302a2023-06-13. Service bulletin. ELECTRICAL SYSTEM. Under the ?Control Module? tab right click on address word ?17 Dash Board?. Open ?Control module OBD?. Click ?
TT9013012023-06-13. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; STEERING. Be aware that the daytime running light (DRL) indicator in the instrument cluster is only functional on vehicles equipped with right side steering wheel controls. Indicator may be visible in instrument cluster on vehicles without right side steering wheel controls, but will not function.
TT9011072023-06-13. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. The instrument cluster illumination is controlled by a photocell inside the cluster. If an illumination concern is suspected, darken the area over the photocell, or use a flashlight to simulate natural light changes, to see how the illumination is affected. See figure 1 below for example of the photocell location based on a 2011 Jetta sedan. Location can change based on model.
TT871101a2023-06-13. Service bulletin. ELECTRICAL SYSTEM. To set basic setting on the Climatic control module after replacement for fault code 00898 follow steps below
TT8711012023-06-13. Service bulletin. ELECTRICAL SYSTEM. After A/C control module J301 is replaced, fault 00898-005 ?Activation A/C Compressor No or Incorrect Basic Settings? may be stored. GFF test plan does not perform Activation A/C Compressor Basic Setting. To perform basic setting and resolve this fault, follow steps below
TB2716012023-05-22. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR. Generator replacement.
TB1916012023-05-22. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Electric coolant fans continue to run after ignition is switched off.
VOS-23-082023-05-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This document outlines updates to the ODIS diagnostic software. Updates include corrected diagnostic test plans for the stated vehicles.
V2719022033978102023-04-06. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR. Generator Replacement

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.