{"nhtsa_id":10157606,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-04-08","date":"2013-11-29","document_id":"TT 20-13-04","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"Tech Tips (3.6L ? MIL ON with DTCs P2400, P2404): This document informs for concerns of MIL ON and P2400/P2404. This can be caused by the change over valve on the water pump. The water pump has a vacuum controlled servo to control the flow of coolant. If the diaphragm fails, coolant can get into the vacuum supply line for the LDP pump. Vacuum test the port on the water pump. If it will not hold vacuum, replace the water pump and the vacuum supply line as necessary and retest operation.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10157606-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10157606-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10157606","components":[{"id":"engine","name":"Engine","parent":null}],"codes":["P2400","P2404"],"topics":[],"vehicles":[{"make":"VOLKSWAGEN","model":"TOUAREG","year_from":2011,"year_to":2014,"match":"exact","vehicle_ids":["2011_volkswagen_touareg","2012_volkswagen_touareg","2013_volkswagen_touareg","2014_volkswagen_touareg"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}