P2755

P2755 - Transmission Fluid Cooler Control Circuit High

Possible Symptoms

• Reduced heat output
• Stalling, no-start, no communication to control module(s)

Possible Causes

• N82, N509, or N488 faulty
• Wiring or power supply to/from N82, N509, or N488 faulty

Possible Solutions

• Check N82, N509, or N488
• Check for applicable recalls or TPIs related to N82 failure resulting in coolant migration thorough the N82 solenoid connector resting in destroyed wiring harness(es)

Special Notes

• This page contains a photo from a CHHB 2.0T Mk7 Golf after N82 and harness failure: P1888
• The following pages contains a photos from a CDRA (4H) 4.2L A8L after N82 damaged the entire wiring harness:
  • 2 pin connector
  • 14 pin connector
  • That vehicle had P2755 stored in the TCM in conjunction with intermittent rough running and stalling concerns and various system too Rich fuel trim engine DTCs.
• When found in any number of 2011-2013 model year vehicles make sure to check for open recalls and TPIs for noted issues. These are just a few documents that were published:
  • NAR (North American Region) 2011-2013 model year Audi A8
    • Recall Service Action Code: 80B8
      • https://static.nhtsa.gov/odi/tsbs/2016/MC-10128034-9999.pdf NHTSA
    • TPI 2033806 suggests checking/replacing N82, N509, or N488 as needed in addition to any damaged harnesses. Inspect ECM, TCM and HVAC connection.
      • https://static.nhtsa.gov/odi/tsbs/2015/SB-10058574-8951.pdf NHTSA
      • https://static.nhtsa.gov/odi/tsbs/2016/MC-10096538-0699.pdf NHTSA
  • RoW (Rest of World) Audi A8 4.2L and 6.3L FSI
    • Recall Service campaign 80B8 (2042850)
  • RoW (Rest of World) A6 2.0TFSI
    • Service campaign 80B6 (2037311)
  • RoW (Rest of World) includes the A4 Saloon and Avant, A5 and Cabriolet, A6, A7, A8 and Q7
    • TPI 2033325/2 suggests checking/replacing N82, N509, or N488 as needed in addition to any damaged harnesses.