Powertrain, generic (extended)

P2754 Transmission Fluid Cooler Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2754 reports that the drive line to the transmission fluid cooling actuator sits at too low a voltage, which in practice means a short to ground or a heavily loaded output. The module then cannot switch the coolant valve or cooler control as intended, and depending on design the valve may remain permanently open or closed. No manufacturer documents P2754 publicly. Audi applies the neighbouring open-circuit code P2753 to the cooling valve on the 2023 Q7 and SQ7, which shows where the fault sits; CARB requires output components to be monitored for shorts as well as opens. Typical culprits are chafed insulation touching the body, water in the connector or a shorted winding. Many output stages shut themselves off to protect against overload.

Likely causes

Control wire chafed through and shorted to ground
Water or coolant in the valve connector
Shorted turns in the valve coil

Symptoms

  • Check engine lamp on
  • Fluid temperature higher or lower than normal for the conditions
  • Usually no change in shift behaviour

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

trans fluid cooler valvewiring harness

Related codes

P2753P2755P0218

References: law.cornell.edu, static.nhtsa.gov.