Powertrain, generic (extended)

P240C EVAP System Leak Detection Pump Heater Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P240C flags the heater circuit of the leak detection pump at the high end: VW's 2014 Golf and Touareg books set it when the heater current exceeds about 2.2-4 A, which points to a shorted element or a line touching battery voltage. Jaguar's JTB00436 for the XJ (X351) quotes both P240C-00 and P240C-85, the 85 suffix marking a signal above range, among faults from water or ice in the DMTL filter; Land Rover's SSM69118 lists P240C-85 and SSM71298 P240C-00, each leading to a DMTL pump swap when nothing else is found. Maserati names P240C on its DMTL engines too. P240A means no current flows at all, P240B a grounded line. Without heating, the leak test can suffer in cold and damp weather; the car itself drives normally.

Likely causes

Shorted heating element in the pump module, often after water ingress
Heater control wire shorted to battery voltage
Faulty heater output stage in the engine control module

Symptoms

  • Check engine light
  • Other DMTL codes after frost or heavy rain

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–600
Time0.5–2 h

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

Parts involved

evap leak detection pump heaterevap pump wiring

Related codes

P240AP240BP2402

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