Powertrain, generic (extended)

P240B EVAP System Leak Detection Pump Heater Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P240B covers a heater control line of the leak detection pump that is held at too low a voltage, which in practice means a short to ground on the wire or inside the module. Per VW's 2014 data books for the Golf and Touareg, the code appears when the heater signal falls below roughly 2.74-3.26 V. Land Rover lists P240B-00 in SSM71298 (LR4, Range Rover Sport L320) and SSM69118 (Range Rover L405, Range Rover Sport L494) and, once wiring is ruled out, has the DMTL pump replaced and returned. Maserati's sheet MAS002203 includes P240B for its DMTL models from MY17 and asks for the 12 V supply and connector to be checked first. Compared with P240A the circuit is closed but grounded; P240C is the over-current case. Drivability is not affected.

Likely causes

Heater wire shorted to ground near the pump
Internal fault in the DMTL pump module (Land Rover replaces the pump)
Moisture in the connector creating a path to ground

Symptoms

  • Check engine light
  • EVAP readiness not completed

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–500
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

P240AP240CP2401

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.