P240B code meaning
EVAP System Leak Detection Pump Heater Control Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P240B means
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.
P240B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P240B
- Check engine light
- EVAP readiness not completed
Common causes of P240B
- Most likelyHeater wire shorted to ground near the pump
- PossibleInternal fault in the DMTL pump module (Land Rover replaces the pump)
- Less likelyMoisture in the connector creating a path to ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pump heaterEVAP pump wiring
What each part of P240B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 0B | The exact fault in that area. |
What to do next
- Note P240B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P240B
What does P240B mean?
P240B means "EVAP System Leak Detection Pump Heater Control Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P240B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P240B fail an emissions test?
Yes, it can. P240B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P240B to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P240B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.