P1240
Injector Circuit Open Cylinder 4
P1240 is an OBD-II diagnostic trouble code meaning: Injector Circuit Open Cylinder 4. Common causes: malfunction of the injector of the 4th cylinder, open or short circuit in wiring. Estimated repair cost: $17–89.
Symptoms
- Unstable engine operation
- Misfire in cylinder 4
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
Causes
- Malfunction of the injector of the 4th cylinder
- Open or short circuit in wiring
- Poor contact in the injector connector
- Malfunction of the injector power supply relay
- Problems with the engine control unit
How to Fix
- Check the resistance of the injector of the 4th cylinder
- Inspect the wiring harness and connectors for damage.
- Check for voltage at the injector
- Test or replace the injector if necessary
- Check the operation of the injector relay
Related codes
Error P1240 by Vehicle Brand
FAQ
What does the P1240 code mean?
P1240 is an OBD-II diagnostic trouble code that indicates: Injector Circuit Open Cylinder 4
What causes a P1240 error code?
The most common causes of P1240 include: Malfunction of the injector of the 4th cylinder; Open or short circuit in wiring; Poor contact in the injector connector; Malfunction of the injector power supply relay.
How do I fix a P1240 diagnostic trouble code?
To fix P1240: Check the resistance of the injector of the 4th cylinder. Inspect the wiring harness and connectors for damage.. Check for voltage at the injector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1240?
Do not drive — repair immediately
How much does it cost to fix P1240?
The estimated repair cost for P1240 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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