The P0291: Cylinder 11 Injector Circuit Low refers to an issue with the electrical circuit controlling the fuel injector for cylinder 11. This issue is often caused by a faulty injector, an open or shorted wiring circuit, or a malfunctioning injector driver in the ECM. When this code appears, it can result in engine misfires, poor performance, and higher emissions.
P0291 – Quick Overview
| Meaning | P0291: Cylinder 11 Injector Circuit Low |
| Is it serious? | Yes, this code is serious and can cause engine misfires, poor performance, and increased emissions. It should be addressed to avoid further engine issues. |
| Possible causes | – Faulty cylinder 11 injector – Open or shorted circuit in the wiring – Faulty injector driver in the ECM |
| How to diagnose? | – Check the wiring and connectors for the cylinder 11 injector – Test the cylinder 11 injector for proper resistance – Inspect and test the ECM for fault codes related to injector driver |
P0291 Meaning
The P0291: Cylinder 11 Injector Circuit Low code means that the signal sent to the fuel injector for cylinder 11 is lower than expected. This could be due to an open or shorted wiring circuit, a malfunctioning injector, or an issue with the injector driver in the ECM. When cylinder 11’s injector is not functioning properly, it can lead to poor fuel delivery, engine misfires, and rough idling.
Step-by-step diagnostic guide
Here is a step-by-step guide to troubleshoot and repair the P0291 error:
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any other codes that might help pinpoint the issue more precisely. | OBD-II Scanner |
| Inspect Cylinder 11 Injector | Visually check the cylinder 11 injector for any signs of damage, disconnection, or corrosion. | Flashlight, Safety Gloves |
| Test the Injector | Use a multimeter to test the resistance of the cylinder 11 injector and compare it to manufacturer specifications. | Multimeter, Manufacturer’s Specifications |
| Inspect Wiring and Connectors | Check the wiring and connectors for cylinder 11 for any signs of wear, corrosion, or disconnections. | Flashlight, Multimeter |
| Repair/Replace Wiring | Repair or replace any damaged wiring or connectors to restore proper electrical flow. | Wire Strippers, Electrical Tape, Replacement Wires |
| Inspect the ECM | Check the ECM for any faults related to the injector driver and reprogram or replace it if necessary. | OBD-II Scanner, Multimeter |
| Clear Code and Test Drive | After repairs, clear the P0291 code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to make sure the P0291 code does not return. | OBD-II Scanner |
By following this guide, you can diagnose and resolve the P0291 code, ensuring proper injector function for cylinder 11 and improving engine performance.
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko