The P0261: Cylinder 1 Injector Circuit Low refers to a problem where the injector circuit for Cylinder 1 is receiving low voltage. This issue could stem from a faulty fuel injector, problems with the wiring or connectors, or even a failure in the Powertrain Control Module (PCM). When this code appears, it suggests that Cylinder 1 is not receiving the proper electrical power, which can lead to misfires and reduced engine performance.
P0261 – Quick Overview
| Meaning | P0261: Cylinder 1 Injector Circuit Low |
| Is it serious? | Yes, this code can be serious as it can cause poor engine performance, misfires, and increased emissions. |
| Possible causes | – Low voltage in the injector circuit for Cylinder 1 – Faulty fuel injector for Cylinder 1 – Wiring or connector issues – Faulty PCM |
| How to diagnose? | – Measure the voltage in the injector circuit for Cylinder 1. – Inspect the fuel injector for Cylinder 1 for proper operation. – Check wiring and connectors for defects. – Replace or repair any faulty components. |
P0261 Meaning
The P0261: Cylinder 1 Injector Circuit Low code means that the injector circuit responsible for delivering fuel to Cylinder 1 is experiencing low voltage. This could lead to poor fuel injection and engine performance, as the cylinder may not be receiving the correct amount of fuel to function efficiently.
Step-by-step diagnostic guide
Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to see if any additional codes are present, as they may help identify related issues. | OBD-II Scanner |
| Measure Voltage in Cylinder 1 Injector Circuit | Use a multimeter to measure the voltage in the injector circuit for Cylinder 1. Compare the readings to the manufacturer’s specifications. | Multimeter, Manufacturer’s Specifications |
| Inspect Cylinder 1 Fuel Injector | Visually inspect the fuel injector for Cylinder 1 for any signs of damage or malfunction. | Flashlight, Safety Gloves |
| Check Wiring and Connectors | Inspect the wiring and connectors leading to Cylinder 1’s injector for any signs of wear, shorts, or disconnections. | Flashlight, Multimeter |
| Repair or Replace Faulty Wiring/Components | If any faulty wiring or components are found, repair or replace them to ensure a solid electrical connection. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM for any faults. If the PCM is suspected to be faulty, it may require reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After repairs, clear the P0261 code using the OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, scan the vehicle again to ensure the P0261 code has not returned. If it does, further diagnosis may be necessary. | OBD-II Scanner |
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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