P0261
High SeverityCylinder 1 Injector Circuit Low
Fuel System
P0261 — Instant Answer
Cylinder 1 Injector Circuit Low
Severity: HIGH SEVERITY
Meaning: Low voltage in cylinder 1 injector driver circuit.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $40 - $150
Most common causes:
- 1. Short in injector wiring (35-45% of cases)
- 2. Failed injector coil (10-25% of cases)
- 3. ECM driver issue (5-10% of cases)
Common Causes
How to Diagnose P0261
- 1Check injector connector
- 2Measure injector resistance
- 3Check wiring for shorts to ground
- 4Replace injector if coil shorted
OEM Procedures for P0261
Engine Controls And Fuel - 2.7L - Diagnostic Information And Procedures (2 Of 4) Found 103 OEM service manual procedures.
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Engine Code Information Label - Fuel Injector Replacement Label
Showing 8 of 103 procedures
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Repair guides, symptom pages, and wiring diagrams related to P0261.
Related Codes
The fuel injector on cylinder 1 has a circuit fault. It may not be firing.
High voltage in cylinder 1 injector circuit. Usually open circuit.
Cylinder 1 is misfiring — not firing properly. Could be spark plug, coil, injector, or compression issue on that specific cylinder.
Frequently Asked Questions
- What is injector circuit low?
- It means the ECM sees low voltage/resistance in the injector circuit, often from a shorted injector coil.
- Can I test injector resistance?
- Yes — unplug the injector and measure with a multimeter. Compare to specs (typically 11-18 ohms).
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07