P0201
High SeverityInjector Circuit Malfunction - Cylinder 1
Fuel System
P0201 — Instant Answer
Injector Circuit Malfunction - Cylinder 1
Severity: HIGH SEVERITY
Meaning: The fuel injector on cylinder 1 has a circuit fault. It may not be firing.
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. Faulty cylinder 1 injector (35-45% of cases)
- 2. Damaged wiring to injector 1 (10-25% of cases)
- 3. Corroded connector (10-25% of cases)
- 4. ECM driver failure (5-10% of cases)
Symptoms
- ⚠️Cylinder 1 misfire
- ⚠️Rough idle
- ⚠️Loss of power
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0201
- 1Check injector 1 connector
- 2Measure injector 1 resistance (compare to others)
- 3Check for power at injector
- 4Swap injector with another cylinder to confirm
OEM Procedures for P0201
P0201 affects the Fuel Injector. 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
OEM Diagnostic Flowchart
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A weak battery can mimic alternator or starter problems.
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A meter is the cheapest way to rule out a bad circuit fast.
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Repair guides, symptom pages, and wiring diagrams related to P0201.
OEM Manual Evidence
Browse →Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 4 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Related Symptoms
Browse →Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Related Codes
General fuel injector circuit fault. The ECM detected an issue with the injector driver circuit.
Cylinder 1 is misfiring — not firing properly. Could be spark plug, coil, injector, or compression issue on that specific cylinder.
Cylinder 2 injector circuit fault.
Frequently Asked Questions
- Can I swap injectors to test?
- Yes — swap cylinder 1 injector with another. If the code follows to the new cylinder, the injector is bad.
- Does P0201 always mean the injector is bad?
- Not always — check the wiring and connector first. A corroded or loose connector is a common cause.
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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