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Home / DTC / P0274 — Cylinder 5 Injector A Circuit High

P0274 — Cylinder 5 Injector A Circuit High

Detailed page for trouble code P0274.

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Code

P0274

Generic P — Powertrain

Cylinder 5 Injector A Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 18 EN: 25 RU: 20
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Page language: EN

Causes

  • Damaged or shorted wiring in injector 5 circuit (short to battery/ignition feed)
  • Corroded, loose, or contaminated injector connector or pins
  • Failed injector (stuck open, internal short, or excessive leakage/current)
  • Faulty ECU/PCM driver transistor for injector 5
  • Faulty power supply or relay feeding injectors
  • Poor or intermittent ground in injector circuit

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Rough idle or misfire on cylinder 5
  • Reduced engine power or hesitation
  • Increased fuel consumption and rough running under load
  • Possible hard starting or stalling

What to check

  • Read freeze frame and live data with a scan tool; note fuel trim, misfire counts, and injector command status for cylinder 5
  • Visually inspect injector 5 connector and wiring for damage, chafing, burns, or corrosion
  • Check related fuses, relays, and power feed circuits for the injector rail
  • Measure voltage at the injector connector with ignition ON and while cranking/engine running
  • Measure injector coil resistance (with battery disconnected) and compare to known/expected value
  • Perform an injector swap (swap cylinder 5 injector with another cylinder) to see if the DTC follows the injector

Signal parameters

  • Injector command: pulse-width modulated ground (or high-side) switching from ECM; duty depends on engine load
  • Idle/low-load: short pulse widths; high-load: longer pulse widths
  • Connector pin voltage (energized state): typically 0 V (if ECM grounds injector) to ~12 V on the supply side; drive side pulses between 0–12+ V depending on design
  • Injector coil resistance: typically in the range of ~1–16 Ω depending on low/high impedance design (check manufacturer spec)
  • Current draw: injector pulses can draw up to several amps briefly — abnormal continuous high current suggests internal short or short to power

Diagnostic algorithm

  1. Retrieve and record freeze frame data, misfire counts, and readiness status. Note any other related codes.
  2. Visually inspect wiring harness and connector for cylinder 5 injector. Repair obvious damage.
  3. With ignition OFF, disconnect injector 5 connector and inspect pins for corrosion, bent pins, or contamination. Repair/clean as needed.
  4. Measure injector coil resistance at the disconnected injector. Compare to specification or to a known-good injector from another cylinder.
  5. With connector disconnected, measure supply voltage at the injector supply pin with ignition ON — should show battery voltage. Check for short to power on the drive pin.
  6. Probe the drive pin with a multimeter or scope while cranking/starting to verify the ECM is commanding the injector and that the signal is switching (or use a noid light). Note if the drive is stuck high (indicating short to battery) or showing abnormal voltage.
  7. Swap the suspect injector with a known-good injector from another cylinder. Clear codes and run the engine: if the code moves to the other cylinder, the injector is likely bad.
  8. If code remains on cylinder 5 after swapping injectors, test the wiring harness for short to battery or ground and for open/ high-resistance connections. Repair harness as needed.
  9. If wiring checks good and replacement injector does not clear the issue, test or replace the ECM/PCM driver for the injector circuit (follow manufacturer procedures; bench testing may be required).
  10. After repairs, clear codes, perform functional tests and road test to verify repair. Confirm the DTC does not return and that drivability is restored.

Likely causes

  • Faulty injector or internal short in injector 5
  • Wiring short to battery/ignition feed at injector 5 connector
  • Corroded/poor connector or pin causing abnormal voltage
  • ECM output driver fault (less common)

Fault status

⚠️ Status
P0274 — Cylinder 5 Injector A Circuit High. ECM detected abnormally high signal/voltage in injector 5 circuit. MIL on.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0205 P0200 P0265 P0273
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