Error code

OBD2 P0273

OBD2P0273
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 5 Injector Circuit Low.

Severity

moderateThe vehicle can be driven, but performance will suffer. Addressing the issue is recommended.

Summary

P0273 indicates a low voltage issue with the fuel injector circuit for cylinder 5 in the engine.

Symptoms

  • Engine knock or pinging
  • Rough idle and lack of power, especially during acceleration
  • Reduced fuel economy

Common Causes

  • Faulty fuel injector (cylinder 5)
  • Corroded or loose electrical connectors in the circuit
  • Wiring harness issues between the fuel injector control module and cylinder 5
  • Faulty oxygen sensor or powertrain control module (PCM)

Diagnosis

  1. Inspect electrical connectors and wiring for corrosion or looseness.
  2. Use a voltmeter to check if power is reaching the fuel injector.
  3. Listen for clicking sounds from the fuel injector while the engine is running.
  4. Check other related OBD-II codes (P0325, P0301, P0275, P0272) for additional clues.

Fixes

  • Clean or replace the faulty fuel injector in cylinder 5.

FAQ

Can I drive with a P0273 code?

Yes, but expect reduced performance and potential engine knock. It's best to address the issue soon.

What causes a low voltage in the fuel injector circuit?

Common causes include faulty wiring, corroded connectors, or issues with the fuel injector itself.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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