Cylinder 5 Injector Circuit Low
The P0273 code indicates that the powertrain control module (PCM) has detected a low voltage or resistance condition in the electrical circuit for the fuel injector on cylinder 5. This typically means the injector's electrical circuit is shorted to ground, has excessive resistance, or the injector itself is faulty. The PCM monitors the injector driver circuit and sets this code when the voltage is below a specified threshold during the injector's activation.
01. Most Common Causes
- Faulty fuel injector on cylinder 5
- Open or shorted wiring in the injector circuit
- Poor electrical connection at the injector connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine misfire on cylinder 5
- Rough idle or hesitation
- Check Engine Light illuminated
- Reduced fuel economy and performance
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for other related codes.
Step 2: Visually inspect the injector wiring and connector for damage, corrosion, or loose connections.
Step 3: Measure resistance of the injector (typically 12-16 ohms) using a multimeter; compare to specifications.
Step 4: Perform a continuity test on the injector circuit from the PCM to the injector connector.
Step 5: If wiring and injector are okay, test the PCM output with a noid light or oscilloscope.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine misfire, reduced performance, and potential damage to the catalytic converter due to unburned fuel.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, depending on whether the injector needs replacement and labor rates. Diagnostic fees may be additional.