Cylinder 11 Injector Circuit Low
The P0291 code indicates that the powertrain control module (PCM) has detected a low voltage or resistance condition in the electrical circuit of the fuel injector for cylinder 11. This typically means the injector circuit is drawing less current than expected, which can be caused by a faulty injector, wiring issues, or a poor electrical connection. The injector may not open properly, leading to insufficient fuel delivery to cylinder 11, causing misfires and reduced engine performance.
01. Most Common Causes
- Faulty fuel injector on cylinder 11
- Open or shorted wiring in the injector circuit
- Corroded or loose connector at the injector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine misfire on cylinder 11
- Rough idle or hesitation
- Check Engine Light illuminated
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0291 and check for other codes.
Step 2: Visually inspect the injector connector and wiring for damage or corrosion.
Step 3: Measure resistance of injector 11; compare to specifications (typically 12-16 ohms).
Step 4: Check for voltage and ground at the injector connector with the engine running.
Step 5: Perform a injector balance test or swap injectors to isolate the issue.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the misfire can damage the catalytic converter and cause poor performance. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost ranges from $150 to $400 depending on the cause. Injector replacement is typically $200-$350, while wiring repairs may be less.