Cylinder 6 Injector Data Incompatible
The P2691 code indicates that the Engine Control Module (ECM) has detected a mismatch between the expected and actual performance data from the fuel injector on cylinder 6. This can be caused by a faulty injector, wiring issues, or a problem with the ECM itself. The injector may be delivering incorrect fuel quantity or timing, leading to poor engine performance.
1. Most Common Causes
- Faulty fuel injector on cylinder 6
- Wiring or connector issues at injector 6
- ECM software or hardware malfunction
2. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Reduced fuel economy
- Loss of power or hesitation
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to read and record freeze frame data.
Step 2: Inspect wiring and connector at cylinder 6 injector for damage or corrosion.
Step 3: Swap injector 6 with another cylinder and see if the code follows.
Step 4: Check fuel pressure and injector pulse with a multimeter or oscilloscope.
Step 5: If all else fails, update ECM software or replace ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine damage and poor performance. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and up to $200-$400 for injector replacement, depending on labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.