The P2691: Cylinder 6 Injector Data Incompatible code indicates that the data for the fuel injector in Cylinder 6 is incorrect or incompatible with the ECM/PCM. This issue may occur if the injector was replaced without proper programming, there are faulty calibration data, or the ECM/PCM has issues. Proper programming of injector data is crucial to ensure correct fuel delivery, which impacts engine performance and emissions.
P2691 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2691: Cylinder 6 Injector Data Incompatible |
| Is it serious? | Yes, as incorrect injector data can cause poor fuel delivery, engine misfires, reduced performance, and increased emissions. |
| Possible causes | – Incompatible or faulty injector data – Injector replacement without proper programming – Faulty ECM/PCM or data issues |
| How to diagnose? | – Check injector data for Cylinder 6 – Verify compatibility and programming – Inspect ECM/PCM for faults – Reprogram or replace components as needed |
P2691 Meaning
The P2691: Cylinder 6 Injector Data Incompatible code indicates that the ECM/PCM detects an issue with the data being used to control the injector in Cylinder 6. This issue is typically caused by an improperly programmed or replaced injector, incompatibility between the ECM/PCM and the injector, or corrupted calibration data. Accurate injector calibration is vital to ensure optimal fuel delivery, leading to proper combustion and efficient engine operation.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to see if there are any other related codes that might point to issues affecting fuel injectors or ECM/PCM. | OBD-II Scanner |
| Check Injector Data for Cylinder 6 | Verify the calibration data for the injector in Cylinder 6. Ensure that the data is correct, the part number matches, and that it meets the manufacturer’s specifications. | Manufacturer’s Service Information, Diagnostic Tool |
| Verify Compatibility and Programming | Make sure the injector installed in Cylinder 6 has been correctly programmed and is compatible with the ECM/PCM. Proper calibration must be done after replacement. | Manufacturer-Specific Calibration Tool |
| Inspect ECM/PCM | Inspect the ECM/PCM for faults related to data retention or communication with the injector. Verify if there are internal errors preventing proper calibration. | Diagnostic Scanner, Specialized PCM Testing Tool |
| Check Wiring and Connections | Inspect all wiring and connectors leading to Cylinder 6’s injector for any signs of damage, corrosion, or loose connections. Ensure that the connections are secure and intact. | Flashlight, Multimeter |
| Reprogram the ECM/PCM | If the injector data is incorrect or corrupted, reprogram the ECM/PCM with the correct calibration data for Cylinder 6. Make sure to use updated software versions from the manufacturer. | ECM/PCM Programming Tool |
| Replace Faulty Components | Replace any faulty components identified during inspection, including the injector, ECM/PCM, or damaged connectors and wiring. Proper replacement and reprogramming will ensure correct functionality. | Replacement Parts |
| Clear the Code and Test System | After performing calibration or replacement, use an OBD-II scanner to clear the code. Conduct a test drive to verify that the new injector data is accepted by the ECM/PCM and that Cylinder 6 is functioning properly. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle to confirm that the P2691 code has not returned and verify that the injector system for Cylinder 6 is functioning efficiently. | OBD-II Scanner |
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