Cylinder 5 Injector Data Incompatible
The P2690 code indicates that the Engine Control Module (ECM) has detected a mismatch or incompatibility in the data received from the fuel injector on cylinder 5. This typically occurs when the injector's electrical characteristics (such as resistance or response time) deviate from expected values, or when there is a communication fault between the injector and the ECM. The ECM uses injector data to precisely control fuel delivery; any incompatibility can lead to improper fueling, causing misfires, rough idle, and reduced performance.
01. Most Common Causes
- Faulty cylinder 5 fuel injector
- Wiring or connector issues at injector 5
- ECM software or hardware malfunction
- Corrosion or damage to injector harness
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire on cylinder 5
- Rough idle or hesitation
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connector at cylinder 5 injector for damage or corrosion.
Step 3: Measure injector resistance and compare to specifications.
Step 4: Swap injector 5 with another cylinder and see if code follows.
Step 5: If code persists, check ECM for software updates or faults.
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 it can cause misfires, catalytic converter damage, and reduced fuel economy. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnostic labor, plus parts if injector replacement is needed (injector cost $100-$300). Total can be $150-$450.