Injection Pump Timing Calibration Not Learned
The P2673 code indicates that the engine control module (ECM) has not successfully learned or stored the injection pump timing calibration. This calibration is critical for proper fuel injection timing, which affects engine performance, emissions, and fuel economy. The ECM uses sensor inputs (e.g., crankshaft position, camshaft position, and fuel pressure) to adjust timing; if the learning process fails, the ECM defaults to a base timing map, often causing drivability issues.
01. Most Common Causes
- Battery or ECM power loss during calibration procedure
- Faulty crankshaft or camshaft position sensor
- Incorrect injection pump installation or replacement
- ECM software or hardware malfunction
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine hard starting or no start
- Rough idle or misfire
- Reduced power and poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and verify P2673 is present.
Step 2: Check battery voltage and connections; ensure no recent power loss.
Step 3: Inspect crankshaft and camshaft position sensors for damage or misalignment.
Step 4: Perform injection pump timing calibration procedure using a scan tool (follow manufacturer's instructions).
Step 5: If calibration fails, test sensors and wiring; consider ECM reprogramming or replacement.
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 engine may run poorly, stall, or fail to start. Seek repair promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. If sensors need replacement, add $100-$300. ECM reprogramming or replacement can be $200-$1000+.