FUEL INJECTION TIMING ERROR
Fuel injection timing is incorrect for engine operation.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine's computer is not firing the fuel injectors at the right time, which can cause poor performance and emissions issues.
What the computer is actually seeing
The engine control module (ECM) expects the fuel to inject at a certain angle and duration based on engine RPM and load.
What a healthy reading looks like
Injection timing should usually be within ±2 degrees of target timing depending on the engine specs.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check for additional fault codes; clear them and see if SPN 5276 returns. If yes, proceed to the next step.
- 22. Inspect the wiring and connectors related to the fuel injection system for any signs of wear or damage. Repair any issues found.
- 33. Check fuel levels and ensure there are no fuel system leaks leading to air entering the system.
- 44. Test the fuel injection pump for proper operation; expected pressure is typically between 250-300 PSI.
- 55. Verify that the crankshaft and camshaft position sensors are functioning properly; check for expected voltage outputs around 5V.
- 66. If all sensors and wiring are good, inspect the timing chain/belt for wear and proper alignment.
Common causes
- Faulty fuel injection pump
- Worn timing components
- Faulty crankshaft or camshaft position sensors
- ECM programming error
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, this code indicates a serious timing issue that can cause engine failure or damage.
Will this fault code come back?
If the underlying issue isn't fixed, the code is likely to return after clearing.
Why does this code sometimes pair with SPN 5246?
SPN 5246 indicates a fuel delivery problem; when injection timing is off, it can affect fuel delivery performance.
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