Invalid Engine Position Sensor Signal
The engine control unit is receiving an invalid signal from the engine position sensor.
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What it means (plain English)
The engine position sensor tracks where the engine is in its cycle. If the sensor sends bad data, the computer can't control the engine properly, which can lead to poor performance or a no-start situation.
What the computer is actually seeing
The ECM expects a steady average voltage of about 0.5 to 4.5 volts from the engine position sensor at various engine speeds. If it sees high frequency spikes or voltages outside this range, it triggers this fault.
What a healthy reading looks like
Engine position sensor voltages should range from 0.5V (engine at TDC) to 4.5V (at max RPM).
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 the wiring and connectors to the engine position sensor for damage or corrosion. If found, repair or replace.
- 22. Use a multimeter to check the voltage output of the engine position sensor while the engine is running. It should show between 0.5V and 4.5V.
- 3 - If voltage is outside this range, replace the sensor.
- 4 - If voltage is within range, proceed to inspection of the ECM.
- 53. Inspect the ECM and its software updates. If no fault is found with wiring or sensor, consider reprogramming or replacing the ECM.
Common causes
- Faulty engine position sensor
- Wiring issues (open circuit, short to ground/voltage)
- Poor connections or corrosion at the sensor or ECM connector
- ECM malfunction or software issue
Typical repair cost
$$$ (typically $300 - $700, depending on parts and labor)
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive, as engine performance can be severely affected, leading to stalling or no-start.
Will this fault code come back after repairs?
If the root cause is fixed and no new issues arise, the code should not return.
Why does this issue sometimes appear with SPN 1363?
SPN 1363 usually indicates a related issue with the crankshaft position sensor; both sensors work together to determine engine timing.
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