Camshaft Position Sensor Circuit Malfunction
The POWERSTROKE-P0340-73 (Power Stroke) diesel fault code means: Camshaft Position Sensor Circuit Malfunction. This is a moderate severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $80-$200
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View pilot availability →What Are the Symptoms of POWERSTROKE-P0340-73?
- Extended crank or no start
- Intermittent stalling
- Check Engine Light
- Rough running when hot (thermal failure)
What Causes POWERSTROKE-P0340-73? (Most Likely First)
- Failed CMP (cam position sensor) -- common on 7.3L when hot Very Likely
- Damaged sensor wiring or connector Likely
- Cracked sensor housing allowing oil intrusion Possible
- PCM fault (rare) Less Likely
Can I Still Drive with POWERSTROKE-P0340-73?
Yes, but fix soon. POWERSTROKE-P0340-73 is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring it.
Frequently Asked Questions
What is P0340 on a 7.3L Power Stroke?
P0340 on a 7.3L Power Stroke (1994-2003) indicates: Camshaft Position Sensor Circuit Malfunction. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P0340 on my Power Stroke?
Yes, you can generally drive with this code, but diagnose it soon to prevent further damage.
How much does it cost to fix P0340?
Repair cost is typically $80-$200 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose POWERSTROKE-P0340-73?
Connect scan tool (AutoEnginuity, ForScan, or IDS) and verify P0340 is active vs history.
Measure CMP signal on the yellow wire with a DVOM set to AC volts -- should pulse 0.1-1.2V AC at cranking. If it stays at 0V, sensor is dead.
Hot-soak test: let truck reach operating temp, then try a restart. Failed 7.3L CMPs often die hot and recover cold.
Inspect wiring for oil saturation near the sensor (mounted at front of engine behind harmonic balancer).
Replace with OEM Motorcraft CMP -- cheap aftermarket CMPs have a high early-failure rate on 7.3L.
Which Vehicles Commonly Get POWERSTROKE-P0340-73?
- 1994.5-1997 Ford F-250/F-350 7.3L Power Stroke
- 1999-2003 Ford F-250/F-350 Super Duty 7.3L Power Stroke
- 1999-2003 Ford F-450/F-550 Super Duty 7.3L Power Stroke
- 1994.5-2003 Ford E-350/E-450 7.3L Power Stroke
- 2000-2003 Ford Excursion 7.3L Power Stroke
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