Glow Plug Circuit Low Voltage (Bank 2)
The POWERSTROKE-P1393 (Power Stroke) diesel fault code means: Glow Plug Circuit Low Voltage (Bank 2). This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $100-$500
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Common Symptoms
- Hard cold start
- Rough cold idle
- CEL
Probable Causes (Ranked by Likelihood)
- Failed bank 2 glow plugs Very Likely
- UVCH harness damaged Likely
Frequently Asked Questions
What is P1393 on a 7.3L Power Stroke?
P1393 on a 7.3L Power Stroke (1994-2003) indicates: Glow Plug Circuit Low Voltage (Bank 2). This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P1393 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 P1393?
Repair cost is typically $100-$500 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
Step-by-Step Diagnostic Procedure
Test bank 2 glow plug resistance.
Replace UVCH if harness is compromised.
P1393 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Commonly Affected Vehicles
- 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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