System Voltage High
The MAXXFORCE-P0563 (MaxxForce) diesel fault code means: System Voltage High. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $300-$900
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Common Symptoms
- CEL
- Battery warning
Probable Causes (Ranked by Likelihood)
- Overcharging alternator Likely
- Bad voltage regulator Possible
Step-by-Step Diagnostic Procedure
Test alternator output -- should be 13.5-14.8V.
Replace alternator.
Frequently Asked Questions
What is P0563 on a MaxxForce DT (7.6L)?
P0563 on a MaxxForce DT (7.6L) (2007-2015) indicates: System Voltage High. This is a known fault code on the MaxxForce engine family and typically points to the causes listed above.
Can I drive with P0563 on my MaxxForce?
Yes, you can generally drive with this code, but diagnose soon to prevent secondary damage.
How much does it cost to fix MaxxForce P0563?
Repair cost is typically $300-$900 depending on the underlying cause and shop rate. Many MaxxForce faults (especially EGR cooler, head bolt, and VGT repairs) are major expenses that drove fleet owners to repower with Cummins or retire these trucks early.
P0563 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: