Volvo EC Series Excavator — Diagnostic Health Report
- Manuel Acosta
- Sep 19
- 3 min read
Updated: Sep 25
Here's the exact diagnostic summary I'll send to a client after working on their Volvo excavator on-site. No changes, no tweaks—just the actual email as it is. I share these reports to demonstrate how OnSite Diesel Solutions communicates clearly, diagnoses accurately, and earns trust by being transparent.
Volvo EC Series Excavator — Diagnostic Health Report
OnSite Diesel Solutions, LLC
11631 Oak Ridge Tr.
Loma Rica, CA 95901
Phone: (916) 224-2880
Tax ID: 33-4021979
Technician: Manuel
Summary for Client
Hi [client name],
I performed a full diagnostic scan on your Volvo excavator. The check engine light is caused by a failure in the fuel pressure relief valve, which allowed the injector rail to reach dangerous pressure levels (~40,000 psi)—well above factory spec. This fault must be corrected immediately to avoid system damage. Regarding the fuel system fault that reappeared—this is the same high-pressure fuel code (P000F) we encountered previously. While the fault was temporarily cleared during the last session, the underlying issue was not fully resolved. In these cases, the ECM will suppress the warning until the fault condition returns, which it now has. This particular code indicates that the fuel pressure relief valve isn’t regulating properly, causing pressure to spike beyond safe limits. Resetting the code won’t prevent recurrence—it’s a mechanical fault, not just a sensor glitch. To protect the fuel injectors and ensure long-term reliability, I strongly recommend replacing the valve. Once corrected, the code should stay cleared and the warning light should remain off.
Other issues include communication faults with the GPS/GSM module and a control signal mismatch—these aren't impacting performance but should be addressed.
I also attempted a DPF regeneration but couldn’t complete it due to the existing pressure fault. Once the key repairs are completed, we can clear codes and perform a complete emissions reset.
The following is the summary of the report. I have also attached the PDF full report with email.
Client: [name]
VIN: VCEC250EC00310332, 250E Volvo Excavator
Date: May 18, 2025
Active Fault Codes
Fault Code | Description | Module | Status | MIL On |
P000F FMI:00 | Fuel Pressure Relief Valve Fault | Engine (EMS V3) | Active | Yes |
B1009 FMI:62 | Incorrect Control Pattern (Signal Mismatch) | Vehicle ECU (HMICU) | Active | No |
B1007 FMI:1D | GSM Antenna Circuit Current Out of Range | Telematics (WECU) | Active | No |
B150D FMI:68 | Config Data/Event Record Fault | Telematics (WECU) | Active | No |
B150F FMI:1D | GPS Antenna Circuit Current Out of Range (x2) | Telematics (WECU) | Active | No |
Critical Notice: Fault code P000F is triggering the engine light and represents a serious overpressure condition. Rail pressure peaked at 40,000 psi, well above the expected maximum of ~23,000–26,000 psi under full load. This can damage injectors or seals and requires immediate correction.
System Health Summary
Fuel System: High-pressure spike recorded (40,000 psi). Pressure far exceeds spec, confirming failure in the pressure regulation system.
Engine & Injectors: Injectors are functioning but exposed to dangerous pressure levels due to PRV fault.
Coolant System: Stable operation between 78–86°C—no signs of overheating.
Oil System: Pressure normal (~37.7 psi); level exceeded max—recommend checking for fuel dilution.
EGR/Emission Systems: Diagnostic incomplete due to unmet conditions—potential sensor or idle state issue.
DPF/SCR Systems: Regeneration conditions mostly met, but SCR in reduced metering mode; full regen did not complete.
Telematics: GPS/GSM antenna errors and data config fault logged—no impact to engine but could affect diagnostics.
DPF Regeneration Attempt
Status: Incomplete
Coolant Temp: 170.6°F
Exhaust Temps: 235–252°F
SCR Status: Reduced Metering
Outcome: Initial conditions met, but active fault(s) prevented successful regeneration
Next Step: Clear PRV fault and retest
Recommended Actions & Repair Estimates
Task | Labor (hrs) | Estimated Cost | Notes |
Replace Fuel Pressure Relief Valve | 1.0 | $380 – $520 | Prevent injector damage; resolves MIL |
Investigate Oil Overfill | 0.5 | $100 – $160 | Check for injector leak/fuel dilution |
ECU Signal Inspection | 1.0 | $200 – $300 | Resolve signal mismatch |
Telematics Fault Diagnosis | 0.5 | $120 – $180 | GPS/GSM circuit inspection |
Re-run EGR Test After Repairs | 0.5–1.0 | $150 – $220 | Check valve response and sensor input |
Estimated Total: $950 – $1,380
Priority: Address fuel pressure issue immediately due to risk of injector and system damage.
Let us know how you'd like to proceed. We’re here to support the next steps.
Best regards,
Manuel Acosta/owner
OnSite Diesel Solutions, LLC
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