Universal Diesel Fault Codes
23 Universal Diesel diagnostic pages, grouped by the system the code belongs to. Each page covers symptoms, the tests to run in order, tools needed, and realistic parts and labor cost ranges.
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Aftertreatment (2)
Fuel (5)
Air/Turbo (5)
Sensors/Other (11)
- P-code P203F — Reductant Level Low
- P-code P0401 — EGR Insufficient Flow
- P-Code P0402 — EGR Excessive Flow Detected
- P-Code P0404 — EGR Circuit Range/Performance
- P-Code P0473 — Exhaust Pressure Sensor High
- P-Code P0500 — Vehicle Speed Sensor Malfunction
- P-Code P0522 — Engine Oil Pressure Sensor Circuit Low
- P-code P0544 — Exhaust Gas Temperature Sensor Circuit
- P-Code P0638 — Throttle Actuator Control Range/Performance
- P-code P0670 — Glow Plug Control Module
- P-Code P0671 — Glow Plug Circuit Cylinder 1