Volvo kept its own fault architecture while the industry moved to SPN/FMI. The result: code lists online that mean nothing until you understand MID/PID. This page teaches the format, then lists the D13's real faults.
How Volvo D13 fault codes work
MID (Message Identification) names the ECU: MID 128 = engine, MID 136 = transmission, MID 144 = vehicle ECU. PID/PPID/SID names the parameter or subsystem. FMI works like J1939. So 'MID 128 PID 102 FMI 4' is engine boost pressure, voltage low — the Volvo way of saying SPN 102 FMI 4.
PTT shows both the native MID/PID and J1939 translation; most generic scanners show only the J1939 side.
Most-searched Volvo D13 codes
These are the codes technicians look up most. Every row links to a full code page with symptoms, ranked causes and step-by-step diagnostics.
| Code | Meaning | Severity | Common fix |
|---|---|---|---|
| MID 128 PID 102 FMI 4 | Boost pressure sensor low | Medium | Sensor/harness |
| MID 128 PPID 270 FMI 4 | EGR valve position fault | High | EGR cleaning/replacement |
| MID 128 SID 146 FMI 4 | EGR cooler efficiency | Medium | Cooler inspection |
| MID 128 PID 404 FMI 0 | Turbo overspeed | High | VGT actuator diag |
| MID 128 PID 164 FMI 0 | Injector cylinder imbalance | Medium | Injector trim/coding check |
| MID 128 PID 407 FMI 4 (EPA13+) | NOx sensor inlet low | High | Sensor/harness |
| MID 128 PID 409 FMI 0 | SCR efficiency below threshold | Critical — derate chain | Guided SCR diag in PTT |
| MID 144 PID 191 FMI 5 | Transmission output speed circuit | High | Wiring/sensor |
Tools that read and clear Volvo D13 codes
Premium Tech Tool is the reference tool — it shows native MID/PID with guided tests. Mack MP engines share this architecture (their codes are on the MP8 page). Multi-brand scanners translate to SPN/FMI adequately for read/clear work.
Frequently Asked Questions
Why doesn't my scanner show MID/PID codes on my Volvo?
Most non-Volvo tools show the J1939 translation only. The native MID/PID appears in PTT and on the truck's own dash display. The conversion logic is on this page — or use PTT for the native view.
Do D11 and D16 share D13 codes?
Yes — same engine family and ECU architecture. Displacement-specific sensors differ slightly, but the code list is effectively shared. D11/D16 owners can use this page directly.
What's the most common D13 aftertreatment fault?
EGR valve and cooler faults on higher-mileage trucks, then NOx sensors. Volvo's EGR system is soot-sensitive; PTT's guided EGR test distinguishes valve from cooler from sensor.