Volvo D13 Fault Codes Reference (Top 18) | HDT
Volvo D13 powers most Volvo VNL, VNR, and VHD trucks built since 2007. The D11 (smaller regional) and D16 (heavy vocational / long-haul) share much of the architecture. Volvo and Mack are both Volvo Group brands — most fault codes are identical between Volvo D13 and Mack MP8. The 18 codes below are the ones we see most often. Premium Tech Tool (PTT) is the OEM platform; aftermarket (JPRO, Jaltest, TEXA IDC6) handles diagnostics and forced regens but cannot reflash.
For diagnostic platform comparison, see scan tool comparison. For related Volvo Group engines, see Mack MP8 fault code reference.
Fuel system codes
| SPN/FMI | Description | Common cause | Next step |
|---|---|---|---|
| 164/0 | Fuel rail pressure too high | Stuck pressure regulator, failed rail pressure sensor | Live data — commanded vs actual rail pressure under load. If actual exceeds commanded persistently, replace pressure regulator. Sensor failure usually shows wildly disconnected reading. |
| 164/1 | Fuel rail pressure too low | Plugged fuel filter, weak feed pump, dropping injector, air in fuel system | Check primary and secondary fuel filter restriction. Verify feed pump pressure (Volvo target: 30+ PSI). Run cylinder cutout to isolate dropping injector if both OK. |
| 651-656/5 | Cylinder N injector circuit / response fault | Failed unit injector, harness chafe, ECM driver fault | Run injector solenoid test in PTT. Volvo D13 unit injectors share the harness — chafe at the harness pass-through is a common Volvo issue. |
| 97/3 or 4 | Water in fuel sensor circuit fault | Failed WIF sensor, contaminated fuel, harness fault | Drain fuel water separator; inspect WIF sensor. Replace if test shows resistance out of spec. |
Air handling and EGR codes
| SPN/FMI | Description | Common cause | Next step |
|---|---|---|---|
| 411/4 or 5 | EGR valve position circuit fault | Carbon-coked EGR valve, failed position sensor | EGR valve sweep test in PTT. Replace if mechanical bind. Volvo D13 EGR is sensitive to local-haul duty cycles; highway fleets see fewer EGR codes. |
| 2789/14 | VGT actuator commanded position not reached | Carbon on VGT vanes, failed actuator | VGT sweep test. Decarbon or replace turbo for stuck vanes; replace actuator only for electrical failure. |
| 27/4 | Boost pressure sensor circuit fault | Failed boost sensor, oil contamination from worn turbo seals | Replace sensor; check intake manifold for oil indicating turbo seal wear. |
| 2630/15 | Charge air cooler outlet temperature high | Plugged CAC, failed CAC temp sensor | Compare CAC inlet/outlet temp under load. Excessive temp rise = airflow restriction in the cooler. |
Aftertreatment codes
| SPN/FMI | Description | Common cause | Next step |
|---|---|---|---|
| 3251/0 | DPF differential pressure too high | DPF heavily soot-loaded | Force a stationary regen. If dP doesn’t drop after a complete regen, DPF needs cleaning or replacement. |
| 3361/5 or 7 | DEF dosing valve / injector fault | Crystallized DEF in line, failed dosing valve | DEF dosing test. Inspect for white DEF crystal buildup. Clean or replace dosing valve. |
| 3936/0 | SCR conversion efficiency low | Failed NOx sensor (250-400K mi wear item), expired DEF, mechanical (EGR over-flow, intake leak) | Compare upstream/downstream NOx sensor data. DEF concentration check with refractometer. Replace NOx sensor if data isn’t logical under load. |
| 4334/0 or 1 | DEF pump pressure abnormal | Frozen DEF lines (winter), failed DEF supply pump, low DEF | Check DEF heater operation in winter. Cycle ignition while monitoring pump pressure during priming. |
| 5246/0 or 16 | Aftertreatment derate / inducement | Persistent SCR or DEF fault triggering Volvo inducement ladder | Find root SCR/DEF cause first; this is downstream. Volvo inducement reset may require under-load drive cycle. |
| 5298/15 or 16 | SCR efficiency monitor fault | Marginal SCR performance — usually precursor to 3936 hard fault | NOx sensor data, DEF concentration, DEF dosing line restriction check. |
Sensors and electrical codes
| SPN/FMI | Description | Common cause | Next step |
|---|---|---|---|
| 110/3 or 4 | Coolant temperature sensor circuit fault | Failed ECT sensor, harness chafe | Backprobe sensor; replace if out-of-spec, repair harness if voltage doesn’t match. |
| 100/1 or 4 | Engine oil pressure low / sensor fault | Genuinely low oil pressure or failed sensor | Confirm with mechanical gauge before assuming sensor failure. |
| 168/0 or 1 | Battery voltage out of range | Failing batteries, alternator over/under-charging, ground corrosion | Volvo VNL is sensitive to weak ground straps — common cause of erratic sensor codes. |
Volvo-specific notes
- D13 / D11 / D16 share architecture: Most fault codes are identical across the three. D11 is the smaller regional engine, D16 is the heavy vocational and long-haul variant. Same diagnostic logic applies.
- Premium Tech Tool (PTT): OEM platform shared with Mack — reflash, parameter programming, full chassis access for both Volvo and Mack.
- I-Shift transmission: Volvo I-Shift AMT diagnoses through PTT. JPRO and Jaltest CV cover I-Shift at diagnostic depth.
- Volvo OEM connector: Older Volvo trucks may use a Volvo-specific 8-pin diagnostic connector. The Jaltest JDC528A (Volvo Penta diesel 8-pin) handles this; for newer Volvo VNL/VNR, the standard 9-pin Deutsch works.
Tools we recommend
- Volvo PTT (Premium Tech Tool) — OEM platform for reflash, parameter programming, full chassis access
- TEXA IDC6 Truck — strongest European HD coverage; excellent Volvo D13 / D11 / D16 support. TEXA packages
- JPRO Professional — solid Volvo coverage at aftermarket depth. JPRO packages
- Jaltest CV — multi-brand including Volvo. European HD heritage. Jaltest packages
- NEXIQ USB-Link 3 — RP1210 adapter that pairs with the above
Frequently asked questions
Stuck on a Volvo D13 code? Free help.
Tell us the SPN/FMI, what’s been replaced, and what live data you’re seeing. Free phone diagnostic guidance — call (800) 399-9495. Browse multi-brand platforms: JPRO, Jaltest, TEXA.
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