Free Truck Fault Code Lookup

Your truck threw a code.
Find out what it means.

Enter your SPN and FMI below. Get the fault description, symptoms, causes, and repair steps — instantly, no login required.


Type the code exactly as it appears on the dash or scan tool — any format works, we'll figure it out.

Covers Freightliner · Volvo · Kenworth · Peterbilt · International

QuickDTC Community Real answers from truck drivers & mechanics
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How it works

From dashboard warning to fix — in three steps

1
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Read your SPN & FMI

Plug in a scan tool or check your truck’s dash. Note the SPN (Suspect Parameter Number) and FMI (Failure Mode Identifier) from the active fault.

2
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Look it up above

Select your truck brand, enter the SPN and FMI, and hit Lookup. Results appear instantly — no account, no paywall, no waiting.

3
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Fix it with confidence

Get the full picture — severity, symptoms, probable causes, basic checks, and repair steps. Plus a clear “Can You Drive It?” answer so you know if the truck is safe to move.

Coverage

The five biggest fleets in North America

We cover the most common Class 8 trucks on the road. More brands and engines added regularly.

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Freightliner
Detroit DD15

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Volvo
Volvo D13

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Kenworth
PACCAR MX-13

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Peterbilt
PACCAR MX-13

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International
International A26

More truck models and engine variants coming soon.

Why QuickDTC

Built for drivers and owner-operators

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Instant results

No signup, no subscription. Enter SPN + FMI and get your answer in under a second.

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Can You Drive It?

Every code tells you whether it’s safe to keep rolling or time to call a tow — in plain English.

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Real repair steps

Not just a code name. Causes, symptoms, basic checks, and repairs — everything a tech needs on the spot.

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Works on your phone

Fully mobile-friendly. Look up codes from the cab, the shop floor, or the side of the highway.

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Google-indexed pages

Every fault code has its own page. Search “Volvo SPN 780 FMI 2” and find us — no app to download.

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Always free

QuickDTC is and will always be free for drivers. No paywalls, no “premium” lookups.

Got a code on your dash right now?

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