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SPN 45 — Power Amp (Ford Trucks, Meritor (ex-WABCO) and ZF AS-Tronic)

Do not driveTo the nearest safe stop

SPN 45 is a manufacturer number outside the standard J1939 table: different makes can put different things under it. Below — how it is worded by Ford Trucks, Meritor (ex-WABCO) and ZF AS-Tronic, and what the second half of the code (FMI) means.

Ford TrucksMeritor (ex-WABCO)ZF AS-Tronic

Ford Trucks

Ford Trucks/Ecotorq writes fault numbers in its own format: the code in the table below is a Ford code (hexadecimal, zero-padded), not a J1939 SPN. It matches the standard only where the signal itself is standard, and usually matches the title of this page by digit alone.

FMI 0Throttle Position Valve Electrical – Open Circuit. FODP code (scan tool): P02E0-00.
FMI 1Throttle Position Valve Electrical – Short to Power. FODP code (scan tool): P02E3-24.
FMI 2Throttle Position Valve Electrical – Short to Power. FODP code (scan tool): P02E3-00.
FMI 3Throttle Position Valve Electrical – Chassis Short Circuit. FODP code (scan tool): P02E2-23.
FMI 4Throttle Position Valve Electrical – Chassis Short Circuit. FODP code (scan tool): P02E2-00.
FMI 5Throttle Status – Off. FODP code (scan tool): P02E5-00.
FMI 6Throttle Status – Stay Open. FODP code (scan tool): P02E4-00.

Meritor (ex-WABCO)

FMI 3Power Amp. In Valve Right Rear — Shorted to Battery
FMI 5Power Amp. In Valve Right Rear — Open Circuit
FMI 6Power Amp. In Valve Right Rear — Short to Ground

ZF AS-Tronic

ZF AS-Tronic uses its own fault numbering: the number in the table below is an internal ZF code, not a J1939 SPN. It matches the title of this page by digit only and means something different.

FMI 0Fault on the ZF E-module output to the power take-off 1 (PTO1) valve.

What FMI means in J1939

SPN 45 FMI 045/0 · 45.0data above normal range (most severe level)
SPN 45 FMI 145/1 · 45.1data below normal range (most severe level)
SPN 45 FMI 245/2 · 45.2data erratic or intermittent
SPN 45 FMI 345/3 · 45.3voltage above normal or shorted high
SPN 45 FMI 445/4 · 45.4voltage below normal or shorted to ground
SPN 45 FMI 545/5 · 45.5current below normal or open circuit
SPN 45 FMI 645/6 · 45.6current above normal or grounded circuit

Can I keep driving

Do not drive. Stop as soon as it’s safe to do so — don’t keep going.

What happens if you keep driving

Time you have: To the nearest safe stop

The code is flagged critical: the manufacturer considers it unsafe to keep driving without checking.

This code alone cannot say what will fail next, so stop at the first safe opportunity and look at it on the spot.

That said, the manufacturer flags this code as critical — if in doubt, it is safer to stop and check on the spot.

Nearby: other

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