Do not driveMinutes
J1939 code SPN 70. Below — how the fault is worded at the factory by Ford Trucks, International, Mercedes-Benz, Renault Trucks and ZF AS-Tronic, and what the second half of the code (FMI) means in the standard.
Ford TrucksInternationalMercedes-BenzRenault TrucksZF AS-Tronic
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 16 | External temperature HW signal voltage at ADC below normal. FODP code (scan tool): P0070. |
| FMI 17 | External temperature HW signal voltage at ADC above normal. FODP code (scan tool): P0070. |
| FMI 2 | Air Powered Park Brake — The Auto apply portion with the Air Powered Park Brake is not Operating |
| FMI 7 | Air Powered Park Brake — Air Powered Park Brake is stuck |
| FMI 14 | Air Powered Park Brake — Air Powered Park Brake is stuck; Air Powered Park Brake — The Auto Apply portion with the Air Powered Park Brake is not operating |
| FMI 2 | Park Brake Status Not Plausible (Vehicle Moving) |
| FMI 13 | J1939 Park Brake Switch Signal from Source CCVS1, CCVS2 or CCVS3 is missing or not available = SNA (signal not available) |
| FMI 19 | J1939 Park Brake Switch Signal from Source CCVS1, CCVS2 or CCVS3 is erractic = undefined value but not SNA |
| FMI 7 | Parking brake circuit fault. Repair: Check the parking brake. Clear the fault codes. If the fault persists, replace the trailer control module. |
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 6 | Short circuit to positive supply on valve Y6 output (engagement valve). |
Do not drive. Stop as soon as it’s safe to do so — don’t keep going.
Part of the brake circuit or ABS/EBS is out of service. The pedal may still feel normal — until the first emergency stop or descent.
Next comes longer stopping distance, a skid on a slick surface, failure on a long downgrade. This is the case where "I will take it slow" does not work.
Let the air system build to working pressure and listen for leaks. Don’t drive with faulty brakes.
Scanner threw several codes at once? Paste the whole list — we will show which one is the root cause and which ones simply followed.