P0712 — Trans fluid temp — voltage low
What it means: Trans fluid temp — voltage low.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Unplug — invert
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Billings, MT
Closest first. Tell them P0712 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Billings, MT · (406) 245-8985
- 0.0 mi away — based in Billings, MT · (406) 252-8413
- 0.0 mi away — based in Billings, MT · (406) 780-3711
What P0712 means
Trans fluid temp — voltage low. Common causes: Signal to ground|Failed sensor.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Signal to ground
- Failed sensor
First moves (roadside)
- Unplug — invert
FAQ
Trans fluid temp — voltage low. Common causes: Signal to ground|Failed sensor.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Signal to ground. Other possibilities include Failed sensor.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P0712, or share the same subsystem.
- Main shaft speed erratic (SPN 160 FMI 2)
- Input shaft speed erratic (SPN 161 FMI 2)
- Transmission output retarder speed erratic (SPN 162 FMI 2)
- Trans oil temperature very high (SPN 177 FMI 0)
- Trans oil temperature voltage high (SPN 177 FMI 3)
- Trans oil temperature voltage low (SPN 177 FMI 4)
- Engine speed signal abnormal update rate (SPN 190 FMI 9)
- Transmission output shaft speed erratic (SPN 191 FMI 2)
Same symptom: Charging and voltage
Other codes that trace back to voltage — one bad ground can set half a dozen of them at once.
- Trans oil pressure voltage high (SPN 1762 FMI 3) · Drivetrain & Transmission
- Trans oil pressure voltage low (SPN 1762 FMI 4) · Drivetrain & Transmission
- Trans fluid temp — voltage high (P0713) · Drivetrain & Transmission
- Trans pressure sensor B — voltage low (P0847) · Drivetrain & Transmission
- Trans pressure sensor B — voltage high (P0848) · Drivetrain & Transmission
- Pressure control solenoid A — voltage low (P0962) · Drivetrain & Transmission
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.