The Ford Super Duty F-350 Super Duty features a comprehensive instrument cluster with distinct warning lights for its heavy-duty diesel powertrain, towing systems, and vehicle diagnostics. These indicators are crucial for maintaining performance and safety under extreme workloads.
Ford Super Duty F-350 Super Duty Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | This red stop light illuminates when the system detects a severe powertrain or safety fault requiring immediate attention. | Safely pull over and shut off the engine. Consult the message center for specific fault codes. | |
| Check Engine (MIL) | AMBER | Indicates an engine or emission control system irregularity that may affect the 6.7L Power Stroke diesel's performance and emissions compliance. | Schedule a diagnostic scan soon; if flashing, reduce load and seek service immediately. | |
| Glow Plug / Preheat | AMBER | Illuminates when the glow plugs are preheating the 6.7L Power Stroke's combustion chambers for cold starting; may flash to indicate a fault. | Wait for the light to turn off before cranking. If flashing, have glow plug circuit inspected. | |
| Water in Fuel | AMBER | Warns that water has accumulated in the fuel/water separator, which can damage the high-pressure fuel system of your F-350's diesel engine. | Drain the water from the filter assembly immediately following the owner's manual procedure. | |
| DPF / Regeneration | GREEN | Illuminates when the diesel particulate filter is actively regenerating to burn off soot; may flash if regeneration is disabled or incomplete. | Continue driving to complete the cycle; if flashing, ensure exhaust temperatures are high enough or contact dealer. | |
| DEF / AdBlue | AMBER | Indicates low Diesel Exhaust Fluid level or a system fault that could eventually limit vehicle speed to 5 mph on your F-350. | Top off with DEF immediately. If persistent, have the SCR system serviced. | |
| Engine Oil Pressure | RED | Lights when oil pressure is critically low, risking severe engine damage to the 6.7L Power Stroke. | Stop the engine immediately and check oil level/leaks; do not restart. | |
| Battery / Charging | RED | Warns of a charging system malfunction that may drain the dual batteries of your F-350 and cause a stall. | Check alternator belt and connections; have charging system tested as soon as possible. | |
| Brake System | RED | Indicates a hydraulic brake system failure, low brake fluid, or a fault in the antilock braking system on your Super Duty. | Stop safely and do not drive. Check brake fluid level and have the system inspected. | |
| ABS | AMBER | Lights when the anti-lock brake system detects a fault; normal braking is retained but ABS may not engage on slippery roads. | Drive cautiously and have the ABS module diagnosed by a Ford dealer. | |
| Tire Pressure (TPMS) | AMBER | Warns of one or more tires significantly underinflated, which can affect stability and fuel economy on your heavy-duty F-350. | Check and inflate tires to the recommended pressure; reset system if needed. | |
| Airbag (SRS) | RED | Indicates a fault in the supplemental restraint system that may prevent airbags from deploying in a collision. | Have the SRS system diagnosed immediately by a certified technician. | |
| Seat Belt | RED | Reminds the driver or front passenger to fasten their seat belt while the vehicle is moving. | Fasten your seat belt to silence the chime and turn off the light. | |
| High Beam | BLUE | Confirms the high-beam headlamps are activated for improved visibility on dark roads. | Use only when appropriate; dim when approaching other vehicles. | |
| Parking Brake | RED | Illuminates when the parking brake is engaged; if it stays on while driving, it may indicate a brake system issue. | Release the parking brake fully. If light stays on, check brake fluid and system. | |
| Coolant Temperature | RED | Alerts that engine coolant temperature is dangerously high, risking overheating of the 6.7L Power Stroke. | Stop engine immediately, allow to cool, and check coolant level and leaks. | |
| Transmission Temp | AMBER | Warns that the TorqShift automatic transmission fluid temperature is elevated, potentially due to heavy towing or a fault. | Reduce load or stop to allow transmission to cool; if persistent, service transmission. | |
| Low Fuel | AMBER | Reminds you that the fuel level is low; runs on the 6.7L diesel may be limited soon. | Refuel with diesel as soon as possible to avoid running out. | |
| Power Steering (EPS) | RED | Indicates a fault in the electric power steering system, making steering heavy on your F-350. | Reduce speed and have the EPS system serviced; drive only if necessary. | |
| Reduced Power (Limp Mode) | AMBER | Lights when the powertrain control module limits engine power to protect the drivetrain from damage. | Reduce speed and have the vehicle diagnosed; check for related warning messages. |
20 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Low coolant level
- Flooded DPF causing excessive exhaust back pressure
- Failed water pump or thermostat
What to do
Immediately stop the engine and allow it to cool. Check coolant reservoir and radiator for leaks. If level is low, top off with Ford-approved coolant and have the cooling system inspected by a dealer.
Brake Failure
Common causes
- Severe brake fluid leak
- Worn brake pads beyond limits
- Faulty master cylinder or ABS module
What to do
Do not drive. Have the vehicle towed to a Ford service center. Check brake fluid level; if low, add DOT 3 fluid and inspect for leaks. Brake pedal feel may indicate master cylinder failure.
Diesel Particulate Filter Clogged
Common causes
- Frequent short trips preventing passive regeneration
- High soot load due to malfunctioning injectors
- Failed DPF regeneration system
What to do
Drive at highway speeds for 20 minutes to initiate active regeneration. If light persists, have the DPF cleaned or replaced by a dealer; extended idling may worsen the issue.
Transmission Overheating
Common causes
- Prolonged heavy towing in hot weather
- Low transmission fluid level
- Clogged transmission cooler
What to do
Reduce engine load and let transmission cool. Check fluid level with engine running and park on level ground. If low, add Motorcraft MERCON LV. For persistent overheating, have cooling system inspected.
Low Engine Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter or pickup screen
What to do
Shut off engine immediately. Check oil level using dipstick; add 5W-30 or 5W-40 diesel oil if low. If pressure warning persists, do not restart and have the oil system inspected.
Frequently Asked Questions
What does the glow plug light mean on my F-350 in cold weather?
The amber coil symbol indicates the glow plugs are heating the 6.7L Power Stroke's combustion chambers for easier cold starts. Wait until it turns off before cranking. If it flashes, a glow plug or controller may need service.
How do I manually start a DPF regeneration on my Super Duty?
The system automatically triggers regeneration when exhaust temperatures are high enough—typically during highway driving. You cannot manually start it; if stopped active regen is needed, a dealer can force it via scan tool.
Is it safe to drive with the check engine light on steady?
A steady amber check engine light means a non-emergency fault, but it may affect emissions and fuel economy. You can drive to a service center, but avoid heavy loads. If flashing, reduce power immediately and seek repair.
Why does my DEF light come on even after refilling?
The DEF gauge may not immediately reset. Drive a few miles after refilling. If the light stays on, there could be a faulty DEF quality sensor or heated line; have the SCR system diagnosed.
What should I do if the water in fuel light comes on?
Drain the water separator located on the fuel filter housing. On the 6.7L, it's usually a valve on the driver-side frame rail. Turn to open and collect water in a container, then close. If light remains, the sensor may be faulty.
How long can I drive with the TPMS light on?
The light warns of low tire pressure, which can cause tire damage and poor handling. Check pressure soon—do not exceed 50 miles before inflating to the recommended cold pressure (usually 65 psi front, 80 psi rear for your F-350).