The Ford Transit 350 diesel instrument cluster monitors key systems for safety and emissions compliance. This guide explains common dashboard lights to help you interpret warnings specific to your Transit 350.
Ford Transit 350 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Check Engine (MIL) | AMBER | Indicates an engine or emissions fault that may affect performance or require diagnostic scan. | Have the engine code read by a Ford dealer or mechanic; reduce speed and avoid heavy loads. | |
| Glow Plug / Preheat | AMBER | Illuminates when the glow plugs are heating to aid cold starts; wait for it to turn off before cranking. | Wait for the light to go out, then start the engine. If it flashes, have the glow plug system checked. | |
| DPF / Regeneration | AMBER | Indicates the diesel particulate filter is actively regenerating to burn off soot. | Continue driving at highway speed if safe to complete regeneration; if light stays on, service needed. | |
| DEF / AdBlue | AMBER | Low DEF fluid level or system fault; reduces engine power if ignored to prevent emissions violations. | Top up DEF fluid immediately; if light persists, have the DEF system inspected. | |
| Water in Fuel | AMBER | Water detected in the fuel/water separator; can damage injectors if not drained. | Drain water from the fuel filter housing per owner's manual; if light stays, replace fuel filter. | |
| Engine Oil Pressure | RED | Low engine oil pressure, which can cause severe engine damage within seconds. | Stop the engine immediately and check oil level; if OK, do not restart and call for service. | |
| Battery / Charging | RED | Charging system fault; battery may not be charging properly, risking stalling. | Check alternator belt and battery connections; drive to a service center if safe, but expect limited range. | |
| Coolant Temperature | RED | Engine coolant temperature is too high, risking overheating and engine damage. | Stop engine and let cool; check coolant level and fan operation, then see dealer. | |
| Transmission Temp | AMBER | Transmission fluid temperature is high; heavy towing or stop-and-go can cause this. | Pull over and idle in neutral to cool transmission; avoid towing until fluid level checked. | |
| Brake System | RED | Brake system malfunction, low fluid, or brake wear; braking performance may be compromised. | Check brake fluid level; if low, top up and inspect for leaks. Do not drive until safe. | |
| ABS | AMBER | Anti-lock brake system fault; normal braking still works but ABS may not engage in slippery conditions. | Drive cautiously; have ABS system diagnosed by a Ford technician soon. | |
| Parking Brake | RED | Parking brake is engaged or there is a fault in the brake system. | Release parking brake; if light stays, check brake fluid or have system inspected. | |
| Tire Pressure (TPMS) | AMBER | One or more tires are significantly under-inflated; affects handling and fuel economy. | Check and inflate tires to recommended pressure; reset TPMS if needed. | |
| Airbag (SRS) | AMBER | Supplementary Restraint System fault; airbags may not deploy in a crash. | Have the SRS system inspected by a Ford dealer immediately. | |
| Seat Belt | RED | Driver seat belt not fastened; chime accompanies this light. | Fasten your seat belt immediately. | |
| Low Fuel | AMBER | Fuel level is critically low; you have limited range remaining. | Refuel as soon as possible to avoid running out and risk of fuel system damage. | |
| High Beam | BLUE | High beams are on; indicates forward lighting is in high beam mode. | Dim high beams when approaching other vehicles to avoid glare. | |
| Power Steering (EPS) | RED | Electric power steering fault; steering effort may increase significantly. | Steer carefully and have EPS system checked at a Ford service center. | |
| Reduced Power (Limp Mode) | AMBER | Engine management has limited power to protect the drivetrain from damage. | Reduce speed and avoid heavy acceleration; seek repair to restore full power. | |
| Door Open | RED | A door or the hood is not fully closed, often accompanied by a chime. | Check all doors and the hood; close securely before driving. | |
| High Exhaust Temp (HEST) | AMBER | Exhaust system temperature is elevated, typically during DPF regeneration. | Continue driving; avoid parking over dry grass. If light stays on, service may be needed. | |
| Washer Fluid Low | AMBER | Windshield washer fluid level is low. | Top up washer fluid reservoir with appropriate fluid. |
22 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Low Engine Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
For your Transit 350, stop immediately and check oil level with the dipstick. If low, add 5W-30 diesel oil to the correct level; if not low, do not restart—call roadside assistance.
Engine Overheating
Common causes
- Low coolant level
- Coolant leak
- Thermostat stuck closed
What to do
Turn off the engine and let it cool. Check coolant reservoir level; if low, top off with 50/50 Ford-spec coolant. If light persists, have the cooling system inspected for leaks or a faulty fan clutch.
DEF System Failure
Common causes
- DEF fluid empty
- DEF pump fault
- NOx sensor failure
What to do
Refill DEF tank with Ford-approved fluid. If light stays on, the DEF system may need a dealer reset or component replacement to restore full power and avoid emissions violations.
DPF Regeneration Stuck
Common causes
- Frequent short trips
- Excessive idling
- DPF sensor issue
What to do
Drive the Transit 350 at highway speeds (above 30 mph) for 20-30 minutes to complete regeneration. If light remains, a forced regen or DPF cleaning at a shop may be needed.
Brake System Failure
Common causes
- Low brake fluid
- Brake pad worn out
- ABS module fault
What to do
Check brake fluid level in reservoir; if low, inspect for leaks and top up. If brake pedal feels soft or spongy, do not drive; have brakes serviced immediately.
Frequently Asked Questions
Why is my Check Engine light on but the van runs fine?
On the Ford Transit 350, the check engine light can illuminate for minor issues like a loose gas cap or a failing oxygen sensor. However, it may also indicate underlying problems that could worsen. Have the codes read to be safe.
Can I drive with the DPF regeneration light on?
Yes, the DPF regen light means the filter is cleaning itself. Continue driving at highway speeds if possible. Avoid short trips and excessive idling to allow regeneration to complete. If it flashes or stays on, service is needed.
How often do I need to add DEF to my Transit 350 diesel?
DEF consumption varies, but typically every 3,000 to 5,000 miles depending on usage. The low DEF warning comes on well before the tank runs dry. Refill with quality DEF fluid to avoid power reduction.
What does the glow plug light mean in warm weather?
Even in warm weather, the glow plug light may flash briefly for a system check. If it stays on or flashes rapidly, it indicates a glow plug failure. Have the system tested, as it's crucial for cold starts.
Why is the brake light on even with the parking brake off?
This can indicate low brake fluid due to worn pads or a leak. Check the brake fluid level under the hood. If it's low, top up and look for leaks. If the light persists, have the brake system inspected by a Ford specialist.
What should I do if the water in fuel light comes on?
The water in fuel light indicates moisture in the fuel/water separator. Drain the water using the valve on the filter housing (located on the driver side frame rail). If the light stays, replace the fuel filter.