The Peterbilt 367 is a heavy-duty Class 8 truck known for its rugged reliability and advanced instrumentation. Its gauge cluster provides critical warnings to ensure safe operation and prevent costly breakdowns.
Peterbilt 367 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | Illuminates when a critical fault demands immediate shutdown to prevent engine or drivetrain damage in your Peterbilt 367. | Safely pull over and shut down the engine; check dash display for specific fault. | |
| Master Caution | AMBER | This light in the Peterbilt 367 alerts you to a non-critical issue that needs attention soon, like a DEF level warning. | Refer to the message center for details and schedule service at your earliest opportunity. | |
| Check Engine (MIL) | AMBER | Indicates an engine or emissions system fault detected by the Peterbilt 367's ECM, potentially affecting performance or compliance. | Have the engine scanned by a qualified technician; reduce load and avoid extended idling. | |
| Engine Oil Pressure | RED | Lights when oil pressure drops below safe levels, risking severe engine damage in your Peterbilt 367. | Immediately stop the engine; check oil level and for leaks before restarting. | |
| Battery / Charging | RED | Indicates the charging system is malfunctioning, and the Peterbilt 367 is running on battery power alone. | Check alternator belt tension and battery connections; limit electrical loads until repaired. | |
| Coolant Temperature | RED | Signals the engine coolant in your Peterbilt 367 is overheating, which can lead to head gasket failure. | Reduce engine load immediately; pull over and let the engine idle until temperature drops. | |
| Transmission Temp | AMBER | Warns that transmission fluid temperature is elevated in your Peterbilt 367, often due to heavy load or extended steep grades. | Shift to a lower gear to reduce heat; if light stays on, stop and let the transmission cool. | |
| Brake System | RED | Indicates a fault in the air or hydraulic brake system of your Peterbilt 367, such as low air pressure or brake imbalance. | Do not drive; check air pressure gauges and inspect for leaks before proceeding. | |
| ABS | AMBER | The anti-lock braking system on your Peterbilt 367 has detected a wheel speed sensor or module issue, reducing braking stability. | Service the ABS system soon; standard braking remains active but ABS is inoperative. | |
| Parking Brake | AMBER | Reminds you that the parking brake is engaged in your Peterbilt 367, often illuminated when the brake is set. | Release the parking brake before moving; if light stays off, check brake release valve. | |
| Tire Pressure (TPMS) | AMBER | Alerts you that tire pressure on your Peterbilt 367 is low, which can cause uneven wear and blowouts. | Check and inflate tires to the specified pressure; inspect for punctures. | |
| Seat Belt | RED | Indicates the driver's seat belt in your Peterbilt 367 is not fastened while the ignition is on. | Buckle the seat belt immediately for safety and to silence the warning. | |
| Glow Plug / Preheat | AMBER | Shows the glow plugs are heating in your Peterbilt 367's diesel engine; wait until it turns off before starting in cold weather. | Turn the key to run and wait for the light to go out, then start the engine. | |
| DPF / Regeneration | AMBER | Indicates the diesel particulate filter in your Peterbilt 367 needs active regeneration to clear soot buildup. | Drive at highway speeds to initiate passive regen; if light flashes, initiate parked regen per manual. | |
| DEF / AdBlue | AMBER | Warns that Diesel Exhaust Fluid level is low or quality is poor in your Peterbilt 367, affecting emissions compliance. | Refill with fresh DEF; if light persists, check for crystallization or system faults. | |
| Water in Fuel | AMBER | Alerts that water has accumulated in the fuel/water separator of your Peterbilt 367, which can damage injectors. | Drain the water separator immediately; replace filter if needed. | |
| Low Fuel | AMBER | Indicates the fuel tank in your Peterbilt 367 is running low; you have approximately 10-15% remaining. | Refuel as soon as possible to avoid running out and drawing air into the fuel system. | |
| High Beam | BLUE | Illuminates when the high beam headlights are activated on your Peterbilt 367, indicating enhanced forward lighting. | Dim to low beam when approaching other vehicles to avoid glare. | |
| Air Brake Pressure (Low) | RED | Warns that air brake system pressure in your Peterbilt 367 is below the safe operating threshold. | Stop the truck immediately; do not move until air pressure builds to at least 100 psi. | |
| Engine / Exhaust Brake | AMBER | Indicates the auxiliary braking system (Jacobs or exhaust brake) is engaged on your Peterbilt 367 to assist downhill speed control. | Ensure the brake switch is on; if light blinks, system may be in fault. | |
| Trailer | AMBER | Signals a connection issue with the trailer's lights, brakes, or auxiliary systems on your Peterbilt 367. | Check the trailer electrical harness and air lines; repair any damaged connections. |
21 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
- Radiator blockage or fan failure
- Defective thermostat
What to do
Pull over immediately and let the Peterbilt 367 idle; check coolant level and look for leaks. If overheating persists, do not drive and contact roadside assistance.
Low Oil Pressure
Common causes
- Insufficient engine oil
- Oil pump failure
- Clogged oil filter
What to do
Stop the engine at once. Check oil level with the dipstick; if low, add oil. If pressure remains low after refilling, have the oil system inspected by a Peterbilt dealer.
Air Brake Failure
Common causes
- Air compressor malfunction
- Leak in air lines or tanks
- Faulty governor
What to do
Do not move the Peterbilt 367. Wait for air pressure to build; if it doesn't reach 105 psi, locate and repair any air leaks. Call for service if unable to resolve.
Fuel Filter Water Contamination
Common causes
- Water in diesel fuel
- Clogged fuel/water separator
- Contaminated fuel source
What to do
Drain the water separator (located on the driver side frame rail of your Peterbilt 367) until clear diesel flows. If warning repeats, replace the fuel filter and fuel/water separator.
DPF Regeneration Required
Common causes
- Excessive idling or low-speed operation
- Short trips not allowing passive regen
- Faulty exhaust temperature sensor
What to do
Drive the Peterbilt 367 at highway speeds (55+ mph) for 20-30 minutes to initiate passive regeneration. If the light remains, perform a parked regen using the dash switch. If unsuccessful, see a Peterbilt service center.
Frequently Asked Questions
Why is my Check Engine light on in my Peterbilt 367?
It could be due to a variety of issues, from a loose fuel cap to a faulty oxygen sensor. Have the fault codes read with a diagnostic tool. Many parts stores offer free scanning, but for a Peterbilt 367, a dealer may be best.
What does the amber DPF light mean?
It means the diesel particulate filter needs active regeneration to burn off soot. Drive at highway speed for 20 minutes; if that doesn't clear it, perform a stationary regen using the dash regen button after parking safely.
Can I drive with the DEF light on?
Yes, briefly. But if level is too low, the Peterbilt 367 may derate power and eventually limit speed. Fill with fresh DEF at the next stop. Do not top off overfilled.
How do I reset the oil change reminder on a Peterbilt 367?
Turn the ignition to 'On' without starting the engine. Navigate the dash menu to 'Service' and select 'Reset Oil Life'. Confirm by holding the reset button until the light turns off.
What should I do if the master warning light comes on?
Immediately find a safe place to stop and shut down the engine. The light indicates a serious fault that could damage the engine or drivetrain. Check the message center for details and call for assistance.
Why is my ABS light staying on?
Usually due to a wheel speed sensor malfunction or damaged ABS module wiring. Standard brakes still work, but ABS is disabled. Have the system diagnosed by a technician to restore full safety features.