Indicator/Warning Message Description and Operation. Chevrolet C-Series Medium Duty Truck C6/7/8

For 1990-2009 cars

Makes 🢒 Chevrolet 🢒 2004 🢒 C-Series Medium Duty Truck C6/7/8 - Mexico 🢒 Body 🢒 Instrument Panel, Gages, and Console 🢒 Indicator/Warning Message Description and Operation

Table 1:	IPC Indicators
Table 2:	DIC Indicators

IPC Indicators

Symbol

Description

ABS: Refer to ABS Description and Operation in Antilock Brake System or to Air ABS Description and Operation in Air Antilock Brake System

APPLY PARK BRAKE

Apply Park Brake: Refer to Park Brake System Description and Operation in Park Brake

AUX BRAKE

Aux Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes

Charge: Refer to Charging System Description and Operation in Engine Electrical

CHECK GAGES

L18: The CHECK GAGES indicator illuminates in the IPC when one of the following occurs:

•	The PCM detects that the engine oil pressure is approximately 5 psi (34 kPa) or below.

The PCM monitors the signal circuit of the engine oil pressure sensor.

•	The PCM detects that the engine coolant temperature is approximately 107°C (225°F) or above.

The PCM monitors the signal circuit of the engine coolant temperature sensor.

The PCM grounds the check gages indicator control circuit in order to illuminate the CHECK GAGES indicator.

The MFAM receives a direct hardwire input from the PCM and the engine will be shutdown, on vehicles equipped with automatic engine shutdown, when one of the following conditions exist:

•	The PCM detects that the engine coolant temperature is at or above 111° C (232° F).

•	The PCM detects that the engine oil pressure is at or below 34 kPa (5 psi).

The MFAM grounds the stoplamp switch signal circuit in order to shut the engine down.

LG5: The CHECK GAGES indicator illuminates in the IPC when one of the following occurs:

•	The MFAM detects that the engine oil pressure is approximately 5 psi (34 kPa) or below.

The MFAM monitors the signal circuit of the engine oil pressure switch.

•	The MFAM detects that the engine coolant temperature is approximately 107°C (225°F) or above.

The MFAM monitors the signal circuit of the engine coolant temperature switch.

The MFAM grounds the check gages indicator control circuit in order to illuminate the CHECK GAGES indicator.

The engine will be shutdown, On vehicles equipped with automatic engine shutdown, when one of the following conditions exist:

•	The MFAM detects that the engine coolant temperature is at or above 111° C (232° F).

•	The MFAM detects that the engine oil pressure is at or below 34 kPa (5 psi).

The MFAM provides a ground for the stoplamp switch interface module in order to shut the engine down.

DRL: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems

Differential Lock: Refer to Locking Differential Description and Operation in Drive Axle - Locking Limited Slip

High Beam: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems

INTAKE HEATER

Low Air Brake Pressure: Refer to Brake Warning System Description and Operation in Air Brakes

LOW COOLANT

Low Coolant: Refer to Cooling System Description and Operation in Engine Cooling

PARK BRAKE

Park Brake: Refer to Park Brake System Description and Operation in Park Brake

PRIMARY BRAKE

Primary Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes

SERVICE ENGINE SOON

Malfunction Indicator Lamp (MIL): Refer to Powertrain Control Module Description in Engine Controls - 8.1 L or to the Cat© Medium Duty Diesel Manual - LG 5

SERVICE PARK BRAKE

Service Park Brake: Refer to Park Brake System Description and Operation in Park Brake

Turn Signals: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems

DIC Indicators

Symbol	Description
CHANGE OIL	The CHANGE OIL indicator illuminates in the driver information center (DIC) when the powertrain control module (PCM) determines that the engine oil should be changed. The PCM provides a ground for the change oil indicator control circuit in order to illuminate the CHANGE OIL indicator. After the oil is changed, reset the engine oil monitor. Refer to GM Oil Life System Resetting in Maintenance and Lubrication.
	The Check Transmission indicator illuminates in the DIC when the transmission control module (TCM) detects certain malfunctions in the transmission. The TCM grounds the check trans indicator control circuit in order to illuminate the Check Transmission indicator.
ENGINE OVERSPEED	The ENGINE OVERSPEED indicator illuminates in the DIC when the PCM detects that the engine speed range is between 3,600 and 4,000 RPM. The PCM grounds the engine overspeed indicator control circuit in order to illuminate the ENGINE OVERSPEED indicator.
	The fasten safety belt indicator illuminates in the DIC, for approximately 8 seconds, when the seat belt alarm module detects that the ignition transitions to ON. The seat belt alarm module supplies voltage to the seat belt indicator voltage circuit in order to illuminate the fasten safety belt indicator.
REDUCED ENGINE POWER	The REDUCED ENGINE POWER indicator illuminates in the DIC when the PCM detects a malfunction in the throttle actuator control system. The PCM grounds the reduced engine power indicator control circuit in order to illuminate the REDUCED ENGINE POWER indicator.
SERVICE TRANS FILTER	The SERVICE TRANS FILTER indicator illuminates in the DIC when the transmission fluid filter differential switch detects a pressure differential increase of approximately 41 kPa (6 psi). The transmission fluid filter differential switch grounds the service trans filter indicator control circuit in order to illuminate the SERVICE TRANS FILTER indicator.
	Trailer ABS: Refer to Air ABS Description and Operation in Air Antilock Brake System