Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1995FORWARD CONTROL 7.4 NREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION DIAGNOSIS - 4L80-EDIAGNOSTIC CHARTS - GASOLINEDTCS 37/38, TCC BRAKE SWITCH ON/OFFNOTES

1995 Chevrolet Forward Control 7.4 N

DTCS 37/38, TCC Brake Switch On/Off: Notes

1995 Chevrolet Forward Control 7.4 NSECTION Notes

Fig 1: DTC 37/38 - Circuit Diagram (Gasoline)

G95I27621

Courtesy of GENERAL MOTORS CORP.

The normally closed brake switch supplies battery voltage to control module. Signal voltage will drop to zero volts when brake pedal is applied.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks if voltage is available at brake switch.
Checks brake switch function.
Checks circuit from brake switch to control module.

Fig 2: DTC 37/38 - Troubleshooting Chart (Gasoline)

G94D35066

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.