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 MANUALSGMC1995SUBURBAN K2500, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 137 (ENGINE CONTROLS - TESTS W/CODES - 5.0L)
1995 GMC Suburban K2500, 6.5 F
Section 137 (Engine Controls - Tests W/Codes - 5.0L)
1995 GMC Suburban K2500, 6.5 FSECTION Section 137 (Engine Controls - Tests W/Codes - 5.0L)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1995 GMC Vandura, 1995 GMC Rally, 1995 GMC Pickup, 1995 Chevrolet Sportvan, and 1995 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Model Identification
- Introduction
- Self-Diagnostic System
- Trouble Code Charts
- Notes
- Code 13, Open Oxygen Sensor Circuit
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 16, VSS Buffer Fault
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- Code 24, VSS - M/T
- Code 28, Transmission Range Pressure Switch
- Code 32, EGR Circuit Error BACKPRESSURE EGR With Solenoid "G" Series
- Code 32, EGR Circuit Error With EVRV Solenoid
- Code 32, EGR CKT Error - "C" & "K" Series W/ Linear EGR
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 35, Idle Speed Error
- Code 36, Idle Speed Actuator Fault - A/T
- Codes 37/38, TCC Brake Switch On/Off
- Code 39, TCC Stuck Off - 4L80-E Transmission
- Code 42, Ignition Control
- Code 43, Knock Sensor Without Spark Module (Dual Sensors)
- Code 43, Knock Sensor Without Spark Module (Single Sensor)
- Code 43, Knock Sensor With Spark Control Module
- Code 44, Lean Exhaust Indication
- Code 45, Rich Exhaust Indication
- Code 51, Prom Error (Faulty Or Incorrect Prom)
- Code 52, Faulty CALPAK
- Code 52/53, System Voltage High
- Code 55, ECM/Pcm Error
- Code 54, Fuel Pump Circuit
- Code 58, Transmission Fluid Temperature High
- Code 59, Transmission Fluid Temperature Low
- Code 66, 3-2 Control Solenoid CKT Fault 4L60-E Transmission
- Code 67, TCC Solenoid Circuit Check - 4L60-E Transmission
- Code 68, Overdrive Ratio Error - 4L80-E Transmission
- Code 69, Torque Converter Clutch Stuck On 4L60-E Transmission
- Code 69, Torque Converter Clutch Stuck On 4L80-E Transmission
- Code 72, VSS Circuit Loss Trans Output Signal
- Code 73, Pressure Control Solenoid (Current Error)
- Code 74, Transmission Input Speed Error 4L80-E Transmission
- Code 75, System Voltage Low
- Code 79, Transmission Fluid Temperature High
- Code 81, Transmission 2-3 Error
- Code 82, Transmission 1-2 Error
- Code 83, TCC Solenoid Circuit Fault
- Code 85, Undefined Gear Ratio
- Code 86, Low Gear Ratio Error
- Code 87, High Gear Ratio Error
- Summary
- Wiring Diagrams
RENDER: 1.0x
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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.