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 121 (ENGINE CONTROLS - TESTS W/CODES - 2.2L)
1995 GMC Suburban K2500, 6.5 F
Section 121 (Engine Controls - Tests W/Codes - 2.2L)
1995 GMC Suburban K2500, 6.5 FSECTION Section 121 (Engine Controls - Tests W/Codes - 2.2L)
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 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 23, Intake Air Temperature Low
- Code 24, Vehicle Speed Sensor - M/T
- Code 24, VSS Transmission Output Signal A/T
- Code 25, Intake Air Temperature High
- Code 28, Transmission Range Pressure Switch
- Code 32, EGR Circuit Error BACKPRESSURE EGR With Solenoid
- Code 32, EGR Circuit Error With Linear EGR
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 35, Idle Speed Error
- Codes 37/38, TCC Brake Switch On/Off
- Code 41, 1X Signal Error
- Code 42, Ignition Control
- Code 43, Knock Sensor Without Spark Module (Dual Sensors)
- Code 43, Knock Sensor Without Spark Module (Single Sensor)
- 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 69, Torque Converter Clutch Stuck On 4L60-E Transmission
- Code 72, VSS Circuit Loss Transmission Output Signal
- Code 73, Pressure Control Solenoid (Current Error)
- Code 75, System Voltage Low
- Code 79, Transmission Fluid Temperature High
- Code 81, Transmission 2-3 Error
- Code 82, Transmission 1-2 Error
- Summary
- Wiring Diagrams
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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.