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 133 (ENGINE CONTROLS - TESTS W/CODES - 4.3L)
1995 GMC Suburban K2500, 6.5 F
Section 133 (Engine Controls - Tests W/Codes - 4.3L)
1995 GMC Suburban K2500, 6.5 FSECTION Section 133 (Engine Controls - Tests W/Codes - 4.3L)
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Sonoma, and 1995 GMC Safari. 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 - All Models
- Code 14, Coolant Sensor Signal Voltage Low - All Models
- Code 15, Coolant Sensor Signal Voltage High - All Models
- Code 16, VSS Buffer Fault - "S" & "T" Series, (VIN W) Utility A/T & (VIN Z) Pickup A/T
- Code 21, TPS Signal Voltage High - All Models
- Code 22, TPS Signal Voltage Low - All Models
- Code 23, Intake Air Temp. Low - "L", "M", "S" & "T" Series
- Code 24, VSS Transmission Output Signal - A/T - All Models
- Code 25, Intake Air Temperature High - "L", "M", "S" & "T" Series
- Code 28, Transmission Range Pressure Switch - All Models
- Code 32, EGR Circuit Error BACKPRESSURE EGR With Solenoid - "C", "K" & "P" Series
- Code 32, EGR Circuit Error With EVRV Solenoid - "C", "G", "K" & "P" Series
- Code 32, EGR Circuit Error - "L", "M", "S" & "T" Series W/ Linear EGR
- Code 32, EGR Circuit Error - "C", "G" & "K" Series W/ Linear EGR
- Code 33, Map Sensor Signal Voltage High - All Models
- Code 34, Map Sensor Signal Voltage Low - All Models
- Code 35, Idle Speed Error - All Models
- Code 36, Idle Speed Actuator Fault - "C", "G", "K" & "P" Series A/T
- Codes 37/38, TCC Brake Switch On/Off - All Models A/T
- Code 39, TCC Stuck Off - "C", "G", "K" & "P" Series With 4L80-E Transmission
- Code 42, Ignition Control - All Models
- Code 43, Knock Sensor W/O Spark Module (Dual Sensors)
- Code 43, Knock Sensor Without Spark Module (Single Sensor)
- Code 43, Knock Sensor With Spark Control Module "C", "K" & "P" Series
- Code 44, Lean Exhaust Indication - All Models
- Code 45, Rich Exhaust Indication - All Models
- Code 51, Prom Error (Faulty Or Incorrect Prom)
- Code 52, Faulty CALPAK
- Code 52/53, System Voltage High - All Models
- Code 54, Fuel Pump Circuit - All Models
- Code 55, ECM/Pcm Error
- Code 58, Transmission Fluid Temperature High - All Models
- Code 59, Transmission Fluid Temperature Low - All Models
- 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 - All Models
- Code 73, Pressure Control Solenoid (Current Error) - All Models
- Code 74, Transmission Input Speed Error 4L80-E Transmission
- Code 75, System Voltage Low - All Models
- Code 79, Transmission Fluid Temperature High - All Models
- Code 81, Transmission 2-3 Error - All Models
- Code 82, Transmission 1-2 Error - All Models
- Code 83, TCC Solenoid Circuit Fault - All Models
- Code 85, Undefined Gear Ratio - All Models
- Code 86, Low Gear Ratio Error - All Models
- Code 87, High Gear Ratio Error - All Models
- Code P0106, Map Sensor Range Problem - "S" & "T" Series 4.3L (VIN W)
- Code P0107, Map Sensor CKT - "S" & "T" Series 4.3L (VIN W)
- Code P0108, Map Sensor CKT - "S" & "T" Series 4.3L (VIN W)
- Code P0112, IAT Sensor Circuit Low Input - "S" & "T" Series 4.3L (VIN W)
- Code P0113, IAT Sensor Circuit High Input - "S" & "T" Series 4.3L (VIN W)
- Code P0117, Coolant Temperature Sensor Temperature Low "S" & "T" Series 4.3L (VIN W)
- Code P0118, Coolant Temperature Sensor Temperature High "S" & "T" Series 4.3L (VIN W)
- Code P0121, TP Sensor Range/Performance Problem "S" & "T" Series 4.3L (VIN W)
- Code P0122, Throttle Position Sensor Signal Low "S" & "T" Series 4.3L (VIN W)
- Code P0123, Throttle Position Sensor Signal High "S" & "T" Series 4.3L (VIN W)
- Code P0123, Throttle Position Sensor Signal High 4.3L "S" & "T" Series (VIN Z)
- Code P0125, Coolant Sensor Excessive Time To Closed Loop "S" & "T" Series 4.3L (VIN W)
- Code P0131, Heated Oxygen Sensor Low Signal Voltage (Lean) "S" & "T" Series 4.3L (VIN W)
- Code P0132, Heated O2 Sensor High Signal Voltage (Rich) "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P0133, Heated Oxygen Sensor Slow Response
- Code P0134, Heated Oxygen Sensor Open Circuit - "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P0135, Heated Oxygen Sensor Heater Circuit Malfunction "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P0137, Heated Oxygen Sensor Low Signal Voltage (Lean) "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 2
- Code P0138, Heated Oxygen Sensor High Signal Voltage (Rich) "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 2
- Code P0139, Heated Oxygen Sensor Open Circuit "S" & "T" Series 4.3L (VIN Z) Bank 1, Sensor 2
- Code P0140, Heated Oxygen Sensor Open Circuit "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 2
- Code P0141, Heated Oxygen Sensor Heater Circuit Malfunction "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 2
- Code P0171, Fuel Trim Lean - "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P0171, Lean Exhaust - "S" & "T" Series 4.3L (VIN Z)
- Code P0172, Fuel Trim Rich - "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P0172, Rich Exhaust - "S" & "T" Series 4.3L (VIN Z)
- Code P0300, Random Misfire Detected - "S" & "T" Series 4.3L (VIN W)
- Code P0301-306, Cylinders 1-6 Misfiring - "S" & "T" Series 4.3L (VIN W)
- Code P0320, Ignition Control Error - "S" & "T" Series 4.3L (VIN Z)
- Code P0325/326, Knock Sensor Open Or Shorted "S" & "T" Series 4.3L (VIN W)
- Code P0327, Knock Sensor Grounded - "S" & "T" Series 4.3L (VIN Z)
- Code P0328, Knock Sensor Open - "S" & "T" Series 4.3L (VIN Z)
- Code P0337/338, Crank Sensor Input - "S" & "T" Series 4.3L (VIN W)
- Code P0340, Cam Sensor Malfunction - "S" & "T" Series 4.3L (VIN W)
- Code P0341, Cam Sensor Range - "S" & "T" Series 4.3L (VIN W)
- Code P0400, EGR Error - "S" & "T" Series 4.3L (VIN Z)
- Code P0401, EGR Flow Test Failure - "S" & "T" Series 4.3L (VIN W)
- Code P0420, Catalyst Efficiency Low (Bank 1)
- Code P0441, Incorrect EVAP Purge - "S" & "T" Series 4.3L (VIN W)
- Code P0500, VSS Circuit - "S" & "T" Series
- Codes P0502/P0503, VSS Circuit Low/High - "S" & "T" Series 4.3L (VIN W)
- Code, P0506/507 IAC Counts Low/High - "S" & "T" Series 4.3L (VIN W)
- Code 560, System Voltage Malfunction - "S" & "T" Series 4.3L (VIN W)
- Code P0703 - TCC Brake Input Circuit "S" & "T" Series 4.3L (VIN W)
- Code P0712, Transaxle Temperature Sensor Signal Voltage Low "S" & "T" Series 4.3L (VIN W)
- Code P0713, Transaxle Temperature Sensor Signal Voltage High "S" & "T" Series 4.3L (VIN W)
- Code P0742, TCC Stuck On - "S" & "T" Series 4.3L (VIN W)
- Code P0748, Pressure Control Solenoid - "S" & "T" Series 4.3L (VIN W)
- Code P0753, 1-2 Shift Solenoid - "S" & "T" Series 4.3L (VIN W)
- Code P0756, 2-3 Shift Solenoid Performance - "S" & "T" Series 4.3L (VIN W)
- Code P0758, 2-3 Shift Solenoid Electrical "S" & "T" Series 4.3L (VIN W)
- Code P1106, Map Intermittent High - "S" & "T" Series 4.3L (VIN W)
- Code P1107, Map Intermittent Low - "S" & "T" Series 4.3L (VIN W)
- Code P1111, IAT Intermittent High - "S" & "T" Series 4.3L (VIN W)
- Code P1112, IAT Intermittent Low - "S" & "T" Series 4.3L (VIN W)
- Code P1114, ECT Intermittent Low - "S" & "T" Series 4.3L (VIN W)
- Code P1115, ECT Intermittent High - "S" & "T" Series 4.3L (VIN W)
- Code P1121, TP Sensor Intermittent High - "S" & "T" Series 4.3L (VIN W)
- Code P1122, TP Sensor Intermittent Low - "S" & "T" Series 4.3L (VIN W)
- Code P1133, Oxygen Sensor Insufficient Activity "S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1
- Code P1221, Fuel Pump Secondary System Circuit Low "S" & "T" Series 4.3L (VIN W)
- Code P1222, Fuel Pump Voltage Low - "S" & "T" Series 4.3L (VIN Z)
- Code P1345, Crankshaft/Camshaft Sensor Correlation Error "S" & "T" Series 4.3L (VIN W)
- Code P1351, Est Output High - "S" & "T" Series 4.3L (VIN W)
- Code P1361, Est Not Toggling - "S" & "T" Series 4.3L (VIN W)
- Code P1406, EGR Valve Pintle Position - "S" & "T" Series 4.3L (VIN W) (1 Of 2)
- Code P1406, EGR Valve Pintle Position - "S" & "T" Series 4.3L (VIN W) (2 Of 2)
- Code P1441, Evaporative System Continuous Purge "S" & "T" Series 4.3L (VIN W)
- Code P1442, Evaporative System Vacuum Switch Static Test Malfunction - "S" & "T" Series 4.3L (VIN W)
- Code P1508/1509, Idle Speed Low/High - "S" & "T" Series 4.3L (VIN W)
- Code P1632, System Voltage High - "S" & "T" Series 4.3L (VIN Z)
- Code P1810, Transmission Range Switch Assembly Circuit "S" & "T" Series 4.3L (VIN W)
- Code P1812, Trans Fluid OVERTEMP - "S" & "T" Series 4.3L (VIN W)
- Code P1860, TCC PWM Solenoid Electrical Circuit "S" & "T" Series 4.3L (VIN W)
- Code P1864, TCC Solenoid Electrical Circuit "S" & "T" Series 4.3L (VIN W)
- Code P1870, Transmission Component Slipping "S" & "T" Series 4.3L (VIN W)
- Code P1886, 3-2 Solenoid Electrical Circuit "S" & "T" Series 4.3L (VIN W)
- Summary
- Wiring Diagrams
- Astro & Safari
- "C" & "K" Series With A/T
- "C" & "K" Series Pickup & Sierra - With M/T
- "P" Series - With M/T
- "P" Series - Commercial Van/MOTORHOME - With 4L80-E
- "S" & "T" Blazer, Jimmy, Pickup & SONOMA - VIN W W/Pcm
- "S" & "T" Blazer, Jimmy, Pickup & SONOMA - VIN W W/VCM
- "S" & "T" Blazer, Jimmy, Pickup & SONOMA - VIN Z W/Pcm
- "S" & "T" Blazer, Jimmy, Pickup & SONOMA - VIN Z W/VCM
- Van - With 4L60-E
- Van - With 4L80-E
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.