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 MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 403 (AUTOMATIC TRANSMISSION - ALLISON (INTRODUCTION, SERVICE & REPLACEMENT))DESCRIPTION AND OPERATIONEXTERNALLY GENERATED ELECTRONIC INTERFERENCE (SPEED SENSOR SIGNALS)
2006 Chevrolet Suburban K2500, 6.0 U
Externally Generated Electronic Interference (Speed Sensor Signals)
2006 Chevrolet Suburban K2500, 6.0 USECTION Externally Generated Electronic Interference (Speed Sensor Signals)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Use the following procedures in order to determine if speed sensor signals, generated by a source external to the transmission or wiring harness, are present:
- Turn the ignition ON.
- Keep the engine OFF.
- If the transmission control module (TCM) is ON, install the scan tool.
- Read the speed sensor signals.
- If a speed sensor signal is something other than one (1), there is a short to another circuit that is carrying an AC or pulse width modulated (PWM) signal.
- Measure the resistance of the sensor.
- Inspect for shorts to other circuits within the harness or transmission connector.
- Inspect to ensure there is no conductive material inside the connector.
- Inspect to ensure the speed sensor circuit wires are a twisted pair.
- Inspect to ensure a properly grounded drain wire.
- Inspect for the presence of a strong external AC signal.
- Repair or replace parts as required.
IMPORTANT:
If false speed signals were present at the previous shutdown, the TCM might still be ON, even though the ignition is OFF. The scan tool is powered by ignition power. The ignition must be ON in order to use the scan tool to read the speed signals.
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.