P0724
Output Speed Sensor Intermittent
Powertrain Transmission Control Transmission Speed Sensing 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your transmission's output speed sensor is sending inconsistent signals to the engine computer, like a speedometer that keeps cutting out. This prevents the transmission from shifting smoothly and adapting to driving conditions properly.

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Symptoms You May Notice
3 known symptoms for this code
Transmission shifting harshly or at wrong RPMs
Check Engine Light illumination
Possible limp mode or reduced fuel economy
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECM monitors voltage pulses from the output speed sensor (OSS) to track transmission fluid speed and confirm gear engagement. It detects intermittent signal loss when voltage drops below threshold or pulses become irregular, indicating a failing sensor or wiring issue.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
OSS Signal Voltage 0.5-4.5V with consistent pulse frequency Intermittent dropouts or no signal for >500ms
Signal Frequency Proportional to transmission output speed Random signal loss or erratic frequency changes
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Output Speed Sensor connector
Inspect and clean the OSS connector at the transmission for corrosion, moisture, or loose pins.
2
OSS wiring harness
Check the sensor wiring for cuts, pinches, or damaged insulation between sensor and ECM.
3
Output Speed Sensor
Replace the sensor if wiring and connectors are clean; sensors typically fail after 100k+ miles.