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P077C Chevrolet Code - Transmission Output Speed Sensor Circuit Low Voltage

Quick Answer

The P077C code for Chevrolet vehicles indicates a problem with the transmission output speed sensor circuit registering low voltage. Common causes include Faulty transmission output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P077C Chevrolet indicates Transmission Output Speed Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty transmission output speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P077C Chevrolet Description

The P077C code for Chevrolet vehicles indicates a problem with the transmission output speed sensor circuit registering low voltage. The transmission output speed sensor is a crucial component that monitors the speed of the output shaft on the transmission. This information is used by the vehicle's engine control module to calculate shift points and ensure smooth operation of the transmission. When the voltage from the sensor falls below the specified range, it triggers the P077C code.

OBDII Code P077C Chevrolet - Transmission Output Speed Sensor Circuit Low Voltage
P077C Chevrolet Code - Transmission Output Speed Sensor Circuit Low Voltage

Common Causes of P077C Chevrolet

  1. Faulty transmission output speed sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or contamination in the sensor connections
  4. Issues with the engine control module
  5. Electrical problems in the vehicle's wiring system

Symptoms of P077C Chevrolet

  1. Rough shifting
  2. Delayed gear engagement
  3. Decreased fuel efficiency
  4. Transmission slippage
  5. Illumination of the check engine light

How to Fix P077C Chevrolet

  1. Begin by diagnosing the issue using a scan tool to confirm the P077C code and identify the specific cause.
  2. Inspect the transmission output speed sensor and its wiring for any damage or corrosion. Replace the sensor if necessary.
  3. Check the wiring and connectors in the sensor circuit for any faults or loose connections. Repair or replace as needed.
  4. Clear the code from the vehicle's computer using the scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the underlying issue.

Cost to Fix P077C Chevrolet

The cost of repairing a transmission output speed sensor circuit low voltage issue can vary depending on the extent of the damage and the cost of parts and labor. On average, the repair for this code can range from $150 to $400. However, it's important to note that labor rates can vary significantly between auto repair shops, so it's recommended to obtain quotes from multiple sources to ensure a competitive price. Additionally, the cost may increase if additional repairs or replacements are needed beyond the sensor itself.

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Information for Specific Chevrolet Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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