P077D 2018 GMC Sierra Code - Transmission Output Speed Sensor Circuit High Voltage
Quick Answer
The P077D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Issues with the vehicle's control module. 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
- P077D 2018 GMC Sierra indicates Transmission Output Speed Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty output speed sensor, Damaged wiring or connectors in the sensor circuit, Issues with the vehicle's control module.
- 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.
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Code P077D 2018 GMC Sierra Description
The P077D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Transmission Output Speed Sensor Circuit High Voltage. This code is specifically related to the output speed sensor in the transmission, which is responsible for monitoring the speed of the output shaft. The output speed sensor plays a crucial role in the transmission's operation by providing data to the vehicle's control module to ensure proper shifting and overall performance.
Common Causes of P077D 2018 GMC Sierra
- Faulty output speed sensor
- Damaged wiring or connectors in the sensor circuit
- Issues with the vehicle's control module
- Low transmission fluid levels
- Mechanical damage to the transmission
Symptoms of P077D 2018 GMC Sierra
- Harsh or delayed shifting
- Erratic transmission behavior
- Decreased fuel efficiency
- Illuminated check engine light
- Transmission slipping
How to Fix P077D 2018 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage reading, using a scan tool to retrieve the DTC and pinpoint the issue.
- Inspect the output speed sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
- Check the vehicle's control module for any faults or programming issues that may be causing the high voltage reading.
- Test the transmission fluid levels and quality, topping off or replacing as needed to ensure proper lubrication.
- Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.
Cost to Fix P077D 2018 GMC Sierra
The cost of repairing a P077D code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get a few quotes from different shops to ensure you're getting a fair price.
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