P077D Buick Code - Transmission Output Speed Sensor Circuit High Voltage
Quick Answer
The Output Speed Sensor (OSS) is a hall-effect type sensor. Common causes include Faulty Transmission Output Speed Sensor (OSS), Transmission Output Speed Sensor harness is open or shorted, Transmission Output Speed Sensor circuit poor electrical connection. 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 Buick indicates Transmission Output Speed Sensor Circuit High Voltage.
- Common causes
- Common causes include Faulty Transmission Output Speed Sensor (OSS), Transmission Output Speed Sensor harness is open or shorted, Transmission Output Speed Sensor circuit poor electrical connection.
- 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.
Code P077D Buick Description
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the vehicle speed sensor signal circuit voltage is 4.75 V or greater for 0.8 s.
What are the Possible Causes of the DTC P077D Buick?
- Faulty Transmission Output Speed Sensor (OSS)
- Transmission Output Speed Sensor harness is open or shorted
- Transmission Output Speed Sensor circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P077D Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P077D Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P077D Buick Code
1. What does the OBDII code P077D mean for a Buick?
P077D indicates a high voltage issue in the transmission output speed sensor circuit, which monitors the rotational speed of the transmission's output shaft.
2. What are common symptoms of code P077D in a Buick?
Symptoms may include erratic shifting, transmission slipping, poor acceleration, or the transmission staying in one gear.
3. What causes code P077D in a Buick?
Common causes include a faulty output speed sensor, damaged wiring or connectors, electrical shorts, or issues with the vehicle’s PCM (Powertrain Control Module).
4. Can I still drive my Buick with code P077D?
While the vehicle may still be drivable, driving with this code can cause further damage to the transmission and impact performance. It’s best to address the issue promptly.
5. How do I diagnose code P077D in my Buick?
Start by checking the transmission output speed sensor, inspecting wiring and connectors for damage, and using a multimeter to test for proper voltage and continuity.
6. How can I fix code P077D in a Buick?
Repairs may include replacing the transmission output speed sensor, repairing damaged wiring, or updating/reprogramming the PCM if necessary.
7. How much does it cost to repair code P077D in a Buick?
Costs vary depending on the repair needed, but replacing the sensor typically costs between $150 and $300, including labor.
8. Can a faulty PCM cause code P077D in a Buick?
Yes, a malfunctioning PCM can misinterpret sensor signals or fail to regulate the circuit voltage properly, leading to this code.
9. Will code P077D trigger the check engine light on my Buick?
Yes, the check engine light will likely illuminate when code P077D is detected.
10. How can I prevent code P077D from occurring in my Buick?
Regular maintenance, including inspecting wiring and sensors during routine service, can help prevent this issue from developing.
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