P0634 2016 GMC Sierra Code - Control Module Overtemperature
Quick Answer
The Transmission Control Module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable parts. Common causes include Obstructions in the airflow of the radiator or transmission cooler, Kinked or damaged transmission fluid lines, Damage to the transmission cooler. 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
- P0634 2016 GMC Sierra indicates Control Module Overtemperature.
- Common causes
- Common causes include Obstructions in the airflow of the radiator or transmission cooler, Kinked or damaged transmission fluid lines, Damage to the transmission cooler.
- 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 P0634 2016 GMC Sierra Description
What are the Possible Causes of the DTC P0634 2016 GMC Sierra?
- Obstructions in the airflow of the radiator or transmission cooler
- Kinked or damaged transmission fluid lines
- Damage to the transmission cooler
How to Fix the DTC P0634 2016 GMC Sierra?
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 P0634 2016 GMC Sierra 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.
Need more information about the P0634 2016 GMC Sierra code?
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Frequently Asked Questions about P0634 2016 GMC Sierra Code
1. What does the OBDII code P0634 mean for a 2016 GMC Sierra?
P0634 indicates the "Control Module Overtemperature," meaning the powertrain control module (PCM) has detected excessive operating temperatures.
2. What are the common symptoms of code P0634 in a GMC Sierra?
Symptoms may include reduced engine performance, erratic shifting, engine stalling, or warning lights like the check engine light.
3. What causes the P0634 code to appear?
Potential causes include a faulty PCM, poor ventilation around the module, electrical issues, or engine overheating affecting PCM temperature.
4. Can driving with code P0634 damage my GMC Sierra?
Yes, prolonged operation with this code can lead to further overheating and possible damage to the PCM or other connected systems.
5. How can I diagnose the P0634 code in my GMC Sierra?
Start by checking engine temperatures, inspecting PCM connections for damage or corrosion, and ensuring adequate airflow to the PCM.
6. What tools are needed to troubleshoot code P0634?
A diagnostic scan tool, a multimeter, and sometimes a thermal imaging device to measure PCM temperature are helpful.
7. Can a faulty PCM cause the P0634 code?
Yes, a malfunctioning PCM can fail to regulate its temperature properly, leading to this code.
8. What should I check if my GMC Sierra triggers code P0634?
Inspect the wiring and connectors around the PCM for damage, check cooling system performance, and ensure proper PCM mounting and ventilation.
9. How do I fix the P0634 code on a 2016 GMC Sierra?
Repairs may include replacing or repairing the PCM, fixing wiring issues, improving ventilation, or resolving underlying engine cooling problems.
10. Is P0634 a serious issue for my GMC Sierra?
Yes, this code indicates a critical problem that can affect engine performance and PCM functionality, requiring immediate attention.
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