P0878 2018 Chevrolet Silverado Code - Transmission Fluid Pressure Switch 4 Circuit High Voltage
Quick Answer
The Transmission Fluid Pressure (TFP) switch 4 is part of the Transmission Control Solenoid Valve Assembly which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly. 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
- P0878 2018 Chevrolet Silverado indicates Transmission Fluid Pressure Switch 4 Circuit High Voltage.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly.
- 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 P0878 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0878 2018 Chevrolet Silverado?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Transmission Control Solenoid Valve Assembly
- Transmission Control Solenoid Valve Assembly harness is open or shorted
- Transmission Control Solenoid Valve Assembly circuit poor electrical connection
How to Fix the DTC P0878 2018 Chevrolet Silverado?
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 P0878 2018 Chevrolet Silverado 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 P0878 2018 Chevrolet Silverado Code
1. What does the OBDII code P0878 mean on a 2018 Chevrolet Silverado?
P0878 indicates that the Transmission Control Module (TCM) has detected high voltage in the Transmission Fluid Pressure Switch 4 circuit.
2. What are the common symptoms of code P0878 in a 2018 Chevy Silverado?
Symptoms may include erratic shifting, transmission slipping, harsh gear engagement, or the vehicle entering limp mode.
3. What causes the P0878 code to appear in a Silverado?
Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning TCM.
4. Can driving with code P0878 damage my 2018 Chevrolet Silverado?
Driving with this code can lead to further transmission damage if not addressed, especially if the vehicle is experiencing shifting issues or operating in limp mode.
5. How do I diagnose the P0878 code on a 2018 Silverado?
Diagnose the issue by checking the transmission fluid level, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure sensor with a multimeter.
6. How do I fix the P0878 code on my 2018 Silverado?
Repairs may involve replacing the transmission fluid pressure sensor, repairing damaged wiring, clearing debris from fluid passages, or reprogramming the TCM if necessary.
7. Can low transmission fluid cause the P0878 code in a 2018 Silverado?
Yes, low or contaminated transmission fluid can lead to improper pressure readings and trigger this code.
8. How much does it cost to repair a P0878 code on a 2018 Chevrolet Silverado?
The cost depends on the exact issue but typically ranges from $150 to $500, including parts and labor, for sensor replacement or wiring repairs.
9. Can a faulty TCM cause the P0878 code in a Silverado?
Yes, a malfunctioning TCM can send incorrect signals to the pressure switch circuit, causing the code to appear.
10. Is it safe to clear the P0878 code without fixing the issue on a 2018 Silverado?
Clearing the code without addressing the root cause is not recommended, as the underlying problem can persist and lead to further damage.
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