Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a part inside the car's transmission, like a clutch, is slipping when it shouldn't be. It's like when your shoes slip on a wet floor.
The transmission control module has detected that one of the friction elements, specifically Element B, is slipping beyond acceptable limits.
The P079B code indicates that the transmission control module (TCM) has detected excessive slip in the friction element B. This could be due to worn clutches, low hydraulic pressure, or a malfunctioning solenoid that controls the application of the clutch. The slipping is detected by comparing the input and output speeds of the transmission components.
• Check Engine Light is on
• Transmission slipping or erratic shifting
• Reduced fuel efficiency
• Worn or damaged clutch plates
• Low transmission fluid level or pressure
• Faulty transmission solenoid
Transmission: A system in a vehicle that transmits power from the engine to the wheels.
Friction Element: Components like clutches that engage and disengage to control power flow in the transmission.
• Check transmission fluid level and condition
• Inspect transmission for leaks
• Perform a transmission pressure test
• Replace worn or damaged clutch plates
• Repair any transmission fluid leaks
• Replace or repair faulty solenoids
• OBD-II scanner
• Transmission pressure gauge
• Basic hand tools
$300 - $1500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid changes
• Avoid aggressive driving
• Ensure proper transmission maintenance
Transmission Performance
• Avoid driving aggressively until repaired
• Have the transmission inspected by a professional
• Monitor for any changes in vehicle performance
Transmission repairs may be covered under powertrain warranty if the vehicle is within the warranty period.
This code has been associated with vehicles that have high mileage or have experienced heavy towing or hauling.
Moderate – It is advisable to address this issue soon to prevent further transmission damage.
Ignoring transmission issues can lead to unsafe driving conditions and may cause further damage to the vehicle.
• Vehicle must be at operating temperature
• Transmission must be in gear and under load
The friction element is located within the transmission assembly, which is typically mounted to the rear of the engine.
Q: Can I drive with a P079B code?
A: It's not recommended to drive for long periods as it may cause further damage to the transmission.
Q: How do I clear a P079B code?
A: After repairs, the code can be cleared using an OBD-II scanner.
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