OBD code P0078 indicates a fault with the Exhaust Valve Timing Control Magnet Retarder in the engine.
Symptoms include the Engine Light being ON.
The issue is typically caused by a faulty magnet, wiring harness issues, or poor electrical connections.
While not a severe problem, it should be addressed promptly.
To fix it, inspect the wiring harness, connectors, and related components for any damage or corrosion.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the p0078 OBD Code
The vehicle may experience issues related to the ambient air temperature sensor circuit.
- Symptoms: Engine Light ON.
- Possible lack of power during acceleration.
- Engine may run rough or stall.
- Turbocharger may not work properly.
Causes of the p0078 OBD Code
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P0078 code typically indicates an issue with the exhaust valve control solenoid circuit.
- P0078 can be caused by a faulty Exhaust Valve Timing Control Magnet Retarder.
- A malfunctioning Exhaust Valve Timing Control Magnet Retarder harness that is open or shorted.
- An Exhaust Valve Timing Control Magnet Retarder circuit with poor electrical circuit connector.
Fixing Error Code p0078 Step By Step
Repairing a faulty P0078 code involves addressing issues with the exhaust valve control solenoid circuit.
- To fix OBDII code P0078, first, review the possible causes related to the code.
- Visually inspect the wiring harness and connectors associated with the intake valve control solenoid circuit.
- Check for any damaged components and ensure the connector pins are not broken, bent, pushed out, or corroded.
- If no issues are found during the visual inspection, test the intake valve control solenoid for proper operation.
- Replace the intake valve control solenoid if it is faulty.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Finally, test drive the vehicle to verify that the P0078 code does not return, indicating a successful repair.
Cost Of Fixing p0078 Fault Code
Diagnosing and repairing fault code P0078 typically involves addressing an issue with the exhaust valve control solenoid circuit.
The cost to diagnose and fix OBD code P0078 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the repair needed.
Details of the p0078 OBD Code
P0078 indicates a high voltage issue in the intake valve control solenoid circuit.
OBD code P0078 means that a low voltage condition has been detected in the Intake Valve Control Solenoid Circuit Bank 1. This code is triggered by the Engine Control Module (ECM) when it detects a voltage signal below the specified range from the intake valve control solenoid in Bank 1. The intake valve control solenoid is part of the variable valve timing system and is responsible for controlling the intake valve timing to improve engine performance and efficiency.
Mechanic’s Tech Notes
Code P0078 relates to an issue with the exhaust valve control solenoid circuit.
OBDII code P0078 relates to an issue with the exhaust valve control solenoid circuit.
To diagnose this, use a voltmeter to check the voltage at the exhaust valve control solenoid and its wiring harness.
Ensure there are no breaks or shorts in the wiring.
Use a scan tool to monitor the solenoid’s operation and check for any stored codes in the Transmission Control Module (TCM).
If the solenoid is not functioning correctly, it may need to be replaced.
Additionally, inspect the connector pins for any damage or corrosion that could be affecting the circuit.
FAQ
OBD code P0078 indicates an issue with the Exhaust Valve Timing Control Magnet Retarder. Symptoms include Engine Light ON. Fix: Inspect wiring harness and connectors for damage or corrosion.
Common symptoms of OBD code P0078 include Engine Light ON. Causes may be a faulty Exhaust Valve Timing Control Magnet Retarder. Fix: Inspect wiring harness and connectors for damage.
Diagnose and repair OBD code P0078 by checking for a faulty Exhaust Valve Timing Control Magnet Retarder, open/shorted harness, or poor electrical circuit connector.
Wrap Up
If your check engine light is on and you’re experiencing issues with the intake valve control solenoid, you may see OBDII code P0078. This could be caused by a faulty intake valve control solenoid, wiring issues in the intake valve control solenoid circuit, or low engine oil levels affecting the solenoid’s operation.
To address OBDII code P0078, start by checking the wiring harness and connectors for any signs of damage or corrosion.
Test the intake valve control solenoid for proper operation and replace it if necessary.
Ensure the engine oil level is
