P0080: Exhaust Valve Control Solenoid Circuit High (Bank 1)
Is your scanner showing P0080?
No worries. We'll show you what it means and how to deal with it.
P0080: Exhaust Valve Control Solenoid Circuit High (Bank 1)OVERVIEW
What Does The P0080 Code Mean?
On vehicles equipped with variable valve timing (VVT), the Engine Control Module / Powertrain Control Module (ECM/PCM) controls the camshaft position by regulating the engine oil through the control solenoid to change the position of the camshaft. The control solenoid is commanded using a Pulse Width Modulated signal (PWM) from the ECM/PCM. The ECM/PCM monitors this signal and if the voltage is above specification, it will set this trouble code and illuminate the Malfunction Indicator Lamp (MIL).
Bank 1 refers to the side of the engine with cylinder #1 – be sure to verify according to manufacturers specifications. The exhaust valve control solenoid is usually located on the Exhaust manifold side of the cylinder head.
What Are The Symptoms Of The P0080 Code?
Symptoms of a P0080 may include:
- Check engine light illuminated (Malfunction indicator lamp)
- Vehicle may suffer from poor acceleration and decreased fuel economy.
What Are The Potential Causes Of The P0080 Code?
Potential causes may include:
- Wire harness poor connections or disconnected
- Control solenoid open circuit
- Short to power
- Faulty ECM
How Can You Fix The P0080 Code?
Step 1: Check wire harness
Check for unplugged harness connections, look for corrosion or loose wires to connectors. Unplug harness connectors from Solenoid and PCM, using a wiring diagram locate the + and – wires to the solenoid. The solenoid can be ground side or power side controlled, depending on the application. Check with factory wiring diagrams to determine the power flow in the circuit. Using a digital volt ohm meter (DVOM) set to the ohms setting, check for resistance between each end of the wire. An over limit reading on the DVOM may be an open in the wiring, loose connection or terminal.
Step 2: Check control solenoid
With the electrical harness to the solenoid unplugged, using the DVOM set to ohms, check for resistance between each of the electrical terminals on the control solenoid itself. Use the factory specifications or a known good control solenoid if available to determine if there is resistance in the solenoid. If there is an over limit or very low resistance reading on the DVOM, the solenoid is likely faulty.
Step 3: Locate short to power
Unplug the harness to the PCM/ECM and locate the wires to the control solenoid. With the DVOM set to the volts scale, connect the negative lead to ground and the positive lead to the wire(s) to the control solenoid. Check for voltage, if there voltage present there may be a short to power in the wiring harness. Locate the short to power by unplugging harness connectors and testing the wiring back to the solenoid.
Step 4: Inspect PCM/ECM
If all wiring and the control solenoid checks out okay, it will be necessary to monitor the solenoid during engine operation by back probing the wires at the PCM/ECM. Using an advanced scan tool that will read the engine functions, monitor the duty cycle commanded to the control solenoid. It will be necessary to monitor the solenoid during engine operation under various engine RPM’s and load. Using an oscilloscope or graphing multimeter set to the duty cycle scale, connect the negative lead to a known good ground and the positive lead to either wire terminal at the solenoid itself. The reading on the multimeter tool should match the commanded duty cycle on the scan tool. If they are opposite, the polarity may be reversed – connect the positive lead on the other wire terminal to the solenoid and re-test to verify. If the signal detected from the PCM is constantly on, there may be a fault with the PCM itself.
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