P0080
Exhaust Valve Control Solenoid Circuit High (Bank 1)P0080 is a generic OBD-II powertrain diagnostic trouble code: Exhaust Valve Control Solenoid Circuit High (Bank 1). It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P0080 means
P0080 is stored when the PCM detects that the voltage signal in the exhaust valve control solenoid circuit on Bank 1 has risen above the expected operating range. This solenoid is a core component of the variable valve timing (VVT) or variable valve lift system fitted to modern engines. The PCM uses a pulse-width-modulated (PWM) electrical signal to energise the solenoid, which controls oil flow to the exhaust camshaft phaser or actuator. By advancing or retarding exhaust valve timing, the system optimises power output, fuel economy, and emissions across different operating conditions. A "circuit high" fault means the PCM is sensing excessive voltage on the solenoid control line — this can occur because the solenoid winding has developed a high-resistance open circuit, because the control wire has shorted to a power supply, or because the solenoid itself has failed internally. When this code is active, the PCM typically disables VVT and reverts exhaust timing to a fixed default position, which noticeably reduces performance and fuel efficiency. Prompt diagnosis is recommended because prolonged operation with VVT disabled can mask related oil or mechanical issues that, if left unaddressed, may cause engine damage.
Common causes
Most-frequently reported root causes when P0080 is logged.
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1
Faulty or burned-out exhaust valve control solenoid (internal open circuit)
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2
Solenoid control wiring shorted to battery voltage
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3
Broken or disconnected solenoid connector causing loss of ground return path
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4
High resistance or open circuit in the solenoid ground path
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5
Critically low engine oil level preventing solenoid-actuated oil flow to the camshaft phaser
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6
Sludge or oil contamination blocking the solenoid oil control valve passages
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7
PCM driver circuit fault generating incorrect voltage on the solenoid output
Symptoms drivers notice
How to diagnose P0080
A typical diagnostic flow when this code is present.
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1
Retrieve all codes and freeze-frame data with a scan tool; check for companion VVT codes (P0010–P0015 range) that may clarify which component is at fault
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2
Verify engine oil level and condition — low or heavily contaminated oil is a primary cause of VVT solenoid and phaser faults; correct before further diagnosis
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3
Inspect the exhaust valve control solenoid connector and wiring for signs of heat damage, corrosion, or a shorted wire contacting a battery-positive circuit
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4
Disconnect the solenoid connector and measure solenoid resistance with a multimeter; compare to manufacturer specification (typically 6–20 ohms) — an open reading or excessively high resistance confirms solenoid failure
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5
Check for voltage at the solenoid connector with the ignition on; unexpected battery voltage on the control wire without PCM activation indicates a short to power
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6
Use a scan tool with bi-directional controls to command the solenoid on and off while monitoring circuit voltage and solenoid response
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7
Replace the solenoid if electrical tests confirm failure; clear codes and verify VVT system operation before returning the vehicle to service
Related powertrain codes
Frequently asked questions
Will P0080 put my car in limp mode?
It depends on the vehicle. Many manufacturers have the PCM disable VVT and revert to fixed exhaust valve timing rather than imposing full limp mode, so the car remains driveable but with reduced performance. Some vehicles with more aggressive failsafe programming do restrict engine speed or power output. Check your freeze-frame data for any RPM or torque limiters being active.
Can low oil level really cause P0080?
Yes. The VVT system is hydraulically actuated using engine oil. If oil level is low, oil pressure can drop below the threshold needed to operate the camshaft phaser, causing the solenoid circuit to behave erratically or register an out-of-range voltage as the PCM keeps commanding the solenoid with no mechanical response. Always check oil level first before replacing the solenoid.
How do I tell the difference between a solenoid fault and a camshaft phaser fault?
P0080 specifically targets the solenoid circuit (electrical). Camshaft phaser mechanical faults typically set performance or range codes like P0011 or P0012 alongside or instead of circuit codes. Confirming solenoid resistance and wiring integrity before condemning the phaser saves unnecessary expense, as phasers are significantly more costly to replace.
Is P0080 a serious code that requires immediate repair?
It should be addressed promptly. While the engine will continue to run, driving with VVT disabled increases fuel consumption, reduces power, and if the root cause is oil-related (low level or sludge), continued operation risks camshaft phaser wear or seizure, which is a far more expensive repair than the solenoid itself.
Disabling P0080 in software
RaceTune can permanently disable P0080 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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