Search OBD-II codes
Filter by family, system, severity, engine, fuel or manufacturer. Every row links to the full diagnostic page with causes, safety advice, checks and a guided workflow.
208 codes found
Showing 126–150 of 208
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Idle air control circuit high input
The idle air control circuit reads too high.
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Engine oil pressure sensor circuit malfunction
The oil pressure circuit has a fault — confirm with a mechanical gauge.
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Engine oil pressure sensor range / performance problem
The oil pressure signal is outside the expected range — confirm with a mechanical gauge.
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Engine oil pressure sensor low input
The oil pressure signal is low — verify real pressure before driving.
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Exhaust gas temperature sensor circuit malfunction (Bank 1)
The exhaust temperature sensor circuit has a fault.
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System voltage unstable
The system voltage is fluctuating.
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System voltage low
System voltage is below the expected range while running.
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System voltage high
System voltage is above the expected range, risking battery damage.
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Thermostat heater control circuit open
The electric thermostat heater circuit is open.
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Serial communication link malfunction
The ECM lost serial communication with another module.
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Internal control module memory checksum error
The engine computer detected an internal memory fault.
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ECM processor fault
The engine computer detected an internal processor fault.
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ECM performance
The engine computer has a performance fault.
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Generator field / alternator control circuit malfunction
The alternator excitation control circuit has a fault.
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Throttle actuator control range / performance
The electronic throttle could not reach the commanded position.
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ECM power relay control circuit malfunction
The ECM power relay circuit has a fault.
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Cooling fan relay 1 control circuit low
The cooling fan relay 1 circuit reads too low.
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Transmission control system malfunction
The transmission controller has stored a fault. Read the sub-codes to go further.
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Transmission range sensor (PRNDL) circuit malfunction
The transmission position sensor signal does not match the lever position.
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Transmission range sensor range / performance
The transmission range sensor signal does not match the lever position.
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Input shaft / turbine speed sensor circuit malfunction
The transmission cannot read input shaft speed.
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Input shaft speed sensor range / performance
The input speed signal is inconsistent with engine and output speeds.
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Input shaft speed sensor no signal
No input speed signal is received.
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Output shaft speed sensor circuit malfunction
The transmission cannot measure output speed, so shifting is compromised.
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Output shaft speed sensor no signal
No output speed signal is received.