(M) Malfunction Indicator Lamp (MIL) illuminated during engine operation if this DTC was
recorded (depending if required by CARB and/or EPA). MIL is displayed as an engine icon on
instrument panel.
(G) Generator lamp illuminated
P0404 EGR Position Sensor Rationality EGR position sensor signal does not correlate to EGR
duty cycle.
P0405 EGR Position Sensor Volts Too Low EGR position sensor input below the acceptable voltage
range.
P0406 EGR Position Sensor Volts Too High EGR position sensor input above the acceptable voltage
range.
P0412 Secondary Air Solenoid Circuit An open or shorted condition detected in the secondary
air (air switching/aspirator) solenoid control circuit.
P0420 (M) 1/1 Catalytic Converter Efficiency Catalyst 1/1 efficiency below required level.
P0432 (M) 1/2 Catalytic Converter Efficiency Catalyst 2/1 efficiency below required level.
P0441 (M) Evap Purge Flow Monitor Insufficient or excessive vapor flow detected during
evaporative emission system operation.
P0442 (M) Evap Leak Monitor Medium Leak
Detected
A small leak has been detected in the evaporative
system.
P0443 (M) Evap Purge Solenoid Circuit An open or shorted condition detected in the EVAP purge
solenoid control circuit.
P0455 (M) Evap Leak Monitor Large Leak
Detected
A large leak has been detected in the evaporative system.
P0456 (M) Evap Leak Monitor Small Leak
Detected
Leak has been detected in the evaporative system.
P0460 Fuel Level Unit No Change Over
Miles
During low fuel
P0460 Fuel Level Unit No Change Over
Miles
Fuel level sending unit voltage does not change for more
than 40 miles.
P0462 Fuel Level Sending Unit Volts Too
Low
Fuel level sensor input below acceptable voltage.
P0462 (M) Fuel Level Sending Unit Volts Too
Low
Open circuit between PCM and fuel gauge sending unit.
P0463 Fuel Level Sending Unit Volts Too
High
Fuel level sensor input above acceptable voltage.
P0463 (M) Fuel Level Sending Unit Volts Too
High
Circuit shorted to voltage between PCM and fuel gauge
sending unit.
P0500 (M) No Vehicle Speed Sensor Signal No vehicle speed sensor signal detected during road load
conditions.
P0500 (M) No Vehicle Speed Sensor Signal A vehicle speed signal was not detected.
P0505 (M) Idle Air Control Motor Circuits SBEC II
P0522 Check
Gauges Light
Oil Pressure Voltage Too Low Oil pressure sending unit (sensor) voltage input below the
minimum acceptable voltage.
P0523 Check
Gauges Light
Oil Pressure Voltage Too High Oil pressure sending unit (sensor) voltage input above the
maximum acceptable voltage.
P0524 Check
Gauges Light
Oil Pressure Too Low Engine oil pressure is low. Engine power derated.
25 - 8 EMISSION CONTROL SYSTEMS DN
DESCRIPTION AND OPERATION (Continued)
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