Buick Regal 1997-2000

3.8L V6 VIN K Auto 2

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Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only Cylinder 5
 
Fuel delivery component fault that affects only Cylinder 5 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system pr
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only Cylinder 6
 
Fuel delivery component fault that affects only Cylinder 6 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system pr
 

Trouble Code: P0325



Knock Sensor Circuit Malfunction (Bank 1)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (i.e., not mounted properly)
 
Knock sensor is damaged or has failed
 
On modules with an integrated sensor, clear the codes and retest for codes. If the sa
 

Trouble Code: P0326



Knock Sensor Noise Channel High Input

Possible Causes:



Knock sensor circuit is open between the sensor and the PCM
 
Knock sensor signal wire is routed to close to the spark plug wires or any other possible cause of EMI/RFI under the hood
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0327



Knock Sensor Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (check for proper torque)
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0332



Knock Sensor Circuit Malfunction (Bank 2)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (i.e., not mounted properly)
 
Knock sensor is damaged or has failed
 
On modules with an integrated sensor, clear the codes and retest for codes. If the sa
 

Trouble Code: P0336



Crankshaft Reference 18X Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor VREF circuit is open, or the ground (Low Reference) circuit is open
 
CKP sensor is damaged or it failed (check the crankshaft reluctor)
 
CKP sensor wiring routed close to spark plug wires
 

Trouble Code: P0341



CMP Sensor Signal Range/Performance

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or VREF
 
CMP sensor is cracked or damaged (check the reluctor wheel)
 
PCM has failed
 
TSB 02-06-04-008 contains a repair procedure for this code
 

Trouble Code: P0401



Insufficient EGR Flow Detected

Possible Causes:



Base engine problem (e.g., a severely restricted exhaust)
 
EGR vacuum hoses damaged, loose or routed incorrectly
 
EGR passages or intake passages clogged or restricted
 
EGR solenoid valve is clogged (carbon), damaged or has failed
 
TSB 87-65-22 contains a
 

Trouble Code: P0403



EGR Solenoid Control Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open or shorted to ground
 
EGR solenoid control circuit is shorted to system power (B+)
 
EGR solenoid high control (VREF) circuit is open
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0404



EGR Open Position Signal Range/Performance

Possible Causes:



EGR sensor signal circuit is open, shorted to ground or power
 
EGR sensor ground or VREF circuit is open
 
EGR valve seat or pintle contains debris or plugged with carbon
 
PCM has failed
 

Trouble Code: P0405



EGR Position Sensor Circuit Low Input

Possible Causes:



EGR position sensor signal circuit is open
 
EGR position sensor signal circuit is shorted to ground
 
EGR position sensor VREF circuit is open or shorted to ground
 
EGR position sensor is damaged or has failed
 
PCM has failed
 
TSB 99-06-04-45 contains a re
 

Trouble Code: P0410



Secondary AIR System Performance

Possible Causes:



AIR solenoid power circuit is open (check the U/H IGN fuse)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
AIR system hoses or lines are damaged, pinched or kinked
 
Base engine
 

Trouble Code: P0412



Secondary Air System Solenoid Circuit Malfunction

Possible Causes:



AIR solenoid control circuit is open, shorted to ground or B+
 
AIR solenoid power circuit is open (test power from IGN1 fuse)
 
AIR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0418



Secondary Air System Pump Relay Control Circuit Malfunction (Bank 1)

Possible Causes:



AIR relay control circuit is open, shorted to ground or power
 
AIR relay control circuit is shorted to system power (B+)
 
AIR relay power circuit is open (test power from IGN fuse)
 
AIR relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0420



Catalyst System Bank 1 Low Efficiency

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Base engine problems (i.e., high engine oil or coolant usage)
 
Catalytic converter is damaged, contaminated or has failed
 
Continuous engine misfire conditions, or weak or low coil output
 
Front H
 

Trouble Code: P0440



EVAP System No Flow During Purge

Possible Causes:



Charcoal canister is loaded with fuel or moisture
 
Fuel filler cap is loose, cross-threaded, damaged or wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank pressure sensor is damaged, disconnected or it failed
 
Fuel
 

Trouble Code: P0441



Evaporative Emission (EVAP) System No Flow During Purge

Possible Causes:

Check for the following conditions:



Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
 
Damaged harness. Insp
 

Trouble Code: P0442



EVAP System Small Leak (0.040") Detected

Possible Causes:



Charcoal canister is loaded with fuel or moisture
 
Fuel filler cap is loose, cross-threaded, damaged or wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank pressure sensor is damaged, disconnected or it failed
 
Fuel
 

Trouble Code: P0443



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



Purge solenoid control circuit is open or shorted to ground
 
Purge solenoid control circuit is shorted to system power (B+)
 
Purge solenoid power circuit is open (test the IGN1 fuse)
 
Purge solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0446



EVAP Canister Purge Vent Blocked

Possible Causes:



EVAP vent fresh air hose is clogged, kinked or restricted
 
EVAP Vent solenoid is contaminated, damaged or has failed
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
PCM has failed
 

Trouble Code: P0449



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open or shorted to ground
 
Vent solenoid control circuit is shorted to system power (B+)
 
Vent solenoid power circuit is open (test the VENT SOL fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0452



Fuel Tank Pressure Sensor Circuit Low Input

Possible Causes:



FTP sensor signal circuit is open or shorted to ground
 
FTP sensor VREF circuit is open or shorted to ground
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0453



Fuel Tank Pressure Sensor Circuit High Input

Possible Causes:



FTP sensor signal circuit is shorted to VREF or system power
 
FTP sensor ground circuit is open between sensor and PCM
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0462



Fuel Level Sensor Low Input

Possible Causes:



Fuel level sensor signal circuit is shorted to ground between the fuel level sensor and the PCM connector
 
Fuel level sender is damaged, binding or not aligned properly
 
Instrument cluster or the PCM has failed
 

Trouble Code: P0463



Fuel Level Sensor High Input

Possible Causes:



Fuel level sensor signal circuit is shorted to system power
 
Fuel level sensor ground circuit is open
 
Fuel level sender is damaged, binding or not aligned properly
 
PCM has failed
 

Trouble Code: P0480



Cooling Fan Relay 1 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 1 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0481



Cooling Fan Relay 2 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 2 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0502



VSS Circuit Low Input (4T40-E, 4T45-E, 4T65-E)

Possible Causes:



Output shaft rotor is chipped or damaged
 
OSS tip contains debris or metal shavings (an intermittent fault)
 
OSS positive (+) signal circuit is open or shorted to ground
 
OSS negative (-) signal circuit is open or shorted to ground
 
OSS is damaged or has
 

Trouble Code: P0503



VSS Circuit Malfunction (4T40-E, 4T45-E, 4T65-E, 4L80-E)

Possible Causes:



OSS assembly connector is damaged, loose or shorted
 
Output shaft rotor is chipped or damaged (intermittent fault)
 
OSS tip contains debris or metal shavings (an intermittent fault)
 
OSS (+) signal circuit is open or shorted to ground (intermittent)
 
OSS
 

Trouble Code: P0506



Idle Speed Too Low

Possible Causes:



Air inlet duct is collapsed, loose or air filter element is clogged
 
Base engine problem (i.e., compression or misfire condition)
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
IAC solenoid control circuit has a high resistance con
 

Trouble Code: P0507



Idle Speed Too High

Possible Causes:



Engine vacuum leaks, PCM valve is leaking or the wrong valve
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
IAC valve is damaged or has failed
 
MAF sensor is dirty, "skewed" or installed improperly
 
Throttle plate, throttle shaft o
 

Trouble Code: P0530



Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit

Possible Causes:

Check for the following conditions:



Important:: Be sure to inspect PCM engine grounds for being secure and clean. Poor connection at PCM. Inspect harness connectors for the following items:

Backed out terminals
 
Improper mating
 
Broken lo
 

 

Trouble Code: P0560



System Voltage

Possible Causes:

Check for the following conditions:



Important:: Be sure to inspect PCM engine grounds for being secure and clean. Poor connection at PCM. Inspect harness connectors for the following items:

Backed out terminals
 
Improper mating
 
Broken lo
 

 

Trouble Code: P0601



Control Module ROM Malfunction

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 
TSB 67-65-23 contains a repair procedure for this code
 

Trouble Code: P0602



Control Module Not Programmed

Possible Causes:



Reprogram the PCM with the correct software and calibration. If this step does not correct the problem, the PCM must be replaced and programmed with the correct software/calibration.
 

Trouble Code: P0603



Control Module Long Term Memory Reset

Possible Causes:



An interruption to the PCM main power and/or ground circuits
 
Check the PCM power and ground circuits and make repairs as necessary. Clear the codes and recheck. If it resets, the PCM must be replaced and programmed with the correct software.
 

Trouble Code: P0604



Control Module Random Access Memory Failure

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0606



Control Module Internal Performance

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0620



Generator Signal Range/Performance

Possible Causes:



Generator 'L' terminal circuit is open, shorted to ground or B+
 
Generator 'F' terminal circuit is open, shorted to ground or B+
 
PCM has failed
 

 
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