Buick Regal 1997-2000

3.8L V6 VIN K Auto 4

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Trouble Code: P1362



Ignition Bypass Circuit Low Voltage

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: P1374



IC Module 3X Reference Circuit Malfunction

Possible Causes:



IC 3X signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI interference
 
IC 3X signal circuit is open, shorted to ground or shorted to B+
 
IC module is damaged or has failed
 
PCM has failed
 
TSB 99-06-04
 

Trouble Code: P1380



Misfire Detected, Rough Road Data Unusable

Possible Causes:



The presence of this code (P1380) indicates the ABS/TCS system detected a malfunction that would not allow the EBTCM to transmit the correct rough road data to the PCM
 
Refer to Diagnostic System Check for Antilock Brake System
 
Refer to Diagnostic System
 

Trouble Code: P1381



Misfire Detected - No Communication With The EBCM

Possible Causes:



Service the ABS before diagnosing a misfire because an actual engine misfire may or may not exist. Also, an actual engine misfire may have occurred during a period of ABS malfunction.
 
Determine if the vehicle was driven on a rough road, and the ABS could
 

Trouble Code: P1404



EGR Valve Closed Position Signal Range/Performance

Possible Causes:



EGR sensor signal circuit is shorted to VREF
 
EGR sensor ground circuit is open or has high resistance
 
EGR sensor is damaged or has failed (sensor/solenoid unit)
 
EGR valve pintle or valve seat contains carbon deposits
 
PCM has failed
 

Trouble Code: P1406



EGR Valve Pintle Position Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open, shorted to ground or to B+
 
EGR solenoid power circuit is open (check the IGNFD 5A fuse)
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1441



EVAP System Flow During Non-Purge

Possible Causes:



EVAP purge valve, purge pipe, or the charcoal canister has a temporary blockage (this fault could cause an intermittent fault)
 
FTP sensor is out-of-calibration, damaged or it is skewed
 
EVAP purge solenoid valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P1546



A/C Clutch Feedback Circuit Low Input

Possible Causes:



A/C clutch status line is open or shorted to ground
 
A/C clutch relay is damaged or has failed (contains not closing)
 
A/C clutch relay power circuit is open (test the HVAC fuse)
 
PCM has failed
 

Trouble Code: P1554



Cruise Control Feedback Circuit

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: P1571



Traction Control Torque Request Circuit Malfunction

Possible Causes:



T/C desired torque circuit is open or shorted to ground
 
T/C desired torque circuit is shorted to system power (B+)
 
EBTCM has failed
 
PCM has failed
 

Trouble Code: P1585



Cruise Control Inhibit Output Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is shorted to system voltage
 
Cruise control module power circuit is open (test CR CNT fuse)
 
Cruise control stepper motor power circuit is shorted to ground
 
Cruise control module is damaged or has failed
 
PCM has failed
 

Trouble Code: P1602



Loss Of EBTCM Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the PCM
 
Perform the EBTCM Diagnostic Circuit Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1604



Loss Of HVAC Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the HVAC
 
Perform the ECC System Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1605



Lost Communications with HVAC Control System

Possible Causes:

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:



Intermittent short circuit on the serial data circuit. Refer to Data Link Connector (DLC) Sy
 

Trouble Code: P1610



Loss of Standard Body Module Serial Data

Possible Causes:



Check the serial data circuit for a poor connection at the BCM
 
Perform the BCM System Check
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1626



Theft Deterrent System Fuel Enable Circuit Malfunction

Possible Causes:



Perform the Onboard Diagnostic System Check
 
If the PCM needs replacing, it must be reprogrammed
 
TSB 02-08-56-002 contains a repair procedure for this code
 

Trouble Code: P1629



Theft Deterrent Signal Not Present, Engine Cranking

Possible Causes:



Perform the Onboard Diagnostic System Check
 
Refer to the diagnostics for the Theft Deterrent System
 
If the PCM needs replacing, it must be reprogrammed
 
TSB 02-08-56-002 contains a repair procedure for this code
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



Perform the Onboard Diagnostic System Check
 
Refer to the diagnostics for the Theft Deterrent System
 
If the PCM needs replacing, it must be reprogrammed
 

Trouble Code: P1631



Theft Deterrent Enable Signal Not Correct

Possible Causes:



This code indicates that the VTD password that the PCM has learned does not agree with the password being received from the theft deterrent system. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the T
 

Trouble Code: P1635



5-Volt Reference 'A' Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to sensor ground or chassis ground
 
5v VREF circuit, MAP or FTP sensor circuit is shorted to (B+)
 
5v VREF circuit shorted to EGR sensor High signal circuit
 
EGR solenoid valve (and sensor) is damaged or has failed
 
PCM has fail
 

Trouble Code: P1639



5-Volt Reference 'B' Circuit Malfunction

Possible Causes:



A/C refrigerant pressure sensor VREF circuit is open, shorted to ground or shorted to system power
 
A/C refrigerant pressure sensor is damaged or PCM has failed
 
TSB 61-65-61 contains a repair procedure for this code
 

Trouble Code: P1640



MIL Control Circuit Malfunction

Possible Causes:



MIL control circuit is open, shorted to ground or to power (B+)
 
MIL (lamp) is damaged or failed (open circuit or missing)
 
MIL power circuit is open (check Fuse 39 in U/H fuse block)
 
PCM has failed
 

Trouble Code: P1641



A/C Fan Relay Control Circuit Malfunction

Possible Causes:



A/C relay circuit is open, shorted to ground or to power (B+)
 
A/C relay is damaged or failed (open circuit or missing)
 
A/C relay power circuit is open (test the A/C BFC fuse)
 
PCM has failed
 

Trouble Code: P1643



Fuel Pump PWM Control Circuit Malfunction

Possible Causes:



F/P PWM signal circuit is open, shorted to ground or to B+
 
Fuel pump control module is damaged or has failed
 
PCM has failed
 

Trouble Code: P1645



Supercharger Boost Solenoid Control Control Circuit

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: P1646



Boost Control Solenoid Circuit Malfunctions

Possible Causes:



Boost control solenoid circuit is open or shorted to ground
 
Boost control solenoid circuit is shorted to power
 
Boost control solenoid power circuit is open (test AC CLU fuse)
 
Boost control solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1651



Fan 1 Control Relay Control Circuit Malfunction

Possible Causes:



Cooling fan relay 1 control circuit is open or shorted to ground
 
Cooling fan relay 1 control circuit is shorted to system power
 
Cooling fan relay 1 power circuit is open (test COOL FAN1 fuse or the MAXI fuse)
 
Cooling fan relay 1 is damaged or has faile
 

Trouble Code: P1652



Cooling Fan Relay 2 Control Circuit

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: P1653



TCS Torque Control Circuit Malfunction

Possible Causes:



Torque control circuit is open, shorted to ground or to B+
 
EBTCM has failed
 
PCM has failed
 

Trouble Code: P1654



A/C Relay Control Circuit Malfunction

Possible Causes:



A/C relay control circuit is open, shorted to ground or to B+
 
A/C relay power circuit is open (check the HVAC RLY fuse)
 
A/C relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1655



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



EVAP solenoid control circuit is open, shorted to ground or shorted to power (B+)
 
EVAP solenoid power circuit is open (check MISC ENG fuse)
 
EVAP solenoid is damaged or has failed
 
PCM has failed
 
TSB 61-65-41 contains a repair procedure for this code
 

Trouble Code: P1662



Cruise Control Inhibit Control Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is open, shorted to ground or to B+
 
Cruise control module has failed
 
PCM has failed
 

Trouble Code: P1665



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open, shorted to ground or to system power
 
Vent solenoid power circuit is open (test the ENG EMISS fuse)
 
EVAP vent solenoid is damaged or has failed
 
PCM has failed
 
TSB 71-65-66 contains a repair procedure for this code
 

Trouble Code: P1667



Fuel Pump Speed Relay Control Circuit

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: P1671



MIL Control Circuit Malfunction

Possible Causes:



MIL control circuit is open, shorted to ground or to power (B+)
 
MIL power circuit is open (check the CLUSTER fuse)
 
MIL (bulb) is open or missing
 
PCM has failed
 

Trouble Code: P1675



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open, shorted to ground or shorted to power (B+)
 
Vent solenoid power circuit is open (check the IGN1 fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1676



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

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.
 
 

Trouble Code: P1689



Traction Control Delivered Torque Output Circuit

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: P1810



Transmission Pressure Switch Manifold Circuit Malfunction

Possible Causes:



TFP valve position switch signal circuit is open or grounded
 
TFP valve position switch circuit shorted to another signal
 
TFP valve position switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P1811



Maximum Adapt and Long Shift

Possible Causes:



Inspect for possible vehicle overloading, exceeding trailer towing limit, or towing in overdrive.
 
If you performed a transmission overhaul, use the scan tool to clear all adapts.
 

 
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