Alero, Grand Am 1999-2005

3.4L V6 VIN E Auto 2

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Trouble Code: P0325



Knock Sensor Circuit Malfunction

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 same code resets, the 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: P0336



Crankshaft Reference 24X Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor ground (Low Reference) circuit is open
 
CKP sensor is damaged or it failed (check crankshaft reluctor)
 
PCM has failed
 

Trouble Code: P0341



CMP Sensor Signal Range/Performance

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or shorted to VREF between the sensor and the PCM (intermittent fault)
 
CMP sensor signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI
 
CMP sensor is cracked, damaged or has failed
 
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), or any other problem that causes the engine to run poorly
 
EGR passages or intake passages clogged or restricted
 
EGR pipe is clogged, dirty or otherwise restricted
 
EGR vacuum hoses damaged, loose or routed incorrectly
 
EGR solenoid valve is clogged (carbon), damaged or has failed
 
MAP sensor is dirty, damaged or it is "skewed"
 

Trouble Code: P0403



EGR Solenoid Control Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open, shorted to ground or B+
 
EGR solenoid high control (VREF) circuit is open
 
EGR solenoid is damaged or has failed
 
PCM has failed
 
TSB 02-06-04-053 contains a repair procedure for this code
 

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 contains debris or carbon (inspect and clean)
 
EGR valve pintle contains debris or carbon (inspect and clean)
 
EGR valve is contaminated, clogged, damaged or has failed
 
PCM has failed
 

Trouble Code: P0405



EGR Sensor Circuit Low Input

Possible Causes:



EGR position sensor signal circuit is open or 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
 

Trouble Code: P0420



Catalyst System Low Efficiency (Bank 1)

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 HO2S or rear HO2S is contaminated with fuel or moisture
 
Rear HO2S is loose in the mounting hole (check it for a leak)
 
Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)
 

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 condition
 
IAC valve is damaged or has failed
 
MAF sensor is dirty, out-of-calibration or it is "skewed"
 
Throttle plate, throttle shaft or linkage is damaged or sticking
 
PCM has failed
 

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 or linkage is damaged or sticking
 
PCM has failed
 

Trouble Code: P0530



A/C Refrigerant Pressure Sensor Circuit Malfunction

Possible Causes:



ACP sensor signal circuit is open or shorted to ground
 
ACP sensor signal circuit is shorted to VREF or system power
 
ACP sensor ground circuit is open
 
ACP sensor is damaged or has failed
 
PCM has failed
 
TSB 61-65-61 contains a repair procedure for this code
 

Trouble Code: P0560



System Voltage Malfunction

Possible Causes:



Check for high resistance at the battery connections or at the Underhood Fuse Block power circuit connection to the PCM
 
Check the drive belt for excessive wear and the proper tension
 
Check the condition of the battery and the Generator output
 
Vehicle may have been used to jump-start another vehicle
 

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: P0607



Control Module 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: P0716



A/T Input Speed Sensor Circuit Malfunction (4T40/4T45-E)

Possible Causes:



ISS positive (+) circuit is open, shorted to ground or to power
 
ISS negative (-) circuit is open, shorted to ground or to power
 
ISS is damaged or has failed
 
PCM has failed
 
TSB 02-07-30-022A contains a repair procedure for this code
 

Trouble Code: P0753



A/T 1-2 Shift Solenoid Circuit Malfunction (4T40-3/4T45-E)

Possible Causes:



1-2 shift solenoid control circuit is open or shorted to ground
 
1-2 shift solenoid control circuit is shorted to system power
 
1-2 shift solenoid is damaged or has failed
 
PCM has failed
 
TSB 02-07-30-022A contains a repair procedure for this code
 

Trouble Code: P0758



A/T 2-3 Shift Solenoid Circuit (4T40-E/4T45-E)

Possible Causes:



2-3 shift solenoid control circuit is open or shorted to ground
 
2-3 shift solenoid control circuit is shorted to system power
 
2-3 shift solenoid power circuit is open (check the ERLS fuse)
 
2-3 shift solenoid is damaged or has failed
 
PCM has failed
 
TSB 02-07-30-022A contains a repair procedure for this code
 

Trouble Code: P1189



Engine Oil Pressure Switch Circuit Malfunction

Possible Causes:



EOP switch circuit is open between the sensor and the PCM
 
Engine oil pressure switch is damaged (possible open circuit)
 
PCM has failed
 

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Perform the Crankshaft System variation "learn" procedure
 
If the Scan Tool indicates that DTC P1336 ran and passed, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
 

Trouble Code: P1374



CKP Sensor High To Low Resolution Frequency Correlation

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
 

Trouble Code: P1404



EGR Valve Closed Position Signal Range/Performance

Possible Causes:



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

Trouble Code: P1554



Cruise Engaged Circuit High Input

Possible Causes:



Cruise control inhibit circuit is open or shorted to ground
 
SMCC II cruise control module is damaged or has failed
 
PCM has failed
 

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 Theft Deterrent Module has been replaced and the PCM password learn function has not been enabled.
 
Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

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 failed
 

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



Output Driver 1 Input Voltage High Input

Possible Causes:



EVAP Vent control circuit open, shorted to ground or to B+
 
Fan relay 1 control circuit is open, shorted to ground or to B+
 
Fan relay 2 or 3 control circuit is open, shorted to ground or B+
 
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: P1810



TFP Valve Position Switch Assembly (4T65-E)

Possible Causes:



Inspect the transmission linkage from the gear select lever to the manual valve for proper adjustment
 
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 Adaptive & Long Term Shift (4T65-E)

Possible Causes:



Ask customer about overloading vehicle, exceeding trailer-towing limit, or towing in O/D
 
ATF level is low, or the fluid is contaminated or burnt
 
1-2 accumulator piston seals rolled or damaged
 
1-2 accumulator piston and pin missing, binding or damaged
 
Forward servo assembly damaged or misassembled
 
Oil pump assembly damaged or missing components
 
Spacer plate and gaskets damaged or misassembled
 
Driven sprocket support seals damaged or missing
 
2nd clutch piston and seal assembly binding or damaged
 
2nd clutch fiber and steel plates misassembled or damaged
 
Second clutch spring assembly damaged or misassembled
 
Forward band burned, damaged or misassembled
 
1-2 support roller clutch assembly damaged or misassembled
 

Trouble Code: P1812



Torque Converter Overstressed (4T65-E)

Possible Causes:



ATF level is low or the fluid is burnt or contaminated
 
ATF filter is clogged or not properly installed/seated
 
Vehicle used for towing or driven while overloaded
 

Trouble Code: P1819



Internal Mode Switch - No Start (4T65-E)

Possible Causes:



Inspect the transmission linkage from the range selector to the manual shift shaft for proper adjustment
 
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: P1822



Internal Mode Switch 'B' Circuit Low Input (4T65-E)

Possible Causes:



IMS Signal 'B' circuit is open or has a high resistance condition
 
Transmission has internal problems / may need an overhaul
 

 
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