Alero, Grand Am 1999-2005

2.4L L4 VIN T Auto 2

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Trouble Code: P0560



System Voltage Malfunction

Possible Causes:



Check for high resistance at battery connections or at the U/H Fuse Block power circuit
 
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: P0562



System Voltage Too Low

Possible Causes:



Check for high resistance at the battery connections or at the PCM IGN or PCM BAT fuse 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: P0563



System Voltage Too High

Possible Causes:



Check the condition of the battery (it may be worn out)
 
Test the operation of the Generator (it may be overcharging)
 
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: P0705



Transaxle Range Switch (PRNDL) Circuit Malfunction

Possible Causes:



TR switch circuit(s) is open or shorted to ground
 
TR switch circuit(s) is shorted to system power (B+)
 
TR switch is damaged or out of adjustment
 
PCM has failed
 
TSB 71-65-37 contains a repair procedure for this code
 

Trouble Code: P0711



TFT Sensor Range/Performance (4T40-E/4T45-E)

Possible Causes:



ATF fluid level too low or the fluid is contaminated or burnt
 
TFT sensor is contaminated, damaged or "skewed"
 
PCM has failed
 

Trouble Code: P0712



TFT Sensor Circuit Low Input (4T40-E/4T45-E)

Possible Causes:



TFT sensor signal circuit is shorted to sensor or chassis ground
 
TFT sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0713



TFT Sensor Circuit High Input (4T40-E/4T45-E)

Possible Causes:



TFT sensor connector is damaged, loose or open
 
TFT sensor signal circuit is open between the sensor and PCM
 
TFT sensor signal circuit is shorted to VREF or system power
 
TFT sensor is damaged or has failed (it may be open)
 
PCM has failed
 

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: P0719



TCC Brake Switch Circuit Low Input (3T40, 4T40/4T45-E)

Possible Causes:



TCC brake switch circuit is open or shorted to ground
 
TCC brake switch power circuit is open (test ABS or ERL fuse)
 
TCC brake switch is out of adjustment or damaged
 
PCM has failed
 

Trouble Code: P0724



Brake Switch Circuit High Input (3T40, 4T40-E, 4T45-E)

Possible Causes:



Check for ABS trouble codes (they can cause this code to set)
 
TCC brake switch circuit is shorted to system power
 
TCC brake switch is out of adjustment or damaged
 

Trouble Code: P0742



TCC System Stuck On - Mechanical (4T40-E, 4T45-E)

Possible Causes:



Transmission seal(s) leaking or damaged
 
TCC release switch contains debris or sediment
 
TCC release switch contacts are damaged or switch has failed
 
TCC release switch circuit is shorted to ground
 

Trouble Code: P0748



Pressure Control Solenoid Circuit Malfunction (4T40-E, 4T45-E)

Possible Causes:



PC solenoid high side circuit is open, shorted to ground or B+
 
PC solenoid low side circuit is open, shorted to ground or to B+
 
PC solenoid high or low side driver is damaged or has failed
 

Trouble Code: P0751



A/T 1-2 Shift Solenoid - No 1st or 4th Gear (4T40-E/4T45-E)

Possible Causes:



ATF is burnt or contaminated, or the level is incorrect
 
Transmission has an internal damage to the torque converter
 
Shift solenoid valve seals are damaged or leaking
 
Transmission has failed
 

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: P0756



A/T 2-3 Shift Solenoid - No 2nd Or 3rd Gear (4T40-E/4T45-E)

Possible Causes:



ATF is burnt or contaminated
 
Transmission has plugged or restricted fluid circuits
 
Shift solenoid valve seals are leaking or damaged
 
Transmission has failed
 

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: P1133



HO2S-11 (Bank 1 Sensor 1) Insufficient Switching

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
Fuel pressure is too high (i.e., causing a rich air fuel mixture)
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal high or low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

Trouble Code: P1137



HO2S-12 Low Voltage During Power Enrichment

Possible Causes:



Air leaks present in exhaust manifold, exhaust pipes, or in the HO2S mounting location
 
HO2S may be contaminated (due to improper fuel or silicone)
 
PCM has failed
 

Trouble Code: P1171



Fuel System Lean During Acceleration

Possible Causes:



Fuel filter clogged or restricted
 
Fuel injectors dirty or restricted
 
Fuel level too low during heavy acceleration events
 
Fuel pressure regulator has failed (not supplying enough fuel)
 
Water or alcohol in fuel (low HO2S signal during acceleration)
 

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: P1380



EBTCM DTC Detected, Rough Road Data Unusable

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 an ABS malfunction.
 
Determine if the vehicle was driven on a rough road, and the ABS could not detect this due to a malfunction. The PCM may interpret variations in crankshaft speed caused by the rough road as a misfire without an actual engine misfire present.
 
If U1016 is set, check for a fault in the IPC serial data line, its connections or in the IPC assembly or controller.
 

Trouble Code: P1381



Misfire Detected - No Communication With The EBCM

Possible Causes:



When this code is set, this indicates that a misfire was detected and that the PCM could not determine if the detected misfire was true or due to operating the vehicle on a rough surface. A misfire can be a true misfire with or without setting this code.
 
Check the IPC and EBCM for poor electrical connections at the UART serial data terminals. Verify that no true misfire exists after repairing the cause of this trouble code. If DTC U1016 is also set, this indicates that the malfunction may lie within the IPC serial data line, its electrical connections, or within the IPC.
 

Trouble Code: P1441



EVAP System Flow During Non-Purge

Possible Causes:



An improperly installed or damaged EVAP canister purge valve
 
A temporary blockage in the EVAP canister purge valve, purge pipe, or EVAP canister could cause an intermittent condition
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
Purge solenoid valve is damaged or has failed
 
PCM has failed
 
TSB 02-06-04-046 contains a repair procedure for this code
 

Trouble Code: P1621



Control Module Long Term Memory Performance

Possible Causes:



Perform the OBD System Check for Engine Controls
 
The PCM needs to be replaced
 

Trouble Code: P1626



Theft Deterrent Fuel Enable Signal Lost

Possible Causes:



The most likely cause of this code is lost communications
 
If the engine starts and stalls, refer to VTD system diagnosis
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1629



Theft Deterrent Fuel Enable Signal Not Received

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: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



Refer to Programming the Theft Deterrent System
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1631



Theft Deterrent Fuel Enable Signal Not Correct

Possible Causes:



Refer to Diagnostic System Check for Body Control Systems
 
Perform the Powertrain Onboard Diagnostic System Check
 

Trouble Code: P1632



Theft Deterrent Fuel Disable Signal Received

Possible Causes:



Perform the Powertrain Onboard Diagnostic System Check
 
Password Learn Procedure - Attempt to start the vehicle (leave the ignition "on"). The Theft System telltale will flash for 4 seconds and then remain "on" for 10 minutes. Theft System Learn Mode will display Disabled on the Scan Tool
 
Turn the ignition "off" after the Theft System telltale goes "out".
 
Repeat steps 1 and 2 two more times. After the Theft System telltale turns "off" on the 3rd key cycle, and Theft System Learn Mode will display Enabled on the Scan Tool, attempt to start the engine. Once the engine starts the password is learned.
 

Trouble Code: P1860



TCC PWM Solenoid Electrical (4T40/4T45-E)

Possible Causes:



TCC solenoid control circuit is open, shorted to ground or shorted to system power (B+)
 
TCC solenoid power circuit is open (check the TRANS fuse)
 
TCC solenoid is damaged or has failed
 
PCM has failed
 
TSB 02-07-30-022A contains a repair procedure for this code
 

Trouble Code: P1870



Transaxle Component Slipping (3T40)

Possible Causes:



Check the ATF level and condition (look for burnt fluid)
 
Transmission may have internal damage (a mechanical fault)
 

Trouble Code: P1887



TCC Release Switch Circuit Malfunction (4T40/4T45-E)

Possible Causes:



TCC release switch signal circuit is open or the PCM has failed
 
Turbine shaft O-ring seal leaks, oil seal rings missing/damaged.
 
TCC control valve damaged or No. 1 check ball is damaged
 
Spacer plate release exhaust blocked with debris
 
Case cover or spacer plate gaskets improperly installed
 
TSB 02-07-30-022A contains a repair procedure for this code
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
SDM (module) could be shorted pulling the voltage low
 

Trouble Code: U1016



No Communication With Powertrain Control Module

Possible Causes:



PCM Class 2 circuit is open, shorted to ground or to B+
 
PCM ignition power circuit(s) has a high resistance condition
 
PCM main ground circuit(s) has a high resistance condition
 
PCM (module) may have failed and is pulling the circuit low
 

 
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