Cavalier, Sunfire 2001-2005

2.4L L4 VIN T Std 2

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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: 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: P1201



Gas Mass Sensor Range/Performance

Possible Causes:



Air filter or air inlet duct is clogged or restricted
 
Air leaks in the exhaust pipes or manifold, or the HO2S location
 
Base engine problem (i.e., engine compression, vacuum leak)
 
CNG system fuel pressure is incorrect
 
PCV system problem (i.e., PCV vacuum hose or valve leaking)
 
EVAP canister purge system malfunction
 
Gasoline contaminated engine oil
 
Fuel pressure regulator damage or leaking
 
PCM has failed
 

Trouble Code: P1215



High Pressure Or Low Pressure Lockout, MIL, NGO Circuit Malfunction

Possible Causes:



Natural Gas Output Enable, High Pressure Lockout, Low Pressure Lockout or MIL control circuit is open, shorted to ground or shorted to system power
 
Alternative Fuels ECU is damaged or it has failed
 

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Set the parking brake and block the drive wheels for safety.
 
Verify the hood is closed.
 
Read the trouble codes. If a code is set, refer to that code.
 
Start the engine. Allow engine temperature to reach at least 158ºF (70ºC). Then key off.
 
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
 
Apply the brake pedal firmly and verify the selector is in Park.
 
Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates.
 
Read the trouble codes and recheck for DTC P1336.
 
If DTC P1336 runs and passes, 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: 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: 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: 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
 

Trouble Code: U1048



No Communication With Rear Wheel Steering Control Module

Possible Causes:



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

Trouble Code: U1064



No Communication With Body Control Module

Possible Causes:



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

Trouble Code: U1088



No Communication With SDM (Restraint Module)

Possible Causes:



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

Trouble Code: U1096



No Communication With Instrument Panel Cluster

Possible Causes:



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

Trouble Code: U1097



No Communication With Driver Information Center

Possible Causes:



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

Trouble Code: U1151



No Communication With Vehicle Interface Unit

Possible Causes:



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

Trouble Code: U1152



No Communication With HVAC Control Module

Possible Causes:



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

Trouble Code: U1255



Class 2 Communications 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
 

Trouble Code: U1305



Class 2 Data Link High or Low

Possible Causes:



Class 2 serial data line has either a high or low voltage condition on the circuit, and the module cannot identify the fault
 
One or more modules on Class 2 line has an short to power
 
One or more modules on the Class 2 line has a short to ground
 

 
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