Malibu, Malibu MAXX 2006-2008

2.4L L4 VIN B Auto 4

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Trouble Code: P2100



Throttle Actuator Control (TAC) Motor Control Circuit

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body malfuntion
 
ECM has failed
 

Trouble Code: P2101



Control Module Throttle Actuator Position Performance

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body malfuntion
 
ECM has failed
 

Trouble Code: P2101



Throttle Closed Position Performance

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body malfuntion
 
ECM has failed
 

Trouble Code: P2108



Throttle Actuator Control (TAC) Module Performance

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body malfuntion
 
ECM has failed
 

Trouble Code: P2119



Throttle Closed Position Performance

Possible Causes:



Throttle blade that is not in the rest position
 
Throttle valve that is binding open or closed
 
Throttle valve that opens or closes without spring pressure
 
Throttle body malfuntion
 
ECM has failed
 

Trouble Code: P2120



Accelerator Pedal Position Sensor 1 Signal Performance

Possible Causes:



APP sensor connector is damaged, open or shorted
 
APP1 sensor signal circuit is open or shorted to ground
 
APP1 sensor signal circuit is shorted to APP sensor 2 circuit
 
APP1 sensor signal circuit is open or shorted to VREF (5v)
 
APP sensor is damaged or it has failed
 
TAC module is damaged or it has failed
 

Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2123



Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2129



Barometric Pressure (BARO) Sensor Circuit High Voltage

Possible Causes:



Moisture in the vent inlet
 
Debris in the vent inlet
 

Trouble Code: P2135



Throttle Position Sensor 1-2 Correlation Error

Possible Causes:



TP1 sensor signal circuit shorted to TP sensor signal 2 circuit
 
TP1 sensor signal circuit is shorted to the low reference circuit
 
TP2 sensor signal circuit is shorted to the low reference circuit
 
Throttle body assembly is damaged or it has failed
 

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Possible Causes:



Low reference circuit of the APP sensor for a short to voltage, or an open/high resistance.
 
5-volt reference circuit for a short to ground or open/high resistance.
 
Faulty APP Sensor
 
ECM has failed
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Possible Causes:



Perform the throttle learn procedure
 
Throttle body has failed.
 

Trouble Code: P2270



HO2S Signal Stuck Lean Sensor 2

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2271



HO2S Signal Stuck Rich Sensor 2

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2301



Ignition Coil 1 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2303



Ignition Coil 2 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2304



Ignition Coil 2 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2306



Ignition Coil 3 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2307



Ignition Coil 3 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2309



Ignition Coil 4 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2310



Ignition Coil 4 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2312



Ignition Coil 5 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2313



Ignition Coil 5 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2315



Ignition Coil 6 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2316



Ignition Coil 6 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2544



Transmission Torque Request Circuit

Possible Causes:



If DTC P0604 is set, replace the ECM.
 
If DTC P0604 is not set, replace the TCM.
 

Trouble Code: P2610



Control Module Ignition OFF Timer Performance

Possible Causes:



Voltage and ground inputs to the ECM
 
If DTC P0602 is set, attempt to program the ECM before replacing the ECM. If DTC P0602 resets, replace the ECM.
 

Trouble Code: P2A00



HO2S Performance Sensor 1

Possible Causes:



HO2S signal circuit open/high resistance
 
HO2S signal circuit short to voltage
 
HO2S signal circuit open/high resistance
 
HO2S is damaged
 
ECM has failed
 

Trouble Code: P2A01



HO2S Performance Sensor 2

Possible Causes:



Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 
Faulty HO2S
 
ECM has failed
 

Trouble Code: U0020



Low Speed CAN Communication Bus Performance

Possible Causes:



Control modules the vehicle is equipped with
 
Control modules B+, ignition, ground, communication enable and serial data circuit terminals
 
Control module locations on the low and high speed GMLAN serial data circuits
 

Trouble Code: U0073



Control Module Communication Bus Off

Possible Causes:



Control modules the vehicle is equipped with
 
Control module locations on the low speed GMLAN serial data circuit
 
Each control module's low speed GMLAN serial data circuit terminals
 
Control modules the vehicle is equipped with
 
High speed GMLAN serial data circuit terminating resistors
 
Control module locations on the high speed GMLAN serial data circuits
 
Each control module's high speed GMLAN serial data circuit terminals
 

Trouble Code: U1000



Class 2 Communication Malfunction

Possible Causes:



Class 2 circuit is open, shorted to ground or shorted to power
 
ECM ignition power circuit(s) has a high resistance condition
 
ECM 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:



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

Trouble Code: U1026



Loss of ATC Class 2 Communication

Possible Causes:



Check for a loose connection at the ATC module
 
Test the main power and ground circuits to the ATC module
 
Check the Class 2 serial data circuit to the ATC module
 
ATC module may have failed
 

Trouble Code: U1041



Loss of Electronic Brake Controller Communication

Possible Causes:



Check for a loose connection at the EBCM (module)
 
Test the main power and ground circuits to the EBCM (module)
 
Check the Class 2 serial data circuit to the EBCM (module)
 
EBCM (module) may have failed
 

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
 

 
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