Silverado 2008

5.3L V8 VIN 3 Auto 22

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Trouble Code: P2098



Post Catalyst Fuel Trim System Low Limit (Bank 2)

Possible Causes:



Rich fuel injectors
 
High fuel system pressure
 
Fuel that is contaminated
 
Fuel saturation of the evaporative emissions (EVAP) canister
 
Stuck open or leaking EVAP purge valve
 
Restricted exhaust
 
Incorrect PCV system operation
 

Trouble Code: P2099



Post Catalyst Fuel Trim System High Limit (Bank 2)

Possible Causes:



Exhaust system leaks
 
Engine vacuum leaks
 
Low fuel system pressure
 
Fuel that is contaminated
 
* Malfunctioning fuel injectors
 

Trouble Code: P20E2



Exhaust Temperature Sensor 1-2 Correlation

Possible Causes:



The ECM detects at initial power-up, a temperature difference of greater than 20°C (36°F), exists between exhaust gas temperature sensors 1 and 2.
 
This DTC runs once per key cycle when the above condition is met.
 

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 Actuator Position Performance

Possible Causes:



TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to ground
 
TAC motor control circuit for a short to ground
 
Throttle body has failed
 
ECM has failed
 

Trouble Code: P2105



Throttle Actuator Control (TAC) System - Forced Engine Shutdown

Possible Causes:



Open ignition suppl fuse
 
Ignition voltage supply open or high resistance
 
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: P2119



Throttle Closed Position Performance

Possible Causes:



TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to ground
 
TAC motor control circuit for a short to ground
 
Throttle body has failed
 
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: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Possible Causes:



P2135
 
The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for greater than 2 s.
 

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Possible Causes:



P2138
 
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for greater than 1 s.
 

Trouble Code: P2146



Injector Positive Voltage Control Circuit (Group 1)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P2149



Injector Positive Voltage Control Circuit (Group 2)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P2152



Injector Positive Voltage Control Circuit (Group 3)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P2155



Injector Positive Voltage Control Circuit (Group 4)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P2160



Vehicle Speed Sensor (VSS) 2 Circuit Low Voltage

Possible Causes:



P2160
 
The transfer case output shaft speed is 50 RPM or less for 4.5 seconds.
 

Trouble Code: P2160



Vehicle Speed Sensor (VSS) 2 Circuit Low Voltage

Possible Causes:



P2160
 
No speed signal from the transfer case speed sensor.
 
The transfer case output shaft speed is 50 RPM or less.
 

Trouble Code: P2161



Vehicle Speed Sensor (VSS) 2 Circuit Intermittent

Possible Causes:



P2161
 
The transfer case output shaft speed drops 1,200 RPM or greater for at least 3.25 seconds.
 

Trouble Code: P2161



Vehicle Speed Sensor (VSS) 2 Circuit Intermittent

Possible Causes:



P2161
 
Loss of speed signal from the transfer case speed sensor.
 
Output speed signal is increasing: current transfer case speed signal - last valid output speed greater than 475 RPM.
 
Output speed signal is decreasing: current transfer case speed signal - last valid output speed less than 255 RPM.
 

Trouble Code: P216A



Injector Positive Voltage Control Circuit (Group 5)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P216D



Injector Positive Voltage Control Circuit (Group 6)

Possible Causes:



High voltage control circuit shorted to voltage
 
High voltage control circuit short to ground or an open/high resistance
 
Low voltage control circuit shorted to voltage
 
Low voltage control circuit short to ground or an open/high resistance
 
Faulty fuel injector
 
ECM has failed.
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Possible Causes:



Perform the throttle learn procedure
 
Throttle body has failed.
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Possible Causes:



TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to voltage
 
TAC motor control circuit for a short to ground
 
TAC motor control circuit for a short to ground
 
Throttle body has failed
 
ECM has failed
 

Trouble Code: P2177



Fuel Trim System Lean at Cruise or Accel (Bank1)

Possible Causes:



Leaking crankcase ventilation system
 
Fuel system is operating lean
 
Vacuum leaks that only affect one bank of the engine
 
Lean injectors
 
Fuel contamination
 
Engine mechanical conditions
 
High engine oil level condition
 
engine control module grounds for being clean, tight, and in the correct locations
 
Mass Air Flow (MAF) sensor signal that is skewed
 
Air intake system after the MAF sensor for vacuum leaks
 
Missing, restricted, or leaking exhaust components
 
Heated oxygen sensor (HO2S)
 

Trouble Code: P2178



Fuel Trim System Rich at Cruise or Accel (Bank 1)

Possible Causes:



Mass Air Flow (MAF) sensor signal that is skewed
 
Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Engine control module grounds for being clean, tight, and in the correct locations
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 

Trouble Code: P2179



Fuel Trim System Lean at Cruise or Accel (Bank 2)

Possible Causes:



Leaking crankcase ventilation system
 
Fuel system is operating lean
 
Vacuum leaks that only affect one bank of the engine
 
Lean injectors
 
Fuel contamination
 
Engine mechanical conditions
 
High engine oil level condition
 
engine control module grounds for being clean, tight, and in the correct locations
 
Mass Air Flow (MAF) sensor signal that is skewed
 
Air intake system after the MAF sensor for vacuum leaks
 
Missing, restricted, or leaking exhaust components
 
Heated oxygen sensor (HO2S)
 

Trouble Code: P2180



Fuel Trim System Rich at Cruise or Accel Bank 2

Possible Causes:



Mass Air Flow (MAF) sensor signal that is skewed
 
Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Engine control module grounds for being clean, tight, and in the correct locations
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 

Trouble Code: P2187



Fuel Trim System Lean at Idle (Bank 1)

Possible Causes:



Leaking crankcase ventilation system
 
Fuel system is operating lean
 
Vacuum leaks that only affect one bank of the engine
 
Lean injectors
 
Fuel contamination
 
Engine mechanical conditions
 
High engine oil level condition
 
engine control module grounds for being clean, tight, and in the correct locations
 
Mass Air Flow (MAF) sensor signal that is skewed
 
Air intake system after the MAF sensor for vacuum leaks
 
Missing, restricted, or leaking exhaust components
 
Heated oxygen sensor (HO2S)
 

Trouble Code: P2188



Fuel Trim System Rich at Idle Bank 1

Possible Causes:



Mass Air Flow (MAF) sensor signal that is skewed
 
Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Engine control module grounds for being clean, tight, and in the correct locations
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 

Trouble Code: P2232



HO2S Signal Circuit Shorted to Heater Circuit (Bank 1 Sensor 2)

Possible Causes:



Signal circuit terminal B for a short to the heater control circuit terminal E
 
ECM has failed
 
Faulty HO2S
 

Trouble Code: P2235



HO2S Signal Circuit Shorted to Heater Circuit (Bank 2 Sensor 2)

Possible Causes:



Signal circuit terminal B for a short to the heater control circuit terminal E
 
ECM has failed
 
Faulty HO2S
 

Trouble Code: P2266



Water in Fuel Sensor Circuit Low Voltage

Possible Causes:



The engine is running.
 
The WIF sensor voltage is less than 0.20 volt for more than 1 second.
 

Trouble Code: P2269



Water in Fuel

Possible Causes:



Water in fuel condition
 
WIF circuit short to ground in the harness
 
WIF sensor
 

Trouble Code: P2270



HO2S Signal Stuck Lean (Bank 1 Sensor 2)

Possible Causes:



Water intrusion in the HO2S harness connector
 
Signal circuit terminal B for a short to ground
 
Low fuel system pressure
 
Lean fuel injectors
 
Fuel that is contaminated
 
Vacuum hoses for splits, kinks, and proper connection
 
Air intake system after the Mass Air Flow (MAF) sensor for vacuum leaks
 
Exhaust system leaks
 
Contaminated HO2S - Silicon
 
Engine mechanical condition
 
Faulty HO2S
 
ECM has failed
 

 
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