Silverado 2008

4.8L V8 VIN C Auto 21

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Trouble Code: P1870



Transmission Component Slipping

Possible Causes:



1-2 shift solenoid valve has sediment, damage or leaking seals
 
2-3 shift solenoid valve has sediment, damage or leaking seals
 
3-2 shift solenoid valve has sediment, damage or leaking seals
 
Valve body regulator apply valve stuck or regulator is scored
 
Torque converter front stator shaft bushing is worn, the stator roller clutch is not holding or it has external damage/leaks
 
Converter clutch valve is stuck or it is installed backwards
 
Converter clutch valve retaining ring is not positioned properly
 
Converter clutch outer valve spring is cocked
 
Pump to case gasket is not positioned properly
 
Orifice cup plugs are restricted or damaged
 
Over-tightened, or unevenly tightened pump body to cover bolts
 
TSB 02-07-30-001 contains a repair procedure for this code
 

Trouble Code: P2002



Diesel Particulate Filter Efficiency

Possible Causes:



The ECM detects that the particulate filter has degraded below a calibrated threshold for greater than 30 seconds.
 

Trouble Code: P2032



Exhaust Temperature Sensor 2 (EGT-2) Circuit Low Voltage

Possible Causes:



P2032
 
The ECM detects that the EGT sensor 2 is less than 0.32 V for greater than 1 s.
 

Trouble Code: P2033



Exhaust Temperature Sensor 2 (EGT-2) Circuit High Voltage

Possible Causes:



P2033
 
The ECM detects that the EGT sensor 2 is greater than 3.37 V for greater than 1 s.
 

Trouble Code: P2088



Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage (Bank 1)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2089



Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage (Bank 1)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2090



Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage (Bank 1)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2091



Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage (Bank 1)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2092



Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage Bank (Bank 2)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2093



Intake Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage (Bank 2)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2094



Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit Low Voltage (Bank 2)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2095



Exhaust Camshaft Position (CMP) Actuator Solenoid Control Circuit High Voltage (Bank 2)

Possible Causes:



Ignition circuit for a short to ground or an open/high resistance
 
Control circuit for a short to voltage or an open/high resistance
 
Control circuit for a short to ground
 
CMP actuator solenoid
 
Faulty ECM
 

Trouble Code: P2096



Post Catalyst Fuel Trim System Low Limit (Bank 1)

Possible Causes:



Malfunctioning 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: P2096



Post Catalyst Fuel Trim System Low Limit (Bank 1)

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: P2097



Post Catalyst Fuel Trim System High Limit (Bank 1)

Possible Causes:



Malfunctioning 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: P2098



Post Catalyst Fuel Trim System Low Limit (Bank 2)

Possible Causes:



Malfunctioning fuel injectors
 
Low fuel system pressure
 
Fuel that is contaminated
 
Missing, loose, or leaking exhaust components from the HO2S forward
 
Vacuum leaks
 
Ethanol concentration greater than 15 percent
 
Incorrect PCV system operation
 

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: 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: 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.
 

 
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