Silverado 2008

5.3L V8 VIN J Auto 21

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Trouble Code: P1551



Throttle Valve Rest Position Not Reached During Learn

Possible Causes:



Faulty throttle body, (binding, sticking or no spring pressure)
 
Throttle body has failed
 

Trouble Code: P1585



Cruise Control Inhibit Output Circuit Malfunction

Possible Causes:



Cruise control inhibit circuit is shorted to system voltage
 
Cruise control inhibit circuit is open or shorted to ground
 
Cruise control module power circuit is open (test CR CNT fuse)
 
Cruise control module is damaged or has failed
 
ECM has failed
 

Trouble Code: P159C



Power Take-Off (PTO) Remote Engine Shutdown Switch Circuit

Possible Causes:



The PTOM detects a signal mismatch between the remote engine shut off signal and the PTO engine shutdown signal.
 
The above condition is present for greater than a predetermined time threshold.
 

Trouble Code: P1621



Transmission Control Module (TCM) Long Term Memory Performance

Possible Causes:



The control solenoid (w/body and TCM) valve assembly has detected an internal malfunction.
 

Trouble Code: P1668



Generator L-Terminal Control Circuit

Possible Causes:



During the Key ON test the ECM detects high voltage on the generator turn on signal circuit for 5 seconds.
 
With the engine running the ECM detects low voltage on the generator turn on signal circuit for 15 seconds.
 

Trouble Code: P166B



Intake Air (IA) Heater Over Temperature

Possible Causes:



The IAH temperature is more than 80°C (176°F) for more than 3 seconds.
 

Trouble Code: P166C



Intake Air (IA) Heater Resistance

Possible Causes:



The resistance in the IAH is more than a calibrated amount for more than 3 seconds.
 

Trouble Code: P1684



Transmission Control Module (TCM) Power Up Temperature Sensor Performance

Possible Causes:



P1684 - Fail Case 1
 
Vehicle speed is greater than 8 km/h (5 mph) for 300 seconds cumulative.
 
TCC slip speed is greater than 120 RPM for 300 seconds cumulative.
 
The TCM power up temperature is between -40 and +21°C (-40 and +70°F).
 
The TCM power up temperature has changed by less than 2°C (3.6°F) in 100 seconds.
 
The transmission fluid temperature (TFT) is greater than 70°C (158°F).
 
The TFT has increased by 55°C (99°F) since startup.
 
P1684 - Fail Case 2
 
Vehicle speed is greater than 8 km/h (5 mph) for 300 seconds cumulative.
 
TCC slip speed is greater than 120 RPM for 300 seconds cumulative.
 
The TCM temperature sensor is between 120-150°C (248-302°F).
 
The TCM power up temperature has changed by less than 2°C (3.6°F) in 100 seconds.
 
The TFT is greater than 70°C (158°F).
 
The TFT has increased by 55°C (99°F) since startup.
 
P1684 - Fail Case 3
 
The TCM power up temperature changes by greater than or equal to 20°C (36°F) 14 times over 7 seconds.
 

Trouble Code: P1685



Transmission Control Module (TCM) Power Up Temperature Sensor Circuit Low Voltage

Possible Causes:



P1685
 
The TCM power up temperature is less than or equal to -61°C (-77°F) for greater than 10 seconds.
 

Trouble Code: P1686



Transmission Control Module (TCM) Power Up Temperature Sensor Circuit High Voltage

Possible Causes:



P1686
 
The TCM power up temperature is greater than or equal to 161°C (321°F) for greater than 10 seconds.
 

Trouble Code: P1688



Unmanaged Engine Torque Delivered to Transmission Control Module (TCM) Signal

Possible Causes:



DTC P1688 sets if unmanaged engine torque, gross, signal is less than 1.5 percent or greater than 98.5 percent for greater than a 2 seconds.
 

Trouble Code: P1751



Shift Valve 1 Performance

Possible Causes:



The TCM detects attained gear slip greater than 75 RPM for 0.5 seconds.
 

Trouble Code: P1761



Up Down Shift Switch Signal Circuit

Possible Causes:



The TCM detects 5 error counts out of 10 samples within 10 seconds.
 

Trouble Code: P1762



Transmission Mode Switch Signal Circuit

Possible Causes:



The TCM detects an error in the rolling count value that does not match with the BCM.
 

Trouble Code: P1762



Transmission Mode Switch Signal Circuit

Possible Causes:



The TCM detects 5 error counts out of 10 samples within 10 seconds.
 

Trouble Code: P1779



Engine Torque Delivered to Transmission Control Module (TCM) Signal

Possible Causes:



DTC P1779 sets if managed engine torque, net, signal is less than 1.5 percent or greater than 98.5 percent for greater than 2 seconds.
 

Trouble Code: P1810



TFP Valve Position Switch Assembly

Possible Causes:



TFP valve position switch signal circuit is open, grounded or shorted to another signal
 
TFP valve position switch is damaged or has failed
 
This code can set during fluid refilling. After refilling the fluid, cycle the key "off", then idle the engine for 20 seconds. Turn the key "off" and Allow the ECM to power down.
 
This code can set due to low pump pressure or due to a stuck pressure regulator.
 
This code can set due to a rolled forward clutch piston seal. It may Allow the ECM to see a 2.08:1 ratio (reverse) when the manual valve position is actually indicated in D4.
 
ECM has failed
 

Trouble Code: P1815



Transmission Fluid Pressure (TFP) Valve Position Switch - Start in Wrong Range

Possible Causes:



P1815
 
The TCM detects D2 only, TFP manual valve position switch state during and after engine start for 3.25 seconds.
 

Trouble Code: P1816



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Park/Neutral (P/N) with Drive Ratio

Possible Causes:



P1816
 
The TCM detects one of the following conditions for 6 seconds.
 
PARK/NEUTRAL indicated with a 1st gear ratio.
 
PARK/NEUTRAL indicated with a 2nd gear ratio.
 
PARK/NEUTRAL indicated with a 3rd gear ratio.
 
PARK/NEUTRAL indicated with a 4th gear ratio.
 

Trouble Code: P1818



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio

Possible Causes:



P1818
 
The TCM detects the following condition for 5 seconds.
 
PARK/NEUTRAL or FORWARD range indicated with a reverse gear ratio.
 

Trouble Code: P1825



Internal Mode Switch - Invalid Range

Possible Causes:



P1825
 
Any one of the following Fail Cases occur:
 

Trouble Code: P1831



Pressure Control (PC)/Shift Lock Solenoid Control Circuit Low Voltage

Possible Causes:



P1831
 
The TCM detects an internal open or short to ground in the high side driver 1 for 3 out of 5 seconds.
 

Trouble Code: P1832



Pressure Control (PC)/Shift Lock Solenoid Control Circuit High Voltage

Possible Causes:



P1832
 
The TCM detects an internal short to voltage on the high side driver 1 circuit for 3 out of 5 seconds.
 

Trouble Code: P1860



TCM PWM Solenoid Circuit Malfunction

Possible Causes:



TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid control circuit is shorted to system power (B+)
 
TCC solenoid power circuit is open (test TRANS or IGN fuse)
 
TCC solenoid is damaged or has failed
 
ECM has failed
 

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
 

 
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