Silverado 2008

4.3L V6 VIN X Auto 20

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Trouble Code: P0970



Clutch Pressure Control (PC) Solenoid 3 Control Circuit Low Voltage

Possible Causes:



P0970
 
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid control circuit for 300 milliseconds.
 

Trouble Code: P0971



Clutch Pressure Control (PC) Solenoid 3 Control Circuit High Voltage

Possible Causes:



P0971
 
The TCM detects an internal high voltage electrical malfunction of the clutch PC solenoid control circuit for 300 milliseconds.
 

Trouble Code: P0973



Shift Solenoid (SS) 1 Control Circuit Low Voltage

Possible Causes:



P0973
 
The control solenoid (w/body and TCM) valve assembly detects an internal low voltage electrical malfunction of the SS 1 control circuit when the SS 1 is commanded OFF for 300 milliseconds.
 

Trouble Code: P0973



1-2 Shift Solenoid (SS) Control Circuit Low Voltage

Possible Causes:



P0973
 
The TCM detects an open in the 1-2 shift solenoid valve circuit when commanded ON.
 
The TCM detects a short to ground in the 1-2 shift solenoid valve circuit when commanded OFF.
 

Trouble Code: P0974



Shift Solenoid (SS) 1 Control Circuit High Voltage

Possible Causes:



P0974
 
The control solenoid (w/body and TCM) valve assembly detects an internal high voltage electrical malfunction of the SS 1 control circuit when the SS 1 is commanded ON for 300 milliseconds.
 

Trouble Code: P0974



1-2 Shift Solenoid (SS) Control Circuit High Voltage

Possible Causes:



The TCM commands the solenoid ON and the voltage feedback remains high B+.
 

Trouble Code: P0976



Shift Solenoid (SS) 2 Control Circuit Low Voltage

Possible Causes:



P0976
 
The TCM detects an internal low voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded OFF for 300 milliseconds.
 

Trouble Code: P0976



2-3 Shift Solenoid (SS) Control Circuit Low Voltage

Possible Causes:



P0976
 
The TCM detects an open in the 2-3 shift solenoid valve circuit when commanded ON.
 
The TCM detects a short to ground in the 2-3 shift solenoid valve circuit when commanded OFF.
 

Trouble Code: P0977



Shift Solenoid (SS) 2 Control Circuit High Voltage

Possible Causes:



P0977
 
The TCM detects an internal high voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded ON for 300 milliseconds.
 

Trouble Code: P0977



2-3 Shift Solenoid (SS) Control Circuit High Voltage

Possible Causes:



The TCM commands the solenoid ON and the voltage feedback remains high B+.
 

Trouble Code: P0989



Transmission Fluid Pressure (TFP) Switch 5 Circuit Low Voltage

Possible Causes:



P0989
 
The TCM detects that the TFP Switch 5 signal voltage remains low, 0 volts when the low and reverse clutch or the 4-5-6 clutch is commanded ON.
 

Trouble Code: P0990



Transmission Fluid Pressure (TFP) Switch 5 Circuit High Voltage

Possible Causes:



P0990
 
the TCM detects that the TFP Switch 5 signal voltage is high, 12 volts when the low and reverse clutch or the 4-5-6 clutch is commanded OFF.
 

Trouble Code: P1111



IAT Sensor Circuit Intermittent High Input

Possible Causes:



IAT sensor signal circuit is open (intermittent fault)
 
IAT sensor ground circuit is open (intermittent fault)
 
IAT sensor is damaged (an intermittent "open" condition)
 
ECM has failed
 

Trouble Code: P1133



HO2S Insufficient Switching Bank 1 Sensor 1

Possible Causes:



P1133
 
The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
 
DTC P1133 sets within 100 seconds when the above condition is met.
 

Trouble Code: P1153



HO2S Insufficient Switching Bank 2 Sensor 1

Possible Causes:



P0153
 
The ECM detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is more than a calibrated value.
 
DTC P0133 sets within 100 seconds when the above condition is met.
 
P0154
 
The ECM detects that the HO2S 1 parameter is between 350-550 mV for 100 seconds.
 
The Throttle Position (TP) Indicated Angle parameter changes more than 5 percent, 1 time.
 
DTC P0154 sets within 100 seconds when the above conditions are met.
 
P0160
 
The ECM detects that the HO2S 1 parameter is between 410-490 mV.
 
The TP Indicated Angle parameter changes more than 5 percent 1 time.
 
DTC P0160 sets within 100 seconds when the above conditions are met.
 
P1153
 
The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
 
DTC P1153 sets within 100 seconds when the above condition is met.
 
P2272
 
The ECM detects that the affected sensor is below 730 mV.
 
DTC P2272 sets within 1 second when the above condition is met.
 
'
 
P2A04
 
The ECM detects that the HO2S 1 did not transition below 200 mV and above 730 mV during the passive test.
 
One of the following tests fail:
 
The Lean Intrusive Test detects that the sensor is more than 200 mV for 12 seconds.
 
The Rich Intrusive Test detects that the sensor is less than 730 mV for 12 seconds.
 
DTC P2A04 sets within 10 minutes when the above conditions are met.
 

Trouble Code: P1153



HO2S Insufficient Switching Bank 2 Sensor 1

Possible Causes:



P1153
 
The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
 
DTC P1153 sets within 100 seconds when the above condition is met.
 

Trouble Code: P1174



Fuel Trim Cylinder Balance Bank 1

Possible Causes:



Multiple samples of the pre-catalyst HO2S accumulated voltage are consistently greater than the desired value.
 

Trouble Code: P1175



Fuel Trim Cylinder Balance Bank 2

Possible Causes:



Multiple samples of the pre-catalyst HO2S accumulated voltage are consistently greater than the desired value.
 

Trouble Code: P1224



Fuel Injector 1 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1227



Fuel Injector 2 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P122A



Fuel Injector 3 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1233



Fuel Injector 4 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1236



Fuel Injector 5 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1239



Fuel Injector 6 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1242



Fuel Injector 7 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1247



Fuel Injector 8 Control Circuit Shorted

Possible Causes:



The ECM injector output driver detects an incorrect current on a fuel injector circuit.
 
The condition exists for 1 second.
 

Trouble Code: P1258



Engine Coolant Over temperature - Protection Mode Active

Possible Causes:



Coolant temperature more than 132°C (270°F) for greater than 10 seconds.
 

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 158°F (70°C). 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: P1362



ICM Control Circuit High Input

Possible Causes:



IC timing signal is shorted to system power
 
IC timing control circuit and IC timing signal circuits are shorted
 
IC module is damaged or it has failed
 
ECM has failed
 

Trouble Code: P1380



Misfire Detected, Rough Road Data Not Available

Possible Causes:



Use the Freeze Frame/Failure Records data to help find the cause on an intermittent fault. If the code cannot be duplicated, the data in the Freeze Frame/Failure Records can determine how many miles since the code set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the Freeze Frame conditions (i.e., load, engine and vehicle speed, temperature etc.). This will isolate when the code set.
 
Service the ABS before diagnosing a misfire because an actual engine misfire may or may not exist. Also, an actual engine misfire may have occurred during an ABS malfunction.
 
Determine if the vehicle was driven on a rough road, and the ABS could not detect this due to a malfunction. The ECM may interpret variations in crankshaft speed caused by the rough road as a misfire without an actual engine misfire present.
 
Refer to Diagnostic System Check for Antilock Brake System
 
Refer to Diagnostic System Check for the Engine Controls
 

Trouble Code: P1381



Misfire Detected - No Communication with Brake Control Module

Possible Causes:



If any ABS DTCs are set, diagnose those first
 
ABS module
 

Trouble Code: P1400



Cold Start Emission Reduction Control System

Possible Causes:



Air intake system for Damage, restriction, or modification
 
Dirty or deteriorating air filter element
 
Crankcase ventilation system for correct operation
 
Vacuum leak and other un-metered air downstream of the Mass Air Flow (MAF) sensor
 
Intake manifold leak
 
Damaged, restricted, modified or enhanced exhaust system
 
Exhaust leaks
 

Trouble Code: P1415



Secondary Air Injection System (Bank 1) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
ECM has failed
 

Trouble Code: P1416



Secondary Air Injection System (Bank 2) Malfunction

Possible Causes:



Air hoses disconnected, loose, kinked or failed (a burnt hose)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
ECM has failed
 

Trouble Code: P1448



Diesel Particulate Filter Regeneration Frequency Too Low

Possible Causes:



The engine control module (ECM) detects that the average time between the last two completed DPF regenerations is greater than 20 hours, not including idle time.
 
The regeneration engine run time trigger is based on a 14 hour threshold. Therefore, the regeneration event was commanded but never completed, causing DTC P1448 to set.
 

Trouble Code: P150A



Transmission Output Speed Signal Circuit

Possible Causes:



P150A
 
The replicated output speed is 60 RPM or less for 4.5 seconds.
 

Trouble Code: P150B



Transmission Output Speed Sensor Circuit Intermittent

Possible Causes:



P150B
 
The change in replicated output speed is 350 RPM or greater for 3.25 seconds.
 

Trouble Code: P1516



Throttle Actuator Control (TAC) Module 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: P154A



Intake Air (IA) Heater Feedback Circuit

Possible Causes:



The IAH feedback digital response signal to the GPCM is low and the IAH current is high.
 

Trouble Code: P154B



Intake Air (IA) Heater Voltage Signal Circuit

Possible Causes:



Voltage at the IAH voltage signal is 16 volts or more.
 

 
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