Silverado 2008

5.3L V8 VIN 3 Auto 12

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Trouble Code: P0117



Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

Possible Causes:



P0117
 
The ECM detects that the ECT Sensor is warmer than 149°C (300°F) for more than 10 seconds.
 

Trouble Code: P0118



Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Possible Causes:



ECT sensor low reference circuit for an open/high resistance.
 
ECT sensor signal circuit for a short to ground
 
ECT sensor signal circuit for a short to voltage or an open/high resistance
 
ECT sensor has failed
 
ECM has failed
 

Trouble Code: P0120



Throttle Position (TP) Sensor 1 Circuit

Possible Causes:



P0120
 
TP sensor 1 voltage is less than 0.325 V or greater than 4.75 V for greater than 1 s.
 

Trouble Code: P0121



Throttle Position (TP) Sensor 1 Performance

Possible Causes:



Loose or damaged throttle blade
 
Broken throttle shaft
 
Any throttle body damage
 
Throttle body assembly has failed
 

Trouble Code: P0122



Throttle Position (TP) Sensor 1 Circuit Low Voltage

Possible Causes:



P0122
 
The ECM detects that the TP sensor 1 voltage is less than 0.325 V for greater than 1 s.
 

Trouble Code: P0123



Throttle Position (TP) Sensor 1 Circuit High Voltage

Possible Causes:



P0123
 
The ECM detects that the TP sensor 1 voltage is greater than 4.75 V for greater than 1 s.
 

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

Possible Causes:



The ECM detects that the minimum ECT of 75°C (167°F) has not been met, when the IAT is greater than 10°C (50°F).
 
OR
 
The ECM detects that the minimum ECT of 55°C (131°F) has not been met, when the IAT is less than 10°C (50°F).
 

Trouble Code: P0128



Engine Coolant Temperature (ECT) Below Thermostat Temperature

Possible Causes:



The engine did not meet the ECT target temperatures of 50°C (120°F) low region or 72°C (162°F) high region during expected calibrated warm-up times and start-up temperatures.
 

Trouble Code: P0131



HO2S Circuit Low Voltage (Bank 1 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0132



HO2S Circuit High Voltage (Bank 1 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0133



HO2S Slow Response Bank 1 Sensor 1

Possible Causes:



P0133
 
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.
 

Trouble Code: P0134



HO2S Circuit Insufficient Activity Bank 1 Sensor 1

Possible Causes:



P0134
 
The ECM detects that the HO2S 1 parameter is between 350-550 mV for 100 seconds.
 
DTC P0134 sets within 100 seconds when the above conditions are met.
 

Trouble Code: P0135



HO2S Heater Performance (Bank 1 Sensor 1)

Possible Causes:



HO2S ignition circuit for a short to ground or an open/high resistance
 
HO2S control circuit for a short to voltage, or an open/high resistance
 
HO2S control circuit for a short to ground
 
HO2S is damaged or it has failed
 
ECM has failed
 

Trouble Code: P0137



HO2S Circuit Low Voltage Bank 1 Sensor 2

Possible Causes:



P0137
 
The ECM detects that the HO2S 1 voltage parameter is less than 50 mV.
 
DTC P0137 sets within 100 seconds during the lean test when the above condition is met.
 

Trouble Code: P0138



HO2S Circuit High Voltage (Bank 1 Sensor 2)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P013C



HO2S Slow Response Rich to Lean Bank 2 Sensor 2

Possible Causes:



P013C
 
The ECM detects that the accumulated mass air flow monitored during rich-to-lean transitions between 450-150 mV is more than 50 grams.
 

Trouble Code: P013D



HO2S Slow Response Lean to Rich Bank 2 Sensor 2

Possible Causes:



P013D
 
The ECM detects that the accumulated mass air flow monitored during lean-to-rich transitions between 350-650 mV is more than 50 grams.
 

Trouble Code: P0140



HO2S Circuit Insufficient Activity (Bank 1 Sensor 2)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0141



HO2S Heater Performance (Bank 1 Sensor 2)

Possible Causes:



HO2S ignition circuit for a short to ground or an open/high resistance
 
HO2S control circuit for a short to voltage, or an open/high resistance
 
HO2S control circuit for a short to ground
 
HO2S is damaged or it has failed
 
ECM has failed
 

Trouble Code: P014A



HO2S Delayed Response Rich to Lean Bank 2 Sensor 2

Possible Causes:



P014A
 
The ECM detects that the O2 sensor cannot achieve voltage below 450 mV within 50 grams of accumulated air flow.
 

Trouble Code: P014B



HO2S Delayed Response Lean to Rich Bank 2 Sensor 2

Possible Causes:



P014B
 
The ECM detects that the O2 sensor cannot achieve voltage above 350 mV within 50 grams of accumulated air flow.
 

Trouble Code: P0151



HO2S Circuit Low Voltage Bank (2 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0152



HO2S Circuit High Voltage (Bank 2 Sensor 1)

Possible Causes:



HO2S low reference circuit for an open/high resistance
 
HO2S signal circuit for a short to ground
 
HO2S signal circuit for a short to voltage
 
HO2S signal circuit for an open/high resistance
 
HO2S has failed
 
ECM has failed
 

Trouble Code: P0153



HO2S Slow Response 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: P0153



HO2S Slow Response 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 P0153 sets within 100 seconds when the above condition is met.
 

Trouble Code: P0154



HO2S 21 (Bank 2 Sensor 1) Insufficient Activity

Possible Causes:



HO2S damaged or has failed
 
Low or high fuel system pressure
 
Engine vacuum leaks
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0154



Insufficient Activity (Bank 2 Sensor 1)

Possible Causes:



HO2S damaged or has failed
 
Low or high fuel system pressure
 
Engine vacuum leaks
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0155



HO2S Heater Performance (Bank 2 Sensor 1)

Possible Causes:



HO2S heater control circuit is open or it is shorted to ground
 
HO2S control circuit open or high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0157



HO2S Circuit Low Voltage (Bank 2 Sensor 2)

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
low reference circuit for an open/high resistance or for a short to voltage
 
Fuel pressure that is too low or too high
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
Lean, rich, or leaking fuel injectors
 
ECM has failed
 

Trouble Code: P0158



HO2S Circuit High Voltage (Bank 2 Sensor 2)

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal circuit is shorted to system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
ECM has failed
 

Trouble Code: P0160



HO2S Circuit Insufficient Activity (Bank 2 Sensor 2)

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal circuit is shorted to system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
ECM has failed
 

Trouble Code: P0161



HO2S Heater Performance (Bank 2 Sensor 2)

Possible Causes:



HO2S heater control circuit is open or it is shorted to ground
 
HO2S control circuit open or high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
ECM has failed
 

Trouble Code: P0167D



Control Module Ignition Coil Internal Circuit

Possible Causes:



The ECM must be replaced to correct this problem. A new ECM must be programmed with the correct software/calibration.
 

Trouble Code: P0168



Engine Fuel Over-Temperature

Possible Causes:



The fuel temperature sensor is above 115°C (239°F) for more than 10 seconds.
 
DTC P0181, P0182 or P0183 are not set.
 

Trouble Code: P0171



Fuel Trim System Lean

Possible Causes:



Low fuel pressure
 
Fuel contamination
 
Malfunctioning fuel injectors
 
Missing, loose, or leaking exhaust components from the HO2S forward
 
Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
 
Air induction system and the air intake ducts for leaks or for a missing air filter element
 
Cracked EVAP canister
 
Crankcase ventilation system for leaks
 
The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
 
HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
 
Malfunctioning engine components
 
HO2S sensor has failed
 
MAP sensor
 
MAF sensor
 

Trouble Code: P0172



Fuel Trim System Rich

Possible Causes:



Vacuum hoses for splits, kinks, and improper connections
 
Air intake duct for being collapsed or restricted
 
Air filter for being dirty or restricted
 
Objects blocking the throttle body
 
Excessive fuel in the crankcase due to leaking fuel injectors
 
evaporative emissions control system for improper operation
 
Excessive fuel pressure--
 
Malfunctioning fuel injectors
 
Fuel contamination
 
The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
 
HO2S signal circuit shorted to voltage
 
HO2S sensor has failed
 
MAP sensor
 
MAF sensor
 

Trouble Code: P0181



Fuel Temperature Sensor Performance

Possible Causes:



The fuel temperature and the IAT Sensor 1 are more than 100°C (180°F) of each other at start-up.
 
OR
 
The fuel temperature and the IAT Sensor 1 are more than 10°C (18°F) of each other at start-up.
 
AND
 
The IAT has not dropped more than 2.5°C (4.5°F) after running more than 6 minutes above 24 km/h (15 mph).
 

Trouble Code: P0182



Fuel Temperature Sensor Circuit Low Voltage

Possible Causes:



P0182
 
The fuel temperature sensor is more than 120°C (248°F) for 1 second.
 

Trouble Code: P0183



Fuel Temperature Sensor Circuit High Voltage

Possible Causes:



P0183
 
The fuel temperature sensor is less than -38°C (-38.4°F) for 1 second.
 

Trouble Code: P0191



Fuel Rail Pressure (FRP) Sensor Performance

Possible Causes:



(A condition with the fuel tank module or the fuel pump control module (FECM) will set this DTC)
 
low reference circuit for an open/high resistance
 
5-volt reference circuit for a short to ground or an open/high resistance
 
5-volt reference circuit for a short to voltage
 
signal circuit terminal 12 for a short to ground
 
FRP sensor is damaged or it has failed
 
ECM has failed
 

 
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