Silverado 2008

4.8L V8 VIN C Auto 22

Print

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: 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
 

Trouble Code: P2271



HO2S Signal Stuck Rich (Bank 1 Sensor 2)

Possible Causes:



Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 
Faulty HO2S
 
ECM has failed
 

Trouble Code: P2272



HO2S Signal Stuck Lean (Bank 2 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
 

Trouble Code: P2273



HO2S Signal Stuck Rich (Bank 1 Sensor 2)

Possible Causes:



Collapsed air intake duct
 
Restricted air filter element
 
Excessive fuel in the crankcase
 
Fuel contamination
 
Rich injectors
 
Engine mechanical conditions
 
Restricted exhaust system
 
Faulty HO2S
 
ECM has failed
 

Trouble Code: P2300



Ignition Coil 1 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2301



Ignition Coil 1 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2303



Ignition Coil 2 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2304



Ignition Coil 2 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2306



Ignition Coil 3 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2307



Ignition Coil 3 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2309



Ignition Coil 4 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2310



Ignition Coil 4 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2312



Ignition Coil 5 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2313



Ignition Coil 5 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2315



Ignition Coil 6 Control Circuit Low Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P2316



Ignition Coil 6 Control Circuit High Voltage

Possible Causes:



Ignition Coil circuit for a short to ground or an open/high resistance
 
Inition Coil circuit for a short to voltage
 
Ignition coil has failed
 
ECM has failed
 

Trouble Code: P244C



Catalyst Temperature Too Low During Regeneration

Possible Causes:



The ECM determines that the EGT sensor 1 is less than 75°C (167°F) of a calibrated threshold, during an active regeneration event.
 
The condition exists for greater than 5 minutes.
 

Trouble Code: P2453



Particulate Matter Trap Differential Pressure Sensor Signal Performance

Possible Causes:



Engine OFF, the ECM detects that the differential pressure is greater than or less than the calibrated threshold for 0.5 second.
 
OR
 
Engine running, the ECM detects that the differential pressure is greater than or less than the calibrated threshold for 1 second.
 
OR
 
The ECM detects that the differential pressure does not respond relative to an increase or decrease in exhaust flow for greater than 1 second.
 

Trouble Code: P2454



Diesel Particulate Filter Differential Pressure Sensor Circuit Low Voltage

Possible Causes:



P2454
 
The ECM detects that the exhaust pressure differential sensor voltage is less than 0.93V for 2 seconds.
 

Trouble Code: P2455



Diesel Particulate Filter Differential Pressure Sensor Circuit High Voltage

Possible Causes:



P2455
 
The ECM detects that the exhaust pressure differential sensor voltage is greater than 4.1V for 2 seconds.
 

Trouble Code: P2457



Exhaust Gas Recirculation (EGR) Cooling System Performance

Possible Causes:



The ECM detects that the temperature difference between both EGR temperature sensors is not within a calibrated range, for greater than 3 seconds. The difference can be from 1°C to 10°C depending on operating conditions.
 

Trouble Code: P2459



Diesel Particulate Filter Regeneration Too Often

Possible Causes:



The ECM detects that the average time between completed regenerations is less than 1 hour 10 minutes.
 

Trouble Code: P251A



Power Take-Off (PTO) Enable Switch Circuit

Possible Causes:



P251A
 
The PTOM detects a high voltage signal on one or more of the in-cab PTO switch circuits: SET -, RES +, 1 or 0.
 
The above condition is present for greater than a predetermined time threshold.
 
This code moves to history after 90 seconds.
 

Trouble Code: P251E



Power Take-Off (PTO) Engine Shutdown Control Circuit Low Voltage

Possible Causes:



P251E or P251F
 
The PTOM detects that the PTO engine shutdown signal circuit is above or below a predetermined voltage threshold.
 
The above condition is present for greater than a predetermined time threshold.
 

Trouble Code: P251F



Power Take-Off (PTO) Engine Shutdown Control Circuit High Voltage

Possible Causes:



P251E or P251F
 
The PTOM detects that the PTO engine shutdown signal circuit is above or below a predetermined voltage threshold.
 
The above condition is present for greater than a predetermined time threshold.
 

Trouble Code: P2534



Ignition 1 Switch Circuit Low Voltage

Possible Causes:



The TCM detects an open or short to ground on the Ignition 1 voltage circuit.
 

Trouble Code: P2534



Ignition 1 Switch Circuit Low Voltage

Possible Causes:



The TCM detects 2 volts or less on the ignition 1 voltage circuit at the TCM for 1.0 second or more.
 

Trouble Code: P253D



Power Take-Off (PTO) Relay Feedback Circuit High Voltage

Possible Causes:



The PTOM detects a high voltage signal at the PTO engage signal circuit.
 
The above condition is present continuously for greater than a predetermined time threshold.
 

 
label.common.footer.alt.autozoneLogo