Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

6.0L V8 VIN N Auto 1

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6.0L V8 VIN N Auto

Trouble Code: P0101



MAF Sensor Signal Range/Performance

Possible Causes:



Base engine vacuum leak, PCV valve leaking or stuck open
 
Engine oil dipstick missing or not fully seated
 
MAF sensor element (wire) is contaminated or it has failed
 
MAF sensor signal circuit or ground circuit has high resistance
 
PCM has failed
 

Trouble Code: P0102



MAF Sensor Circuit Low Frequency

Possible Causes:



MAF sensor element hot wire contaminated or the sensor failed
 
MAF sensor signal shorted to ground or ground circuit problem
 
MAF sensor wiring routed close to the ignition wires, generator, solenoids or electric motors (this causes it to pick up EMI/RFI)
 
PCM has failed
 
TSB 76-65-04 contains a repair procedure for this code
 

Trouble Code: P0103



MAF Sensor Circuit High Frequency

Possible Causes:



MAF sensor power circuit has a high resistance condition
 
MAF sensor is contaminated, dirty or it has failed
 
MAF sensor wiring routed close to Generator or ignition wires
 
Water enters the air intake system reaches the MAF sensor, cools it, and causes it to indicate excessive airflow (check AIR system)
 
PCM has failed
 

Trouble Code: P0106



MAP Sensor Signal Range/Performance

Possible Causes:



MAP sensor seal is missing or damage, intake manifold leaks
 
MAP sensor is contaminated, dirty, skewed or has failed
 
MAP sensor vacuum line is loose, restricted or contains "ice"
 
PCM has failed
 

Trouble Code: P0120



TP Sensor 1 Signal Range/Performance

Possible Causes:



TAC connector contaminated with water (causes other codes)
 
TP Sensor 1 low reference circuit is shorted to ground
 
TP Sensor 1 signal circuit is open or shorted to ground
 
APP Sensor signal or VREF circuit is open or shorted to power
 
APP Sensor ground circuit is open or shorted to system power
 
APP Sensor is damaged or it has failed (it may be cracked)
 
APP Sensor assembly is damaged or it has failed
 
TAC assembly is damaged or it has failed
 
TSB 03-04-06-034 contains a repair procedure for this code
 

Trouble Code: P0121



TP Sensor Signal Range/Performance

Possible Causes:



TP sensor signal circuit open or shorted to ground (intermittent)
 
TP sensor is damaged or it failed (may be cracked or sticking)
 
TSB 76-65-04 contains a repair procedure for this code
 

Trouble Code: P0122



TP Sensor Circuit Low Input

Possible Causes:



TP sensor signal circuit is shorted to sensor ground
 
TP sensor signal circuit is open (except 1996-1998 models)
 
TP sensor VREF circuit is open between sensor and PCM
 
TP sensor is damaged or it failed (it may be shorted)
 
PCM is damaged or has failed
 

Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP sensor signal circuit is shorted to VREF or system power
 
TP sensor ground circuit is open between the sensor and PCM
 
TP sensor is damaged or it failed (it may be open)
 
PCM is damaged or has failed
 

Trouble Code: P0132



HO2S-11 (Bank 1 Sensor 1) Circuit High Input

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 tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

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 tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) Insufficient Activity

Possible Causes:



HO2S heater is damaged or has failed
 
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)
 
PCM has failed
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater low control circuit is open or shorted to ground
 
HO2S heater circuit is open or it is shorted to ground
 
HO2S heater power circuit is open (test O2A fuse in fuse block)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0137



HO2S-12 (Bank 1 Sensor 2) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Circuit High Input

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 tracking in connector (short between the HO2S signal and power circuits)
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Insufficient Activity

Possible Causes:



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)
 
PCM has failed
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater low control circuit is open or shorted to ground
 
HO2S heater circuit is open or it is shorted to ground
 
HO2S heater power circuit is open (test O2A fuse in fuse block)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0151



HO2S-21 (Bank 2 Sensor 1) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0152



HO2S-21 (Bank 2 Sensor 1) Circuit High Input

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 tracking in the connector causing a short to power
 
PCM has failed
 

Trouble Code: P0153



HO2S-21 (Bank 2 Sensor 1) Slow Response

Possible Causes:



Fuel system rich (high fuel pressure, fuel pressure regulator leaking, or leaking injectors)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0155



HO2S-21 (Bank 2 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater low control circuit is open or shorted to ground
 
HO2S heater circuit is open or it is shorted to ground
 
HO2S heater power circuit is open (test O2A fuse in fuse block)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0157



HO2S-22 (Bank 2 Sensor 2) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0158



HO2S-22 (Bank 2 Sensor 2) Circuit High Input

Possible Causes:



Fuel system rich (high fuel pressure, fuel pressure regulator leaking, or injector sticking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0160



HO2S-22 (Bank 2 Sensor 2) Insufficient Activity

Possible Causes:



HO2S heater is damaged or it has failed
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
PCM has failed
 

Trouble Code: P0161



HO2S-22 (Bank 2 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater low control circuit is open or shorted to ground
 
HO2S heater circuit is open or it is shorted to ground
 
HO2S heater power circuit is open (test O2A fuse in fuse block)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0169



Fuel Composition Sensor Circuit Malfunction

Possible Causes:



FCS is contaminated, damaged or skewed
 
Fuel is contaminated due to a higher than normal alcohol level
 
Ethanol concentration is higher than 85% (E85)
 
Methanol fuel is not recommended, and can cause this code
 

Trouble Code: P0171



Fuel Trim System Lean (Bank 1)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor is out of calibration (ECT, IAT or MAF)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0172



Fuel Trim System Rich (Bank 1)

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
Excess fuel vapors in crankcase (the oil needs to be changed)
 
EVAP system component has failed or canister fuel saturated
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0174



Fuel Trim System Lean (Bank 2)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor is out of calibration (ECT, IAT or MAF)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0175



Fuel Trim System Rich (Bank 2)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor is out of calibration (ECT, IAT or MAF)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0200



Fuel Injector Circuit Malfunction

Possible Causes:



Fuel injector control circuit is open between injector and PCM
 
Fuel injector control circuit is grounded between injector and PCM
 
Fuel injector power circuit is open (test INJ A, B in fuse block)
 
Fuel injector is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0220



Throttle Position Sensor 2 Circuit Malfunction

Possible Causes:



TP Sensor 2 signal circuit is open or shorted to ground
 
TP Sensor 2 VREF (5v) circuit is open, or TP Sensor 2 ground circuit is open
 
TP Sensor 2 is damaged or has failed
 
PCM is damaged
 
TSB 03-04-06-034 contains a repair procedure for this code
 

Trouble Code: P0230



Fuel Pump Relay Control Circuit Malfunction

Possible Causes:



Fuel pump relay control circuit is open or shorted to ground
 
Fuel pump relay power circuit is open (PCM Fuse B fuse block)
 
Fuel pump relay is damaged or it has failed
 
PCM is damaged
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Base engine mechanical fault that affects one or more cylinders
 
EGR valve is stuck open or PCV system has a vacuum leak
 
EVAP system problem or the EVAP canister is fuel saturated
 
Fuel metering fault that affects more than one cylinder
 
Fuel pressure too low or too high, fuel supply contaminated
 
IC control circuit is shorted to ground (an intermittent fault)
 
Ignition system fault (a coil) that affects more than one cylinder
 
MAF sensor contamination (it can cause a very lean condition)
 
TSB 03-06-04-030 contains a repair procedure for this code
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 1
 
Fuel delivery component fault (injector) that affects Cylinder 1
 
Ignition system problem (coil, plug) that affects only Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 2
 
Fuel delivery component fault (injector) that affects Cylinder 2
 
Ignition system problem (coil, plug) that affects only Cylinder 2
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 3
 
Fuel delivery component fault (injector) that affects Cylinder 3
 
Ignition system problem (coil, plug) that affects only Cylinder 3
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 4
 
Fuel delivery component fault (injector) that affects Cylinder 4
 
Ignition system problem (coil, plug) that affects only Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 5
 
Fuel delivery component fault (injector) that affects Cylinder 5
 
Ignition system problem (coil, plug) that affects only Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 6
 
Fuel component fault that affects only Cylinder 6 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 6
 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 7
 
Fuel component fault that affects only Cylinder 7 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 7
 

 
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