P11C2 Possible Causes

• Faulty intake air humidity sensor
• Intake air humidity sensor harness is open or shorted
• Poor electrical connection in the intake air humidity sensor circuit

How is P11C2 Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Possible Symptoms

• Engine light on (or service engine soon warning light)

P11C2 Meaning

The Powertrain Control Module (PCM) monitors the signal from the intake air humidity sensor. The PCM sets the OBDII code when the intake air humidity sensor does not meet factory specifications.

P11C3 Possible Causes

• Faulty intake air humidity sensor
• Intake air humidity sensor harness is open or shorted
• Poor electrical connection in the intake air humidity sensor circuit

How is code P11C3 repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Possible Symptoms

• Engine light on (or service engine soon warning light)

P11C3 Meaning

The Powertrain Control Module (PCM) monitors the intake air humidity sensor signal. The PCM sets the OBDII code when the intake air humidity sensor does not meet factory specifications.

P11C4 Possible Causes

• Faulty intake air humidity sensor
• Intake air humidity sensor harness is open or shorted
• Poor electrical connection in the intake air humidity sensor circuit

How is code P11C4 repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Technical Notes

Possible Symptoms

• Engine light on (or engine service warning light soon)

P11C4 Meaning

The Powertrain Control Module (PCM) monitors the intake air humidity sensor signal. The PCM sets the OBDII code when the intake air humidity sensor does not meet factory specifications.

P11C8 Possible Causes

• Faulty pedal position sensor
• Pedal position sensor harness is open or shorted
• Poor electrical connection in pedal position sensor circuit

How to Fix Code P11C8?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Engine light on (or engine warning light soon to come on)

P11C8 Meaning

The Engine Control Module (ECM) monitors the pedal position sensor. The ECM sets the OBDII code when the pedal position sensor does not meet factory specifications.

P11C9 Possible Causes

• Faulty Intake Air Temperature (IAT) sensor
• Intake Air Temperature (IAT) sensor harness is open or shorted
• Poor electrical connection in the Intake Air Temperature (IAT) sensor circuit

How is code P11C9 repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Check Engine Light on (or service engine soon warning light)

P11C9 Meaning

The Intake Air Temperature (IAT) sensor is a temperature-sensitive variable resistor that measures the air temperature in the intake system. The sensor’s resistance will change depending on the air temperature. The higher the temperature, the lower the resistance. The Engine Control Module (ECM) provides a reference voltage and monitors the voltage drop between a fixed-value internal resistor and the sensor’s resistance. This is called a voltage divider circuit.
IAT sensor values are used by the ECM processor to help calculate idle speed, fuel mixture, and ignition timing.
Inaccurate IAT sensor voltages can affect pulse width, idle quality, and tailpipe emissions. Intermittent signals can cause hesitation, stumbling, and surging. If an IAT sensor failure accompanies an Engine Coolant Temperature (ECT) sensor failure, cooling fan operation may also be affected.
Some manufacturers integrate the Intake Air Temperature (IAT) sensor as part of the Mass Air Flow (MAF) sensor (air flow meter).

P11CB Possible Causes

• Faulty barometric pressure sensor
• Barometric pressure sensor harness is open or shorted
• Poor electrical connection in the barometric pressure sensor circuit

How is Code P11CB Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Check Engine Light on (or Service Engine Soon warning light)

P11CB Meaning

The Engine Control Module (ECM) monitors the barometric pressure sensor. The ECM sets the OBDII code when the barometric pressure sensor does not meet factory specifications.

P11CB GMC Possible Causes

• Faulty NOx sensor 1
• NOx sensor 1 harness is open or shorted
• Poor electrical connection in NOx sensor 1 circuit
• Intake system leaks
• Exhaust system leaks

How is GMC P11CB Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Engine light on (or engine service soon warning light)

P11CB GMC Meaning

The Powertrain Control Module (PCM) monitors NOx sensor 1. The PCM sets the OBDII code when NOx sensor 1 does not meet factory specifications.

P11CB CHEVROLET Possible Causes

• Faulty NOx sensor 1
• NOx sensor 1 harness is open or shorted
• Poor electrical connection in NOx sensor 1 circuit
• Intake system leaks
• Exhaust system leaks

How to Fix Code P11CB CHEVROLET?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Engine light on (or service engine soon warning light)

P11CB CHEVROLET Meaning

The Powertrain Control Module (PCM) monitors NOx sensor 1. The PCM sets the OBDII code when NOx sensor 1 does not meet factory specifications.

Possible Causes of P11CC

• Faulty Nox sensor 1
• Nox sensor 1 harness is open or shorted
• Poor electrical connection in Nox sensor 1 circuit
• Intake system leaks
• Exhaust system leaks

How is P11CC Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Engine light on (or engine service soon warning light)

Meaning of P11CC

The Powertrain Control Module (PCM) monitors the Nox sensor 1. The PCM sets the OBDII code when the Nox sensor 1 does not meet factory specifications.

P11CC CHEVROLET Possible Causes

• Faulty NOx sensor 1
• NOx sensor 1 harness is open or shorted
• Poor electrical connection in NOx sensor 1 circuit
• Intake system leaks
• Exhaust system leaks

How to Fix P11CC CHEVROLET Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

• Engine light on (or engine service soon warning light)

P11CC CHEVROLET Meaning

The Powertrain Control Module (PCM) monitors NOx sensor 1. The PCM sets the OBDII code when NOx sensor 1 does not meet factory specifications.