P11DB – Current Performance of NOx Sensor, Bank 1 Sensor 1

Possible Causes of P11DB

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How is P11DB 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 warning light soon)

Meaning of P11DB

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pumping cell to maintain a constant voltage in the sensing cell. The amount of current needed to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
The smart NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P11DB Chevrolet – Current Performance of NOx Sensor, Bank 1 Sensor 1

P11DB CHEVROLET Possible Causes

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How to Fix P11DB 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

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

P11DB CHEVROLET Meaning

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pump cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pump cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pump cell to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
Smart NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P11DB GMC – Current Performance of NOx Sensor, Bank 1 Sensor 1

P11DB GMC Possible Causes

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How is P11DB GMC 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 warning light soon)

P11DB GMC Meaning

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pump cell, and a heater. An exhaust gas sample passes through a diffusion gap between the sensing cell and the pump cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pump cell to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
Intelligent NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The intelligent NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P11DC – Current Performance of NOx Sensor, Bank 1 Sensor 2

Possible Causes of P11DC

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How is Code P11DC 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)

P11DC Meaning

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pumping cell, and a heater. An exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pumping cell to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
Smart NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P11DC CHEVROLET – Current Performance of NOx Sensor, Bank 1 Sensor 2

P11DC CHEVROLET Possible Causes

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How to Fix Code P11DC 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 engine service warning light soon)

P11DC CHEVROLET Meaning

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pump cell, and a heater. An exhaust gas sample passes through a diffusion gap between the sensing cell and the pump cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pump cell to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
Smart NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with an NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P11DC GMC – Current Performance of NOx Sensor, Bank 1 Sensor 2

P11DC GMC Possible Causes

  • Faulty nitrogen oxide (NOx) sensor
  • Nitrogen oxide (NOx) sensor harness is open or shorted
  • Poor electrical connection in the nitrogen oxide (NOx) sensor circuit

How is GMC Code P11DC 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 warning light soon service)

P11DC GMC Meaning

The reduction system uses two nitrogen oxide (NOx) sensors to monitor the amount of NOx in the engine’s exhaust gases. The first sensor is located at the turbocharger outlet and monitors the engine’s NOx level. The second NOx sensor is located between the selective catalytic reduction (SCR) and the diesel particulate filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the engine control module (ECM) with information about the exhaust oxygen level during DPF regeneration.
Each NOx sensor contains a sensing cell, a pumping cell, and a heater. An exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit inside the sensor controls the pump current through the pumping cell to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the NOx concentration in the exhaust.
The ECM varies the amount of diesel exhaust fluid (DEF) or reductant added by varying the duty cycle of the reductant injector in response to changes in engine exhaust NOx levels.
Intelligent NOx sensors consist of two components, the NOx module and the NOx sensor element, which are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The intelligent NOx sensor module communicates the condition to the ECM via the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module.

P1200 – Injector Driver Circuit

P1200 Possible Causes

  • Faulty fuel injector
  • Fuel injector harness is open or shorted
  • Poor electrical connection in the fuel injector circuit

How is Code P1200 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 warning light soon)

P1200 Meaning

While the engine is running, the Powertrain Control Module (PCM) detects an incorrect voltage level on one or more fuel injector control circuits for more than 5 seconds.

P1200 AUDI – Mechanical malfunction of the turbocharger recirculation valve

P1200 AUDI Possible Causes

  • Check the turbocharger recirculation valve for mechanical failure
 

How to Fix P1200 AUDI 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 warning light soon)
 

P1200 AUDI Meaning

Turbocharger recirculation valve mechanical malfunction is the generic description for Audi P1200 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Audi P1200 OBDII code.

P1200 BUICK – Fuel Injector Circuit

P1200 BUICK Possible Causes

  • Faulty fuel injector
  • Fuel injector harness is open or shorted
  • Poor electrical connection in fuel injector circuit

How to Fix P1200 BUICK 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 warning light soon)

P1200 BUICK Meaning

While the engine is running, the Powertrain Control Module (PCM) detects an incorrect voltage level on one or more fuel injector control circuits for more than 5 seconds.

P1200 CADILLAC – Fuel Injector Circuit

Meaning of Code P1200

Code P1200 is a generic OBD-II code specific to Cadillac vehicles. It indicates that the Powertrain Control Module (PCM) has detected an abnormal voltage level in one or more fuel injector control circuits for more than 5 seconds while the engine is running. This issue can disrupt fuel metering, affecting engine performance and efficiency.

Common Symptoms

  • Check engine light on (or warning message).
  • Hard starting or engine stalling.
  • Unstable idle or abnormal vibrations.
  • Reduced performance (weak acceleration).
  • Increased fuel consumption.

Possible Causes

  1. Faulty fuel injector:
    • Damaged internal coil or open circuit.
    • Partial blockage or injector leak.
  2. Electrical issues:
    • Short circuit or open circuit in the injector harness.
    • Oxidized, loose, or corroded connectors.
  3. PCM failure:
    • Programming error or internal module malfunction.

Diagnostic Procedures

  1. Visual Inspection:
    • Examine the injector wiring harness and connectors for cut wires, melted insulation, or corrosion.
    • Check the condition of connector pins (bent, broken, or dirty).
  2. Injector Testing:
    • Use a multimeter to measure the resistance of each injector (typically between 10 and 18 Ω).
    • Compare the values with Cadillac specifications.
  3. Electrical Circuit Check:
    • Test the continuity of the injector harness between the PCM and the injector.
    • Look for short circuits to ground or circuit interruptions.
  4. PCM Data Analysis:
    • Use an OBD-II scanner to observe real-time injector data.
    • Identify the specific injector causing the code.

Recommended Solutions

  1. Replace the Faulty Injector:
    • Choose a new or remanufactured injector that meets Cadillac standards.
    • Replace the seals to prevent leaks.
  2. Repair the Electrical Harness:
    • Repair or replace damaged wires using sealed solder joints.
    • Clean connectors with electrical contact spray.
  3. Reset the PCM:
    • Clear the P1200 code after repairs and test the vehicle to confirm resolution.
    • If the code reappears, consider reprogramming or replacing the PCM.

Important Precautions

  • Disconnect the battery before working on the electrical circuit to avoid short circuits.
  • Use precise diagnostic tools to avoid misinterpretation errors.

Estimated Costs

  • Fuel injector: €150 to €400 (depending on the model).
  • Labor: 1 to 3 hours (€80 to €250).

Conclusion

The P1200 code on a Cadillac often indicates an electrical or mechanical issue with the injectors. A thorough inspection of the circuit and related components usually resolves the problem. If the diagnosis is beyond your skills, consult a Cadillac specialist mechanic to avoid damaging other systems (such as the catalytic converter) due to an unbalanced air-fuel mixture.