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OBD II CSU

OBD II Research Center

P21B5

Technical Definition:

NOX Adsorber – Over Temperature (Bank 2)

Trouble Code: P21B5
Address: 0x21B5
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B5
  • OBD P21B5
  • OBD2 P21B5
  • P21B5 DTC
  • P21B5 OBD-II
  • Trouble Code P21B5
  • Leave a comment

P21B4

Technical Definition:

NOX Adsorber – Over Temperature (Bank 1)

Trouble Code: P21B4
Address: 0x21B4
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B4
  • OBD P21B4
  • OBD2 P21B4
  • P21B4 DTC
  • P21B4 OBD-II
  • Trouble Code P21B4
  • Leave a comment

P21B3

Technical Definition:

Closed Loop NOX Adsorber Control At Limit – Too High

Trouble Code: P21B3
Address: 0x21B3
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B3
  • OBD P21B3
  • OBD2 P21B3
  • P21B3 DTC
  • P21B3 OBD-II
  • Trouble Code P21B3
  • Leave a comment

P21B2

Technical Definition:

Excessive Time To Enter Closed Loop NOX Adsorber Control

Trouble Code: P21B2
Address: 0x21B2
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B2
  • OBD P21B2
  • OBD2 P21B2
  • P21B2 DTC
  • P21B2 OBD-II
  • Trouble Code P21B2
  • Leave a comment

P21B1

Technical Definition:

Reductant Level Sensor C Circuit Intermittent/Erratic

Trouble Code: P21B1
Address: 0x21B1
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B1
  • OBD P21B1
  • OBD2 P21B1
  • P21B1 DTC
  • P21B1 OBD-II
  • Trouble Code P21B1
  • Leave a comment

P21B0

Technical Definition:

Reductant Level Sensor C Circuit High

Trouble Code: P21B0
Address: 0x21B0
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B0
  • OBD P21B0
  • OBD2 P21B0
  • P21B0 DTC
  • P21B0 OBD-II
  • Trouble Code P21B0
  • Leave a comment

P21AF

Technical Definition:

Reductant Level Sensor C Circuit Low

Trouble Code: P21AF
Address: 0x21AF
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AF
  • OBD P21AF
  • OBD2 P21AF
  • P21AF DTC
  • P21AF OBD-II
  • Trouble Code P21AF
  • Leave a comment

P21AE

Technical Definition:

Reductant Level Sensor C Circuit Range/Performance

Trouble Code: P21AE
Address: 0x21AE
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AE
  • OBD P21AE
  • OBD2 P21AE
  • P21AE DTC
  • P21AE OBD-II
  • Trouble Code P21AE
  • Leave a comment

P21AD

Technical Definition:

Reductant Level Sensor C Circuit

Trouble Code: P21AD
Address: 0x21AD
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AD
  • OBD P21AD
  • OBD2 P21AD
  • P21AD DTC
  • P21AD OBD-II
  • Trouble Code P21AD
  • Leave a comment

P21AC

Technical Definition:

Reductant Level Sensor B Circuit Intermittent/Erratic

Trouble Code: P21AC
Address: 0x21AC
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AC
  • OBD P21AC
  • OBD2 P21AC
  • P21AC DTC
  • P21AC OBD-II
  • Trouble Code P21AC
  • Leave a comment

P21AB

Technical Definition:

Reductant Level Sensor B Circuit High

Trouble Code: P21AB
Address: 0x21AB
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AB
  • OBD P21AB
  • OBD2 P21AB
  • P21AB DTC
  • P21AB OBD-II
  • Trouble Code P21AB
  • Leave a comment

P21AA

Technical Definition:

Reductant Level Sensor B Circuit Low

Trouble Code: P21AA
Address: 0x21AA
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21AA
  • OBD P21AA
  • OBD2 P21AA
  • P21AA DTC
  • P21AA OBD-II
  • Trouble Code P21AA
  • Leave a comment

P21A9

Technical Definition:

Reductant Level Sensor B Circuit Range/Performance

Trouble Code: P21A9
Address: 0x21A9
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A9
  • OBD P21A9
  • OBD2 P21A9
  • P21A9 DTC
  • P21A9 OBD-II
  • Trouble Code P21A9
  • Leave a comment

P21A8

Technical Definition:

Reductant Level Sensor B Circuit

Trouble Code: P21A8
Address: 0x21A8
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A8
  • OBD P21A8
  • OBD2 P21A8
  • P21A8 DTC
  • P21A8 OBD-II
  • Trouble Code P21A8
  • Leave a comment

P21A7

Technical Definition:

Cylinder 12 Air-Fuel Ratio Imbalance

Trouble Code: P21A7
Address: 0x21A7
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A7
  • OBD P21A7
  • OBD2 P21A7
  • P21A7 DTC
  • P21A7 OBD-II
  • Trouble Code P21A7
  • Leave a comment

P21A6

Technical Definition:

Cylinder 11 Air-Fuel Ratio Imbalance

Trouble Code: P21A6
Address: 0x21A6
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A6
  • OBD P21A6
  • OBD2 P21A6
  • P21A6 DTC
  • P21A6 OBD-II
  • Trouble Code P21A6
  • Leave a comment

P21A5

Technical Definition:

Cylinder 10 Air-Fuel Ratio Imbalance

Trouble Code: P21A5
Address: 0x21A5
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A5
  • OBD P21A5
  • OBD2 P21A5
  • P21A5 DTC
  • P21A5 OBD-II
  • Trouble Code P21A5
  • Leave a comment

P21A4

Technical Definition:

Cylinder 9 Air-Fuel Ratio Imbalance

Trouble Code: P21A4
Address: 0x21A4
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A4
  • OBD P21A4
  • OBD2 P21A4
  • P21A4 DTC
  • P21A4 OBD-II
  • Trouble Code P21A4
  • Leave a comment

P21A3

Technical Definition:

Cylinder 8 Air-Fuel Ratio Imbalance

Trouble Code: P21A3
Address: 0x21A3
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A3
  • OBD P21A3
  • OBD2 P21A3
  • P21A3 DTC
  • P21A3 OBD-II
  • Trouble Code P21A3
  • Leave a comment

P21A2

Technical Definition:

Cylinder 7 Air-Fuel Ratio Imbalance

Trouble Code: P21A2
Address: 0x21A2
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21A2
  • OBD P21A2
  • OBD2 P21A2
  • P21A2 DTC
  • P21A2 OBD-II
  • Trouble Code P21A2
  • Leave a comment

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