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OBD II CSU

OBD II Research Center

P21C9

Technical Definition:

Reductant Control Module Power Relay/Relays Control Circuit High

Trouble Code: P21C9
Address: 0x21C9
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C9
  • OBD P21C9
  • OBD2 P21C9
  • P21C9 DTC
  • P21C9 OBD-II
  • Trouble Code P21C9
  • Leave a comment

P21C8

Technical Definition:

Reductant Control Module Power Relay/Relays Control Circuit Low

Trouble Code: P21C8
Address: 0x21C8
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C8
  • OBD P21C8
  • OBD2 P21C8
  • P21C8 DTC
  • P21C8 OBD-II
  • Trouble Code P21C8
  • Leave a comment

P21C7

Technical Definition:

Reductant Control Module Power Relay/Relays Control Circuit/Open

Trouble Code: P21C7
Address: 0x21C7
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C7
  • OBD P21C7
  • OBD2 P21C7
  • P21C7 DTC
  • P21C7 OBD-II
  • Trouble Code P21C7
  • Leave a comment

P21C6

Technical Definition:

Reductant Level Sensor B Stuck

Trouble Code: P21C6
Address: 0x21C6
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C6
  • OBD P21C6
  • OBD2 P21C6
  • P21C6 DTC
  • P21C6 OBD-II
  • Trouble Code P21C6
  • Leave a comment

P21C5

Technical Definition:

Reductant Level Sensor A Stuck

Trouble Code: P21C5
Address: 0x21C5
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C5
  • OBD P21C5
  • OBD2 P21C5
  • P21C5 DTC
  • P21C5 OBD-II
  • Trouble Code P21C5
  • Leave a comment

P21C4

Technical Definition:

Reductant Heater Relay Control Circuit High

Trouble Code: P21C4
Address: 0x21C4
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C4
  • OBD P21C4
  • OBD2 P21C4
  • P21C4 DTC
  • P21C4 OBD-II
  • Trouble Code P21C4
  • Leave a comment

P21C3

Technical Definition:

Reductant Heater Relay Control Circuit Low

Trouble Code: P21C3
Address: 0x21C3
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C3
  • OBD P21C3
  • OBD2 P21C3
  • P21C3 DTC
  • P21C3 OBD-II
  • Trouble Code P21C3
  • Leave a comment

P21C2

Technical Definition:

Reductant Heater Relay Control Circuit Open

Trouble Code: P21C2
Address: 0x21C2
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C2
  • OBD P21C2
  • OBD2 P21C2
  • P21C2 DTC
  • P21C2 OBD-II
  • Trouble Code P21C2
  • Leave a comment

P21C1

Technical Definition:

Cold Start Cylinder 12 Injection Timing

Trouble Code: P21C1
Address: 0x21C1
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C1
  • OBD P21C1
  • OBD2 P21C1
  • P21C1 DTC
  • P21C1 OBD-II
  • Trouble Code P21C1
  • Leave a comment

P21C0

Technical Definition:

Cold Start Cylinder 11 Injection Timing

Trouble Code: P21C0
Address: 0x21C0
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21C0
  • OBD P21C0
  • OBD2 P21C0
  • P21C0 DTC
  • P21C0 OBD-II
  • Trouble Code P21C0
  • Leave a comment

P21BF

Technical Definition:

Cold Start Cylinder 10 Injection Timing

Trouble Code: P21BF
Address: 0x21BF
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BF
  • OBD P21BF
  • OBD2 P21BF
  • P21BF DTC
  • P21BF OBD-II
  • Trouble Code P21BF
  • Leave a comment

P21BE

Technical Definition:

Cold Start Cylinder 9 Injection Timing

Trouble Code: P21BE
Address: 0x21BE
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BE
  • OBD P21BE
  • OBD2 P21BE
  • P21BE DTC
  • P21BE OBD-II
  • Trouble Code P21BE
  • Leave a comment

P21BD

Technical Definition:

Cold Start Cylinder 8 Injection Timing

Trouble Code: P21BD
Address: 0x21BD
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BD
  • OBD P21BD
  • OBD2 P21BD
  • P21BD DTC
  • P21BD OBD-II
  • Trouble Code P21BD
  • Leave a comment

P21BC

Technical Definition:

Cold Start Cylinder 7 Injection Timing

Trouble Code: P21BC
Address: 0x21BC
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BC
  • OBD P21BC
  • OBD2 P21BC
  • P21BC DTC
  • P21BC OBD-II
  • Trouble Code P21BC
  • Leave a comment

P21BB

Technical Definition:

Cold Start Cylinder 6 Injection Timing

Trouble Code: P21BB
Address: 0x21BB
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BB
  • OBD P21BB
  • OBD2 P21BB
  • P21BB DTC
  • P21BB OBD-II
  • Trouble Code P21BB
  • Leave a comment

P21BA

Technical Definition:

Cold Start Cylinder 5 Injection Timing

Trouble Code: P21BA
Address: 0x21BA
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21BA
  • OBD P21BA
  • OBD2 P21BA
  • P21BA DTC
  • P21BA OBD-II
  • Trouble Code P21BA
  • Leave a comment

P21B9

Technical Definition:

Cold Start Cylinder 4 Injection Timing

Trouble Code: P21B9
Address: 0x21B9
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B9
  • OBD P21B9
  • OBD2 P21B9
  • P21B9 DTC
  • P21B9 OBD-II
  • Trouble Code P21B9
  • Leave a comment

P21B8

Technical Definition:

Cold Start Cylinder 3 Injection Timing

Trouble Code: P21B8
Address: 0x21B8
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B8
  • OBD P21B8
  • OBD2 P21B8
  • P21B8 DTC
  • P21B8 OBD-II
  • Trouble Code P21B8
  • Leave a comment

P21B7

Technical Definition:

Cold Start Cylinder 2 Injection Timing

Trouble Code: P21B7
Address: 0x21B7
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B7
  • OBD P21B7
  • OBD2 P21B7
  • P21B7 DTC
  • P21B7 OBD-II
  • Trouble Code P21B7
  • Leave a comment

P21B6

Technical Definition:

Cold Start Cylinder 1 Injection Timing

Trouble Code: P21B6
Address: 0x21B6
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

Specific Makes:

  • Error P21B6
  • OBD P21B6
  • OBD2 P21B6
  • P21B6 DTC
  • P21B6 OBD-II
  • Trouble Code P21B6
  • Leave a comment

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