THE CODE DIRECTORY

Diagnostic code references — Page 74.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

Generic OBD-II

P2188

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

System Too Rich at Idle Bank 1

System Too Lean at Idle Bank 2

Throttle Actuator B Control System - Idle Position Not Learned

Throttle/Fuel Inhibit B Circuit

Throttle/Fuel Inhibit B Circuit Range/Performance

Throttle/Fuel Inhibit B Circuit Low

Throttle/Fuel Inhibit B Circuit High

Reductant No Flow Detected

System Too Rich at Idle Bank 2

System Too Lean at Higher Load Bank 1

System Too Rich at Higher Load Bank 1

System Too Lean at Higher Load Bank 2

System Too Rich at Higher Load Bank 2

O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1

O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1

O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 1

O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1

Intake Air Temperature Sensor 1/2 Correlation

Bank 1 Air-Fuel Ratio Imbalance

Bank 2 Air-Fuel Ratio Imbalance

Cylinder 1 Air-Fuel Ratio Imbalance

Cylinder 2 Air-Fuel Ratio Imbalance

Cylinder 3 Air-Fuel Ratio Imbalance

Cylinder 4 Air-Fuel Ratio Imbalance

Cylinder 5 Air-Fuel Ratio Imbalance

Cylinder 6 Air-Fuel Ratio Imbalance

Cylinder 7 Air-Fuel Ratio Imbalance

Cylinder 8 Air-Fuel Ratio Imbalance

Cylinder 9 Air-Fuel Ratio Imbalance

Cylinder 10 Air-Fuel Ratio Imbalance

Cylinder 11 Air-Fuel Ratio Imbalance

Cylinder 12 Air-Fuel Ratio Imbalance

Reductant Level Sensor B Circuit

Reductant Level Sensor B Circuit Range/Performance

Reductant Level Sensor B Circuit Low

Reductant Level Sensor B Circuit High

Reductant Level Sensor B Circuit Intermittent/Erratic

Reductant Level Sensor C Circuit

Reductant Level Sensor C Circuit Range/Performance

Reductant Level Sensor C Circuit Low

Reductant Level Sensor C Circuit High

Reductant Level Sensor C Circuit Intermittent/Erratic

Excessive Time To Enter Closed Loop NOx Adsorber Control

Closed Loop NOx Adsorber Control At Limit - Too High

NOx Adsorber - Over Temperature Bank 1

NOx Adsorber - Over Temperature Bank 2

Cold Start Cylinder 1 Injection Timing

Cold Start Cylinder 2 Injection Timing

Cold Start Cylinder 3 Injection Timing

Cold Start Cylinder 4 Injection Timing

Cold Start Cylinder 5 Injection Timing

Cold Start Cylinder 6 Injection Timing

Cold Start Cylinder 7 Injection Timing

Cold Start Cylinder 8 Injection Timing

Cold Start Cylinder 9 Injection Timing

Cold Start Cylinder 10 Injection Timing

Cold Start Cylinder 11 Injection Timing

Cold Start Cylinder 12 Injection Timing

Reductant Heater Relay Control Circuit/Open

Reductant Heater Relay Control Circuit Low

Reductant Heater Relay Control Circuit High

Reductant Level Sensor A Stuck

Reductant Level Sensor B Stuck

Reductant Control Module Power Relay/Relays Control Circuit/Open

Reductant Control Module Power Relay/Relays Control Circuit Low

Reductant Control Module Power Relay/Relays Control Circuit High

Reductant Control Module Supply Voltage Circuit

Reductant Control Module Supply Voltage Low

Reductant Control Module Supply Voltage High

Reductant Quality Module Supply Voltage Low

Reductant Quality Module Performance

Cylinder 1 Injector B Circuit/Open

Cylinder 2 Injector B Circuit/Open

Cylinder 3 Injector B Circuit/Open

Cylinder 4 Injector B Circuit/Open

Cylinder 5 Injector B Circuit/Open

Cylinder 6 Injector B Circuit/Open

Cylinder 7 Injector B Circuit/Open

Cylinder 8 Injector B Circuit/Open

Cylinder 9 Injector B Circuit/Open