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.

Model documentation

Only models identified by the cited manufacturer material are listed.

Renegade

2016; 2019 (separate engine cases)

Grand Cherokee

2023

Jeep diagnostic guides

2019 Jeep Renegade P0456: test for a leak before the software update

2023 Jeep Grand Cherokee P0456: prove a filler-tube leak before replacement

Open Or Shorted Condition Detected In The Baro Read Solenoid Control Circuit

Inlet Air Temp. Circuit Low

Inlet Air Temp. Circuit High

Incorrect Or Irrational Performance Has Been Detected For The PWM

O2 Sensor 1/1 (Bank 1 Sensor 1) Slow During Catalyst Monitor

O2 Sensor 2/1 (Bank 2 Sensor 1) Slow During Catalyst Monitor

O2 Sensor 1/2 (Bank 1 Sensor 2) Slow During Catalyst Monitor

Radiator Temperature Sensor Voltage Too High

Radiator Temperature Sensor Voltage Too Low

Open Or Shorted Condition Detected In The Turbocharger Surge Valve Solenoid Control

Open Or Shorted Condition Detected In The Fuel System Relay Control Circuit

Engine Operating Temp Below Acceptable Range

Fuel Pump Relay Control Circuit Open Or Shorted

Idle Select Signal Invalid

Fuel Injection Pump Battery Voltage Out Of Range

Fuel Injection Pump Controller Always On

Accelerator Pedal Position Sensor Supply Voltage Too High

Fuel Injection Pump Controller Supply Voltage Low

Intake Manifold Short Runner Solenoid Circuit Open Or Shorted

Manifold Tune Valve Solenoid Circuit Open Or Shorted

CNG Fuel Pressure Too High

No Temp Rise Seen From Fuel Heaters

CNG Pressure Sensor Voltage Too High

CNG Pressure Sensor Voltage Too Low

Target Idle Not Reached

Loss Of 5 Volts To TP Sensor

Loss Of 5 Volts To MAP Sensor

No Change In MAP From Start To Run

Lean Operation At Wide Open Throttle

Vacuum Leak Found (IAC Fully Seated)

Auto Shutdown (ASD) Relay Control Circuit Open Or Shorted

No Auto Shutdown (ASD) Relay Output Voltage At PCM

Timing Belt Skipped One Tooth Or More

Intermittent Loss of CMP Or CKP

PCM Is Unable To Learn The Crankshaft Position Sensor's Signal

Wait To Start Lamp Circuit Open Or Shorted

Loss Of 5 Volts To EGR Sensor

Auxiliary 5 Volt Output Too High

Too Little Secondary Air

Too Much Secondary Air

Battery Temp Sensor Voltage Out Of Limit

Transmission Fan Relay Circuit Open Or Shorted

EATX RPM Pulse Generator Signal For Misfire Detection

Catalyst Temperature Sensor Circuit Shorted Low

Catalyst Temperature Sensor Circuit Shorted High

Catalytic Converter Overheat Detected

Air Injection Solenoid Circuit Open Or Shorted

Evap Leak Monitor Pinched Hose

Hi Speed Rad Fan CTRL Relay Circuit Open Or Shorted

Auxiliary 5 Volt Supply Output Too Low

High Speed Fan CTRL Relay Circuit Open Or Shorted

Low Speed Fan CTRL Relay Circuit Open Or Shorted

Radiator Fan Control Relay Circuit Open Or Shorted

Battery Temperature Sensor Voltage Too High

Battery Temperature Sensor Voltage Too Low

Leak Detection Pump Switch Or Mechanical Fault

Leak Detection Pump Solenoid Circuit Open Or Shorted

5 Volt Supply Output Too Low

High Speed Rad Fan Ground CTRL Rly Circuit

Open Or Shorted Condition Detected In The Hydraulic Cooling Fan Solenoid Control

Charging System Voltage Too High

Speed Control Solenoid Circuit Open Or Shorted

Speed Control Switch Always High

Speed Control Switch Always Low

A/C Pressure Sensor Voltage Too High

A/C Pressure Sensor Voltage Too Low

PCM Not Programmed

Clutch Released Switch Circuit Open Or Shorted

No Instrument Panel Cluster CCD/J1850 Messages Received

Charging System Voltage Too Low

Speed Control Power Relay Or Speed Control 12 Volt Driver Circuit Open Or Shorted

Battery Disconnected Within Last 50 Starts

Skim Invalid Key

No SKIM Bus Message Received

No Cluster Bus Message

Internal Fuel Injection Pump Controller Failure

No Communication Between ECM & Injection Pump Module