P0171 · Manufacturer communications

JEEP · 2026-03-12

Not applicable to vehicles built for US market. Methanol In Fuel - Diagnostic Trouble Code (DTC) P0171 Customers may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may SYMPTOM: exhibit/set the following Diagnostic Trouble Code (DTC): ● P0171-00 - System Too Lean (Bank 1). Customers can also experience one or more of the following: ● Engine misfire. ● Rough engine idle. ● Difficulty starting engine. . No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.

JEEP · 2025-10-01

Not applicable to vehicles built for US market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software

JEEP · 2025-10-01

Not applicable to vehicles built for US market. Flash: Powertrain Control Module (PCM) Updates *Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software

JEEP · 2025-09-23

Not applicable to vehicles built for US market. Flash: Powertrain Control Module (PCM) Updates ustomers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP, RAM · 2025-08-22

Disconnected Purge Line Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0300-00 - Multiple Cylinder Misfire. ● P0171-00 - System Too Lean Bank 1. ● P0174-00 - Fuel System 2/1 Lean. Customers may also experience one or more of the following: ● Vehicle running rough. ● Hissing noise from the engine. ● Vehicle does not start. This bulletin involves replacing the purge hose and canister purge tube.

FORD · 2025-07-25

This article supersedes TSB 23-2195 to update the labor times from M-time to fixed time. Some of the vehicles listed in the Model statement above may exhibit an illuminated MIL in the instrument panel cluster (IPC) with DTC P0171 stored in the powertrain control module (PCM). This may be due to the software level of the PCM.

JEEP · 2025-07-19

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle mustexhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P04B5 - Fuel Fill Door Stuck Open. ● P1D83 - Implausible Engine Oil Temperature Signal Received.** ● P2450 - Fuel Tank Isolation Valve Stuck Open. ● P0032 - O2 Sensor 1/1 Heater Circuit High. ● P2097 - Downstream Fuel Trim System 1 Rich. ● P0171 - Fuel System 1/1 Lean. ● P0300 - Multiple Cylinder Misfire. ● P06E4 - Control Module Wake-Up Circuit Performance. ● B12B4 - Charge Status Indicator Module Internal. ● P061B - Internal Control Module Torque Calculation Performance. ● P0810 - Clutch Position Control Error. ● P2885 - Engine Disconnect Clutch Engagement Fault.…

JEEP · 2025-07-16

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP · 2025-07-16

NOTE: Does not apply to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP · 2025-07-16

NOTE: Does not apply to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP · 2025-07-16

NOTE: Does not apply to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP · 2025-07-16

NOTE: Does not apply to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves possibly replacing the upstream oxygen sensor and reprogramming the PCM with the latest available software.

JEEP · 2025-07-04

NOTE: Not applicable to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves reprogramming the PCM with the latest available software and possibly replacing the upstream oxygen sensor

JEEP · 2025-07-04

NOTE: Not applicable to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times This bulletin involves reprogramming the PCM with the latest available software and possibly replacing the upstream oxygen sensor. This bulletin involves reprogramming the PCM with the latest available software…

JEEP · 2025-07-04

NOTE: Not applicable to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves reprogramming the PCM with the latest available software and possibly replacing the upstream oxygen sensor. This bulletin involves reprogramming the PCM with the latest available software…

JEEP · 2025-07-04

NOTE: Not applicable to vehicles built for US Market. Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032-00 - Comando Do Aquecedor De Sonda Lambda Pré-catalisador - Circuito Alto. ● P0133-00 - Sonda Lambda Pré-catalisador - Resposta Lenta. ● P0171-00 - Sonda Lambda Pré-catalisador - Mistura Pobre. Customers may comment on one or more of the following: ● Engine power loss. ● Engine acceleration cuts out at times. This bulletin involves reprogramming the PCM with the latest available software and possibly replacing the upstream oxygen sensor.

JEEP · 2025-06-25

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● U0168 - Lost Communication With Vehicle Security Control Module. ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may also experience one or more of the following: ● Vehicle not starting. ● Variable speed fuel pump doesn't start after refueling. ● The Instrument Panel Cluster (IPC) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering Electric Vehicle (EV) mode. False fault detection…

JEEP · 2025-05-24

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● **P2450 - Fuel Tank Isolation Valve Stuck Open.** ● P0032 - O2 Sensor 1/1 Heater Circuit High. ● P2097 - Downstream Fuel Trim System 1 Rich. ● P0171 - Fuel System 1/1 Lean. ● P0300 - Multiple Cylinder Misfire. ● P06E4 - Control Module Wake-Up Circuit Performance. ● B12B4 - Charge Status Indicator Module Internal. ● P061B - Internal Control Module Torque Calculation Performance. ● P0810 - Clutch Position Control Error. ● P2885 - Engine Disconnect Clutch Engagement Fault. Customers may also experience one or more of the following: ● **""Service Hybrid System"" message…

JEEP · 2025-05-18

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low – Bank 1. ● P16F0-00 - SPI Comm Hardware Fault. Customers may also experience one or more of the following: ● **Engine No Start.** ● The rear shafts can be damaged from pressing the accelerator while in gear with the Electronic Parking Brake (EPB) applied. ● Oxygen sensors can give wrong values entering EV mode. False fault detection is possible. ● The Instrument Panel Cluster (IPC) is unable to calculate the instantaneous fuel economy when under heavy acceleration. ●…

JEEP · 2025-04-30

"Flash: Powertrain Control Module (PCM) Updates. Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● **U0168 - Lost Communication With Vehicle Security Control Module.** ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may also experience one or more of the following: ● **Vehicle not starting.** ● Variable speed fuel pump doesn't start after refueling. ● The Instrument Panel Cluster (IPC) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering Electric Vehicle (EV) mode. False fault…

JEEP · 2025-03-28

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTC)s have been set: ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may also experience one or more of the following: ● Variable speed fuel pump doesn't start after refueling. ● The Instrument Panel Cluster (IPC) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering Electric Vehicle (EV) mode. False fault detection is possible when this event occurs. ● The rear half shafts are damaged due to…

MERCEDES-BENZ · 2025-03-07

Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy -Check engine control unit N3/10 for software update. -Proceed with software update if new software version 2549032303, 2549032403, 2549032503 or 2549032603 are found. -Clear faults and check for any symptoms on road test **Do not replace hardware unless clear part malfunction is determined**

MERCEDES-BENZ · 2025-02-28

Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy C300, CLE300, E350, GLC300 and GLE350 -Check engine control unit N3/10 for software update. -Proceed with software update if new software version 2549032303, 2549032403, 2549032503 or 2549032603 are found. -Clear faults and check for any symptoms on road test early 2024 GLE350 Check if symptom can be…

MERCEDES-BENZ · 2025-01-24

Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy C300, CLE300, E350, Model year 2024-2025 GLC300 and GLE350 -Check engine control unit N3/10 for software update. -Proceed with software update if versions 2549032303, 2549032403, 2549032503 or 2549032603 are found. -Clear faults and check for any symptoms on road test 2023 GLC300 and early 2024 GLE350…

MERCEDES-BENZ · 2025-01-18

Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy Model year 2024-2025 GLC300 and GLE350 -Check engine control unit N3/10 for software update. -Proceed with software update if versions 2549032503 or 2549032603 are found. -Clear faults and check for any symptoms on road test For all other models or if software is not found in above steps Check if…

MERCEDES-BENZ · 2024-11-02

Complaint Check engine light on. Engine in limp-home mode. Rough running. Low fuel rail pressure fault code P008700 stored in MRG2 control unit. Additional faults below may be stored in MRG2 control unit: Misfire- P030000, P030100, P030200, P030300, P030400, P030084, P030004 Mixture adaptation- P217800 P218762, P017100, P017200, P217700 Injector malfunction- P02EE00, P02EF00, P02F000, P02F100, P214601, P214901 Cause Gas bubbles forming in low pressure fuel system due to fuel boiling. Remedy Check if symptom can be reproduced during normal drive cycle. -If reproducible, diagnose the cause of low pressure in fuel system. -If not reproducible, drain and refill fuel tank with top tier premium gasoline. Clear faults and check vehicle operation. Software solution is in development to prevent…

JEEP · 2024-10-23

"Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) has been set: ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may experience one or more of the following: ● Vehicle will not start. ● The Instrument Cluster Panel (ICP) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering EV mode. False fault detection (MIL on) is possible when this event occurs. ● The rear half shafts are damaged due to accelerating in drive with the Electronic Parking Brake (EPB)…

JEEP · 2024-09-14

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTC)s have been set: ● P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1. Customers may also experience the following: ● Vehicle will not start. ● The Instrument Cluster Panel (ICP) unable to calculate the instantaneous fuel economy under heavy acceleration. ● The oxygen sensor can give incorrect values when entering EV mode. False fault detection (MIL on) is possible when this event occurs. ● The rear half shafts are damaged due to accelerating in drive with the Electronic Parking Brake (EPB)…

JEEP · 2024-09-07

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ● **P0629 - Fuel Pump Control Circuit High. ● P0171 - Fuel system Lean. ● P0087 - Fuel Rail Pressure Too Low - Bank 1.** ● P16F0-00 - SPI Comm Hardware Fault. Customers may also experience one or more of the following: ● **The rear half shafts are damaged due to pressing the accelerator in drive with the Electric Parking Brake (EPB) applied. ● The Oxygen Sensor (02) can give wrong values when entering EV mode, triggering a false MIL. ● The Instrument Cluster Panel (ICP) unable to calculate the instantaneous fuel economy under heavy…

JEEP · 2024-06-20

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0032 - O2 Sensor 1/1 Heater Circuit High. ● P2097 - Downstream Fuel Trim System 1 Rich. ● P0171 - Fuel System 1/1 Lean. ● P0300 - Multiple Cylinder Misfire. ● P06E4 - Control Module Wake-Up Circuit Performance. ● B12B4 - Charge Status Indicator Module Internal. ● P061B - Internal Control Module Torque Calculation Performance. ● P0810 - Clutch Position Control Error. ● P2885 - Engine Disconnect Clutch Engagement Fault. Customers may also experience one or more of the following: ● Vehicle misfires. ● Low speed engine stall at idle. ● Difficulty shifting out of 4LO. ● Idle…