2025 Jeep Compass MIL and Engine Performance TSB

Symptoms of PCM Software Issues

Owners of certain 2025 Jeep Compass vehicles may notice a "Malfunction Indicator Lamp (MIL) illumination" on their dashboard. This warning light often accompanies other performance problems. Customers might also report "Engine power loss" or that "Engine acceleration cuts out at times." These symptoms can indicate an underlying issue with the Powertrain Control Module (PCM) software.

Associated Fault Codes (DTCs)

When the "Malfunction Indicator Lamp (MIL) illumination" occurs, a scan tool may reveal one or more of the following Diagnostic Trouble Codes (DTCs):

Code	Description
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

These codes specifically point to issues with the upstream lambda (oxygen) sensor and the fuel mixture, which are managed by the PCM.

Diagnosis and Trigger Conditions

This Technical Service Bulletin (TSB) 18-043-25 REV. A applies to 2025 Jeep Compass vehicles equipped with the 1.3L I4 Turbo Mair DI Eng W/ESS (Sales Code EYJ), built between September 23, 2024, and June 12, 2025. This bulletin is specifically for the South America market. The focus keyword for this issue is "2025 Jeep Compass PCM updates."

Technicians will first verify if the vehicle's VIN is included in the Rapid Service Update (RSU) 25-125 list. If DTCs P0032-00, P0133-00, or P0171-00 are present, or if the vehicle exhibits "Engine power loss" or "Engine acceleration cuts out at times" without DTCs, further diagnosis is required. For vehicles without DTCs, a warm-up cycle and an acceleration test at 2,500 rpm will be performed to check for unintentional oscillation in the rpm needle or engine sound frequency.

Repair Procedure Summary

The repair for the 2025 Jeep Compass PCM updates involves a multi-step process. First, technicians must ensure the vehicle's battery voltage is maintained between 13.2 and 13.5 volts using a battery charger during the entire flash process. If the flash is interrupted, it must be restarted.

1. VIN Verification: Check if the vehicle is on the RSU VIN list. If not, the bulletin does not apply.
2. DTC Check: Determine if DTCs P0032-00, P0133-00, or P0171-00 are present.
3. Performance Test (if no DTCs): If no DTCs are found, the vehicle undergoes a warm-up cycle. The technician then maintains 2,500 rpm and checks for visible unintentional oscillation in the rpm needle or engine sound.
4. Oxygen Sensor Replacement: If the specific DTCs (P0032-00, P0133-00, P0171-00) are present, or if unintentional rpm oscillation is observed, the upstream oxygen sensor may need replacement. Detailed procedures for this are available in DealerCONNECT/Service Library under 1080B94.
5. PCM Reprogramming: The Powertrain Control Module (PCM) is reprogrammed with the latest available software. This step is crucial for resolving the underlying software issues causing the "Malfunction Indicator Lamp (MIL) illumination" and "Engine power loss." This service action is identified by TSB 18-043-25 REV. A.
6. DTC Clearance: After reprogramming, all Diagnostic Trouble Codes (DTCs) that may have been set in any module are cleared using the wiTECH application.

This bulletin supersedes Technical Service Bulletin (TSB) 18-043-25, dated July 04, 2025. It has also been released as Rapid Service Update (RSU) 25-125.

Required Tools or Parts

To perform the necessary repairs, technicians will utilize the following:

• wiTECH: A diagnostic scan tool used for verifying system functionality, checking DTCs, and reprogramming the PCM.
• Oxygen Sensor: If replacement is necessary, the upstream oxygen sensor (Sonda Lambda Upstream) will be used. Relevant part numbers include 7099048-SA and 68755193AA-EMEA.

Important Warnings for Owners and Technicians

This bulletin includes critical information regarding the repair process and applicability:

• Market Applicability: This bulletin explicitly states, "NOTE: This bulletin applies to the South America market." It does not apply to vehicles built for the US market.
• Battery Voltage During Flash: "NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process." Maintaining stable voltage is crucial to prevent module damage during reprogramming.
• Interrupted Flash: "NOTE: If this flash process is interrupted/aborted, the flash should be restarted."
• Failure Codes: Dealers must choose the correct failure code (RF for RSU, CC for TSB) when claiming warranty work. The "RF" code is specifically for essential module flash/reprogramming on RSU-listed VINs.

Owner Action

If your 2025 Jeep Compass is experiencing a "Malfunction Indicator Lamp (MIL) illumination," "Engine power loss," or "Engine acceleration cuts out at times," especially if you are in the South America market, it is recommended to contact your authorized Jeep dealership. Mention Technical Service Bulletin 18-043-25 REV. A or Rapid Service Update (RSU) 25-125. Repairs are reimbursable under warranty provisions.

---

Source: NHTSA ID: 11020833