Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSDODGE AND RAM2024PROMASTER 1500 SLT+REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM3.6L - DTCS P0141 TO P0171DTC TROUBLESHOOTINGP0157 O2 SENSOR 2/2 CIRCUIT LOWDIAGNOSTIC TEST

2024 Dodge and Ram ProMaster 1500 SLT+

Diagnostic Test

2024 Dodge and Ram ProMaster 1500 SLT+SECTION Diagnostic Test

CHECK FOR ANY SERVICE BULLETINS OR PCM SOFTWARE UPDATES
1. Check for any applicable Service Bulletins or Flash updates related to the DTC.
  Are there any applicable Service Bulletins or Flash updates?
  
  Yes
  - Perform the applicable repair.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 2
READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the O2 Sensor 2/2 harness connector.
3. Disconnect the PCM C2 harness connector.
4. Check for continuity between ground and the (K243) O2 Sensor 2/2 Signal circuit at the O2 Sensor 2/2 harness connector.
  Is there continuity between ground and the (K243) O2 Sensor 2/2 Signal circuit?
  
  Yes
  - Repair the (K243) O2 Sensor 2/2 Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK FOR THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT SHORTED TO THE O2 SENSOR 2/2 (Z916) GROUND CIRCUIT
1. Check for continuity between the (K243) O2 Sensor 2/2 Signal circuit and the O2 Sensor 2/2 (Z916) Ground circuit in the O2 Sensor 2/2 harness connector.
  Is there continuity between the (K243) O2 Sensor 2/2 Signal circuit and the O2 Sensor 2/2 (Z916) Ground circuit?
  
  Yes
  - Repair the short between the (K243) O2 Sensor 2/2 Signal circuit and the O2 Sensor 2/2 (Z916) ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (K243) O2 SENSOR 2/2 SIGNAL CIRCUIT FOR PROPER VOLTAGE AT THE O2 SENSOR HARNESS CONNECTOR
1. Turn the ignition off.
2. Connect the PCM C2 harness connector.
3. Start the engine and allow it to idle.
4. With the scan tool, read the O2 Sensor 2/2 Signal voltage.
  Is the O2 Sensor 2/2 voltage above 4.0 volts?
  
  Yes
  - Replace the O2 Sensor 2/2 in accordance with the Service Information. Refer to O2 SENSOR - UPSTREAM or O2 SENSOR - DOWNSTREAM .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.